EP2529163A2

EP2529163A2 - System and method for tapping geothermal energy from two or more reservoirs

Info

Publication number: EP2529163A2
Application number: EP11701515A
Authority: EP
Inventors: Angelo Piasentin
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-01-29
Filing date: 2011-01-31
Publication date: 2012-12-05
Also published as: WO2011092335A3; WO2011092335A2; DE102010006141A1

Abstract

The invention relates to a system (1; 2; 3; 4; 100-100'''; 200; 300; 400; 500; 600) for tapping or producing geothermal energy comprising: a first subterranean, usable area (10; 110; 210; 310; 410; 510; 610) having geothermal energy, a predetermined first tapping site (40; 140; 240; 340; 440; 540; 640) associated with the first usable area, and a first fluid connecting line (42; 142; 242; 342; 442; 542; 642) for tapping energy in accordance with said association, said line being designed between the first tapping site and the first usable region. According to the invention, at least one second (20; 120; 220; 320; 420; 520; 620) or other (30; 130; 230; 330; 430; 630-1, 630-2) subterranean, usable region having geothermal energy, and a first fluid connecting line (44; 144; 244; 344; 444; 544; 644) for tapping energy not in accordance with the association are provided between the first tapping site and the second usable region.

Description

System and method for generating geothermal energy

from two or more reservoirs

Description

The present invention relates to systems and methods for the generation of geothermal energy.

Corresponding systems are known per se and generally include one

subterranean, useable geothermal energy area, a first earth surface accession site associated with the useable area, a first fluid communication line emanating from the access site and descending to the useable area, one of the usable area in depth outgoing, leading up to the development site second fluid connection line, and one at the

Development site arranged heat exchange device. The first fluid communication line serves as an injection line, i. in it, a heat exchange fluid is conveyed from the earth's surface into the depth and into the usable area. The second fluid communication line serves as a production line, i. in her a heat exchange fluid from the usable area is promoted to the earth's surface and in the heat exchange device. Suitable usable areas are located at a depth of about 1,000 meters to 5,000 meters, although in certain geological formations (e.g., Lanzarote or Australia) or further below

Earth's surface. Due to the increasing temperature with increasing depth (average gradient about 3 ° C. per 100 meters), temperatures in the range from 80 ° C. to 180 ° C., preferably from 100 ° C. to 180 ° C., are present at these depths. In individual cases, projects from about 300 m depth and there already over 180 ° C can be considered. Due to the depths and prevailing temperatures mentioned herein, the geothermal energy referred to herein, also referred to as deep geothermal energy, is delimited and generally differs from shallow geothermal energy in terms of the exploration, drilling, tubing, pumping and power plant technologies used Formations at depths of several tens of meters to about 300 meters, where temperatures of about 5 ° C to about 15 ° C can prevail.

The heat exchange device has a fluid inlet at which the second

is connected according to the ordinal opening of the fluid connection line, and a fluid outlet, to which the first associate opening fluid connection line is connected to. The first associatively opening fluid connection line, the usable area, the second associatively opening fluid connection line and the heat exchange device form a substantially closed loop system for a circulating in it from heat exchange fluid. The heat exchange fluid, usually water, is circulated by suitable pumps in the circulatory system, such as by means of an injection pump located at the beginning of the first fluid communication line (injection line) and a subsea pump located near the bottom of the second fluid communication line (production line). downhole pump). Therefore, the first associatively opening fluid connection line is also referred to as injection line and the second fluid connection line opening according to the order as production line. Depending on the hydraulic requirements of the system, underwater pumps can also be used at different positions of the injection line.

In the circulatory system, the heat exchange fluid is thus pushed into the injection line and reaches the depth, flows through the permeable usable area, comes into heat transfer contact with the hot permeable geological formation and absorbs heat energy accordingly. Subsequently, the heated heat exchange fluid flows upwards through the production line and transports the water absorbed in the usable area

Heat energy to the heat exchange device. When displaced at the surface of the earth, the heat exchange fluid has a temperature in the range of about 50 ° C to 65 ° C. Around

To avoid heat loss, the upper sections of the injection and

Production lines (where the surrounding formations are still at a lower temperature than the heat exchange fluid) are thermally insulated to reduce heat losses into the formations surrounding these sections.

The heat exchange device withdraws thermal energy from the heat exchange fluid flowing around in the circulatory system and provides part of the energy thus obtained in a suitable form for energy consumption. The heat exchange device can operate as a power plant or a cogeneration plant to provide energy recovered in the form of electrical energy or in the form of heat energy, which is fed, for example, in a district heating network. Power plants currently operating in geothermal power can deliver power in the range of about 1 to about 5 megawatts and require an inflow of heat exchange fluid (water) from the production line of at least about 60 to about 100 liters per second (or more) at one Temperature near the boiling point of the water from about 80 to about 160 ° C (or more).

A development site, the heat exchange facility and the geothermal area accessible from there usually belong to a community. Another, approximately neighboring community has another own development site, another own heat exchange facility and a further developed geothermal area from there.

The document WO 98/22760 discloses such a system in which the

Injection line and the production line in depth by several Heat absorption lines are described. The heat-absorbing conduits each have a length of several kilometers and a diameter of the order of 10 centimeters, and are at least about 30 to 50 meters apart. In the transition region from the heat absorption lines to the production line, the geological formation is fractured by hydraulically induced cracking because it is difficult to accurately hit the production line when drilling the heat absorption pipes in depth.

The technologies of drilling, drilling wells and pumps used in the aforementioned deep geothermal energy are state-of-the-art, which has been developed in part in the oil and gas extraction industry. The power plant technologies used are also state-of-the-art.

Given the limited resources of hydrocarbons (petroleum and natural gas), technological advances, and increasing global energy demand, deep geothermal energy has the task of providing systems and processes for the generation or production of geothermal energy (Heat) energy efficiency and production periods in promoting

Heat energy are significantly larger than in the currently known systems and methods.

As claimed in a first aspect, there is provided a system for generating geothermal energy. The system includes a first subterranean, useable area of geothermal energy, a predetermined first one

Development site, which is associated with the first usable area, and a first associate opening fluid communication line between the first

Development site and the first usable area is formed.

According to the invention, the system further comprises at least one second or more subterranean usable areas of geothermal energy and a first non-improperly opening fluid communication line extending between the first

Development site and the second usable area is formed.

Under a development site is here understood to be a location at the earth's surface, in which at least one Bohranfangspunkt (in the English

Spud points) from which a bore leading into a usable area has been led down, the bore has subsequently been cased and in this way a fluid connection line between the development site and the usable area has been produced.

In an alternative definition of the term according to the present invention, a development site may be understood to mean a site located at the surface of the earth, from which a fluid communication line extends into a usable area Geothermal energy extends and a fluid communication between the usable area and the location on the earth's surface is made possible.

Through the fluid communication line extending from a usable area to a development site, a relationship is established between the useable area and the development site, which is referred to herein as the inaugural connection. It is now assumed that there is at least one (first)

Development site and at least two usable areas of geothermal energy that can be developed from this site.

In general, a situation is also considered in which there are several development sites and several usable areas with geothermal energy. To relationships or

To further characterize assignments between a development site and a usable region, the one or more discovery sites will have ordinal numbers k (where k is a natural number and a count index and hence k> 1) and the one or more usable regions Ordinal numbers I (where I is a natural number and a count index and therefore: I> 1) assigned.

Based on a comparison of atomic numbers, a relationship between a useable area and a development site can now be referred to as "assigned" or "unassigned" and distinguished.

A relationship between a usable region having an atomic number I and a region of opening having an atomic number m is referred to herein as an "as-ordered" relationship if the atomic numbers I and m are the same (ie, I = m) the relationship between the first usable area and the first development site, between the second usable area and the second development site, etc., and generally between the lth usable area and the lth development site.

In contrast, a relationship between a usable range having an atomic number I and a digestion location having an atomic number m is referred to herein as a "non-dedicated" relationship or as a non-allocation, respectively

Ordinal numbers I and m are different (i.e., I <> m). In this sense, therefore, there is, for example, a non-matching relationship between the second usable area and the first development site, between the third usable area and the first development site, between the third usable area and the second one

Development site, ... and generally between the lth usable area and the mth development site if the count indices I and m are different, i. if: I <> m.

As used herein, a fluid communication conduit is generally referred to as "improperly opening" as defined by the assignments so defined Fluid communication line is a fluid communication between an L-th usable area and an L-th development site is formed.

As used herein, a fluid communication conduit is generally referred to as "non-compliant" as used herein by reference

Fluid communication line is formed a fluid communication between an L-th usable area and an m-th development site, wherein the count indexes I and m are different, i. that applies: I <> m.

Further, herein, a fluid communication line is generally referred to as "crosslinking" when fluid communication is formed between an I-th usable area and an M-th usable area through the fluid communication line, the count indexes I and m being different, ie, I < > m.

A development site is generally characterized in that a heat exchange device or a connection device is arranged therein.

A heat exchange device can be understood as a device which has a heat energy removal function. By means of the heat energy withdrawal function, the thermal energy contained in the heat exchange fluid may be withdrawn and provided in a suitable form for energy consumption, such as within a system for producing geothermal energy from an inflowing heat exchange fluid comprising in one of the aforesaid associating fluid communication lines

Heat exchange fluid circulation system is pumped. Furthermore, the heat exchange device can have a recirculation function, according to which a heat exchange fluid flowing in, for example through a fluid inlet, is expelled or injected into an injection line after heat extraction, for example from a fluid outlet, and / or inflowing

Heat exchange fluid is promoted or sucked. Specifically, a heat exchange device such as a power plant, which transforms the heat energy extracted from the heat exchange fluid into an electrical voltage and an electric current, or a

Heat exchange means which transfers the thermal energy extracted from the heat exchange fluid into a heat transfer fluid pumped from the heat exchange means to a plurality of heat energy consumers connected to the network and back to the heat exchange means in a secondary fluid circulation system such as a district heating transmission network.

A connection device is here understood to mean a device which has a return function, according to which, for example through a fluid inlet,

inflowing heat exchange fluid after heat extraction, such as from a fluid outlet, is pushed out or reinjected into an injection line and / or inflowing

Heat exchange fluid is promoted or sucked. Alternatively or additionally, the connecting device can the heat energy extraction function of a heat exchange device according to which, in operation of the system, from an inflowing heat exchange fluid recirculated in a heat exchange fluid circulation system comprising the aforesaid assigning fluid communication line, the heat energy contained in the heat exchange fluid is withdrawn and provided in an appropriate form for energy consumption.

At least one connection device and / or the heat exchange device may comprise a solar energy collector device, which is designed to temporarily store solar energy and to transmit it to the heat exchange fluid flowing around in the circulation system.

As a first advantage achievable with the invention, the following should be noted. Because the system connects the first usable area with the second usable area

networked and thus promotes geothermal energy simultaneously from both usable areas, the heat efficiency is greater than if geothermal energy - as previously customary - is promoted from only one usable area. This is due to the limited efficiency and accuracy of stimulation methods, which in some cases reach a propagation length of about 200 meters to 300 meters, and whose direction is barely controllable for long distances from the casing. For this reason, rather smaller usable areas and with artificial stimulation rather shorter cracks are to be preferred. Selecting hermetically separated areas of enveloping geological formations can reduce the risk of water flooding, which causes the largest HDR (Hot Dry Rock) projects to fail.

A second advantage achievable by the invention is that a production period for delivering geothermal energy (i.e., the period of time until any regeneration of the usable area is required) can be extended or even sustained production can be achieved. The background to this effect is to be noted. If a usable area of the production system faster (or more per unit time)

Heat energy is withdrawn, as the usable area flows from the Earth's interior, then the temperature in the usable range is lowered more and more. This can go so far that the temperature is no longer sufficient for a technically achievable transformation into energy for energy consumption or for an economically viable operation of the

Heat exchange device at the development site. In such a case, the promotion of heat energy from the usable range must be stopped and the usable range of time for regeneration, i. for receiving new geothermal energy flowing from the earth's interior. During such regeneration, the temperature increases (recovers) and can with sufficient regeneration time of the

approach the original temperature before opening. This effect is known. The time required for the regeneration represents a downtime for the operator of the production system. Because two usable areas are now developed from the one development site, a production operation can be set up so that - with comparable subsidized heat energy per unit time - the heat extraction for each of the two usable areas is smaller than - as is conventional - this heat energy per unit time would only be promoted to a usable area. This makes it possible to extend the production period for the production of geothermal energy (ie the period until any regeneration of the usable area is required) or even to achieve a permanent production.

A third advantage arises from the fact that at least the networking

Fluid communication line in the section between the first and the second usable range passes through formations, where prevail because of their depth below the surface similar temperatures as in the usable areas. As a result, in the section between the first and the second usable region, heat energy can be transferred into the throughflowing heat exchange fluid in addition to the thermal energy transfer in the first and the second usable region. In other words, geothermal energy from the formations interposed between the useable areas is also developed. The development of geothermal energy from the

However, formations between the usable areas do not take place with the same

Heat energy transfer efficiency as in the usable areas, where the

Heat exchange fluid comes in direct contact with the rock in geological formation. This is because the heat exchange fluid is conducted between the usable areas in a conduit and does not come in direct contact with the rock, and because the contact surface per

Volume unit is lower than in the usable areas.

The system may be one provided at the first development site

Heat exchange device comprising a fluid inlet and a fluid outlet. In this case, the first associatively opening fluid connection line can be connected to the fluid inlet and the first fluid connection line not opening according to the instructions can be connected to the fluid outlet.

The heat exchange device has a function of removing thermal energy from a heat exchange fluid flowing around in the heat exchange fluid circulation system during operation of the system and to provide it with energy in a suitable form. Furthermore, the

Heat exchange device designed to inflow through its fluid inlet

Heat exchange fluid after heat removal from its fluid outlet out to push or to inject. For this purpose, the heat exchange device can have a first suitably designed pump (an injection pump) for displacing the heat exchange fluid through the fluid outlet into the non-improperly connected thereto

Fluid connection line include. The latter is thereby operated as an injection line. The second usable area may be directly or indirectly networked with the first development site and the first usable area. These two alternative embodiments enable a corresponding first and second group of

Further developments.

The second or each further usable area may be directly networked to the first development site and the first usable region, to which the system further includes a first or a respective further cross-linking fluid communication line between the second or each further usable region and the first usable region is formed, may include.

The first non-compliant opening fluid communication line, the second usable area, the first cross-linking fluid communication line, the first usable area, and the first associate opening fluid communication line may form a substantially pressure-tight interconnection system.

The first unassigned opening fluid communication line, the second usable area, the first crosslinking fluid communication line, the first usable area, the first associate fluid communication line, and the first

Heat exchange device may be a substantially closed

Heat exchange fluid circulation system for a flow around in the operation of the system

Form heat exchange fluid. Preferably, the heat exchange fluid circulation system is pressure tight. Because the recirculation system is closed, loss of heat exchange fluid will be low to low or absent as operating time increases (with appropriate selection of suitable geological formation).

In continuation of the inventive idea, it is also possible from a

Development area from not only two, but also three or more usable areas. For this purpose, several suitable embodiments are described below.

The second and each additional usable area may be directly linked to the first development site and the first usable region. In immediate meshing, the system may include a total of m usable ranges, where m is a natural number and 3 <m. Furthermore, the second and every further mth usable regions can each be directly networked with the first development site and the first usable region. As a result, a so-called parallel and direct networking of m usable areas with the first usable area can be formed.

In the embodiment where the system for directly networking the second usable area includes the first crosslinking fluid interconnect formed between the second and first usable areas, the system for directly interconnecting each of the further m usable areas may include a (m- 1) -te networking Fluid communication line, which is formed between the m-th usable area and the first usable area include.

The first unassociated fluid communication line may include a first portion extending from the first development site and extending into a zone in depth, the zone being delimited by a predetermined maximum distance from the first usable region, and thus the first usable one Area is arranged around. A second portion of the first unassociated fluid communication line adjoining the first portion may then be routed out of the zone at a relatively small distance from the first cross-linking fluid communication line and through the same formations as the latter to the second usable range. In this way, both the first and the second can be deduced according to the assignment

Fluid communication line (in its second section) and the cross-linking

Fluid communication lines receive geothermal energy from formations between the first and second usable area.

Accordingly, the second non-compliant fluid communication line may also have a first portion extending from the second development site and extending into a second zone in depth, wherein the second zone is bounded by a predetermined second maximum distance from the second usable region. A second portion of the second unassociated fluid communication line adjoining the first portion may then pass out of the second zone at a relatively small distance from the second crosslinking fluid communication line and through the same

Formations like the latter are led to the first usable area.

In this way, both the first and second unassociated fluid communication lines may receive geothermal energy from formations between the first and second usable regions, at least in their respective second sections (from the first and second zones, respectively).

Preferably, in each case two or more of the m-1 crosslinking

Fluid connection line comprise a common line section. In this

Embodiment, an end of the common line section may open into the first usable area. The second and third usable regions may be associated with a spud point, and from the drilling starting point there may be a development bore having an end portion which is in a predetermined region containing the second and third usable regions. three-dimensional, spherical underground zone is included. In this case, the second and third usable range can be regarded as a cluster which is arranged completely within a spherical boundary, wherein this boundary has a center point and a predetermined maximum radius, wherein the maximum radius is selected such that the boundary contains second and third usable area completely. The development bore may have a branch section arranged within this subsoil zone. Starting from the branch section, a first, second and third cased one can in each case

Branched bore may be formed, wherein the second or third branch bore each having one or more driven into the second or third usable range end portions and the first branch bore one or more driven into the first usable range end portions. In this embodiment, the first cross-linking fluid communication line extending from the second to the first usable range includes the second cased branch bore, the branch portion, and the first cased branch bore, whereas the second cross-linking fluid communication line extends from the third to the first usable range includes the third cased branch bore, the branch portion and the first cased branch bore. In this way, a third usable area is also from one (here, for example, the first) development site

deducible.

In the embodiment described above, in the drill start point associated with a cluster having the second and third usable ranges

Development hole with a arranged in the spherical end portion

End section can be extended to the effect that from the Bohranfangspunkt not only two (the second and third) but even more (in principle many) usable

Areas can be opened. Limiting the number of exploitable usable areas is given by limiting the number of branch bores that can be made out of the access hole. However, this number can in turn be increased by the fact that from a branch hole or more of the branch holes produced by the development hole out yet more

Branch bores are made, etc ..

In order to develop not only two, but also three or more usable areas from a development site, further suitable ones will be described below

Embodiments described.

The second and each additional usable area may be indirectly with the first

Connected to the first usable area. In indirect networking, the system may comprise a total of m usable regions, where m is a natural number and 3 <m. In addition, the system may comprise a total of m predetermined development sites, the second to the third development sites being assigned to the second to the m-th usable area, a total of m-1 further fluid connection lines opening according to the ordinance, each between the second and m-th usable areas. ten development area and the second or m-th usable area are formed, a total of m other unauthorized explicable Fluid interconnecting lines formed between the respective mth access site and the first usable area. On the one hand, the associated fluid connection line formed between the mth access site and the mth usable area allows the mth usable area to be used with less drilling and drilling

Casing effort can be tapped as if the mth usable area would be opened from the first development site, and on the other hand, that the mth usable area easier and cheaper, such as by hydraulically induced

Cracking (English: hydraulic fracturing), can be stimulated.

In an alternative embodiment of a system in which at least a second usable range (i.e., m = 2) is indirectly related to the first usable range and the first

Networked, can the first non-compliant fluid connection line, the second usable area, the second according to the assignment

opening fluid connection line, the second development site, the second non-associate opening fluid communication line, the first usable area, and the first associ- ately opening fluid communication line

form a pressure-tight connection line system. Such indirect routing is also referred to below as a cross-linking arrangement of fluid communication line.

In this system, one provided at the second development site

Connecting means comprise a fluid inlet and a fluid outlet. In this case, the second associatively opening fluid connection line can be connected to the fluid inlet and the second non-improperly opening fluid connection line can be connected to the fluid outlet.

In this system, the first non-compliant

Fluid connection line, the second usable area, the second according to the assignment

opening fluid communication line, the connection means, the second unassociated fluid communication line, the first usable area, the first associ- ately opening fluid communication line and the heat exchange means forming a substantially closed, closed loop heat exchange fluid circulation system for a heat exchange fluid circulating therein during operation of the system. The

Heat exchange fluid circulation system may be pressure tight. Since the circulation system is closed, a loss of the heat exchange fluid with low operating time is low, or hardly or not available.

The arrangement with two usable areas and two development sites, the first development site being the first one to be explicated

Fluid connection line with the first usable area and the first non-improperly opening fluid connection line with the second usable area is in fluid communication, and wherein the second access site is in fluid communication via the second associated fluid communication line with the second usable region and the second unassociated fluid communication line having the first usable region, also cross-linked herein

Arrangement of fluid connection line called.

The cross-linking arrangement and the achievable, coupled and simultaneous development of two usable areas provides the same advantages as the first mentioned above with respect to the invention (greater heat energy efficiency) and second (extended production time) advantage.

In the embodiment in which the second usable area is indirectly with the first

The system may further comprise at least one further third or even further (total: m) usable regions, where m is a natural number and 3 <m. Furthermore, the second and each further mth usable areas can each be indirectly networked with the first development site and the first usable region. This forms a so-called parallel and indirect networking of m usable areas with the first usable area. In this way, a third area and other usable areas are also accessible from one (here, for example, the first) development site.

For parallel and indirect networking of m usable areas with the first usable area, the system may further comprise: a predetermined second, third or more (total: m) development sites, each of the second, third or further development sites being respectively the second, third or third m-th usable area is assigned, a second, third or more (total: m) according to the assignment

opening fluid connection lines, which are formed between the respective second, third or mth development site and the second, third or m-th usable area, and a second, third or more (total: m) non-mappable

opening fluid connection lines between the second, third or mth

Development site and the first usable area are formed.

In an embodiment in which the second usable area is indirectly networked with the first development site and the first usable region, the system may include at least one further third or even more (total: m) usable regions, where m is a natural number and 3 <m applies, and at least one predetermined second or third development site or even further (total: m) development sites include. In this case, each of the m development sites is assigned a usable area, and each usable area and each development site is one that characterizes the respective allocation

Ordinal number n, where n is a natural number and 2 <n <m. In addition to the first (n = 1) associated fluid communication line, the system may comprise at least one second or third fluid connection line or even further (total: m) associated opening fluid connection lines. In this case, the nth assigned connecting fluid connection line between the nth development site and the (n + 1) -th usable area formed and the m-th associated opening

Fluid connection line between the mth development site and the first usable area to be formed. As a result, a so-called annular-serial networking of m usable areas is formed.

In the embodiments with parallel and indirect networking of 2 or m useable regions with the first usable region or with circular-serial

Networks of m usable regions (3 <n) may apply to at least one selected usable region from the group formed from the first to the m-th usable region and the development site assigned to this selected region:

(i) with this selected usable area and the development site associated with that area, two or more other useable areas included in the system in addition to the m usable areas are parallel and indirect or parallel and directly networked, or

(ii) this selected usable area and the area associated with that area

Development sites are involved in a ring-serial networking of two or more still usable areas included in the system in addition to the m usable areas.

One of the following embodiments may be practiced for the associated fluid interconnect lines: (i) at least one of the associated fluid interconnect lines includes one extending from the particular well site substantially vertically in depth to the associated usable area

formed, cased primary bore, or (ii) at least one of the associated

opening fluid connection lines comprises a horizontal from the respective development site and essentially continuous formed into the assigned usable area in, piped horizontal bore.

For the unassigned fluid communication lines, one of the following embodiments (a) or (b) may be realized.

(a) At least one of the unassigned fluid communication conduits comprises a cased bore formed as a primary bore in a first section extending from the respective development site and a secondary section as a secondary bore in the form of one or more adjacent to the first section Horizontal bores each having an end portion which extends into the usable area to be opened, or (b) at least one of the unassigned

opening fluid communication lines comprises one of the respective development site outgoing and substantially continuous into the respective to be developed, assigned usable area formed in, piped horizontal bore.

In the embodiment (a), 6 to 12 horizontal holes may be formed. Furthermore, the at least one crosslinking fluid connection line, which is formed between an i-th usable area and a j-th usable area, can comprise at least one or more, usable from the i-th usable area and substantially continuous to a j-th usable Include area formed in the tubed horizontal bore (s), each having a arranged in the i-th usable area start section and a j-th usable area arranged end portion or have. Here, i, j, m and n are natural numbers with i <> j and i, j <m, where m = n-1 is the number of crosslinking ones

Fluid connection lines and n is the number of usable areas. The number of cased horizontal bores can be 6 to 12. In this way, it is possible to access geothermal energy from the area between the i th and the j th usable area with the respective second section.

A respective unassigned fluid interconnect that is between an ith

A development site and a usable area not assigned to the ith but to a jth development site may include a first section starting from the i-th development site and extending to a branch point. The branch point may be arranged in an underground, three-dimensional, spherical zone, the zone being defined by one of a center point of the i-th usable range approximately within a predetermined maximum distance from the i-th usable range, and around the i-th usable range. be arranged ten usable range extending zone. The unassigned fluid communication line may then be separated from the

Branch point at a relatively short distance to each cross-linking

Fluid interconnections between the i-th and the j-th usable area and through geothermal energy geological formations like the cross-linking ones

Fluid connection line are guided. In this way, both the unassigned fluid interconnect line (in its portions from the branch point) and the cross-linking fluid interconnect lines may be exposed to geothermal energy

record geological formations between the i th and the j th usable range.

An outgoing from an i-th usable area, networking

Fluid communication line and at least the second portion of one of an i-th

Each outstation, unassigned fluid interconnect line may be considered to be a plurality of thin-hole or coiled tubing, respectively, that are substantially parallel in the subsurface three-dimensional region between the ith and the j-th usable regions to each other and to a suitably selected (measured in the horizontal direction) minimum distance from each other are performed, executed. The parallel and spaced guidance of the cased thin bores spans a relatively large horizontal area in the formations in the subterranean three-dimensional area between the i th and the j th usable area, and correspondingly, taps more geothermal energy from that area.

A respective non-assigning fluid connection line can be described as

Be formed injection line. It may also include one or more cased bores, horizontal bores or thin holes or coiled tubing.

Alternatively, a respective non-improperly disclosing

Fluid connection line between an i-th usable range and a j-th

Development site (where i and j are natural numbers or a counting index and where: i <> j) with a first section emanating from the jth development site and a second section adjoining the first section, the second Section has an end portion which is the ith usable area. The portion of the line where the second portion attaches to the first portion may be usable in a three-dimensional zone containing the jth usable range associated with the jth juncture and its bound by a predetermined maximum distance from the jth usable Range is defined to be arranged.

As an alternative to this, a respective fluid connection line which does not open according to the instructions can be designed essentially as a horizontal bore or as two or more thin bores. In addition, the horizontal bore may have a first portion and a second portion as defined above, and wherein the portion of the conduit where the second portion attaches to the first portion is in a three-dimensional zone corresponding to the j-th opening location j -ten usable area, and whose boundary is defined by a predetermined maximum distance from the j-th usable area, may be arranged.

In yet another alternative, a respective unassociated fluid communication line may be formed in the first section as a primary bore and in the second section as at least one secondary bore, wherein the

Secondary bore branches off in a arranged within the n-th zone branch region of the primary bore. In this case, a branch section may be arranged in a three-dimensional zone which contains the j-th usable area assigned to the jth access location, and whose boundary is defined by a predetermined maximum distance from the j-th usable area.

A respective secondary bore may be formed as a thin bore.

When a plurality of unassigned fluid communication lines are substantially parallel to one another and spaced at a suitable minimum distance over a substantial portion of the horizontal distance between two usable regions be guided spaced from each other, as already mentioned above, geothermal energy can be developed from the formations arranged between the two usable areas.

In the system, at least one of the unassigned fluid communication conduits may be implemented as one or more cased horizontal wells or multiple well bores.

The first non-compliant fluid communication line may have a first portion extending from the first development site and extending into a zone in depth, the zone being bounded by a predetermined maximum distance from the first usable region and, thus, that of the first development site

associated first usable area is arranged around. A subsequent to the first section, second section of the first non-assigned

Fluid communication line may be implemented as one or more horizontal bores that are passed between the zone to the second usable area.

Correspondingly, the second non-associate-opening

Fluid connection line have a first portion of the second

Development site extends and extends into a zone in the depth, wherein the zone is limited by a predetermined maximum distance from the second usable area and thus arranged around the said second development site associated second usable area around. A second section of the second unassociated fluid communication line adjoining the first section may then be led out of the second zone at a relatively small distance from the first crosslinking fluid communication line and through the same formations as the latter to the first usable region.

In this way, both the first and the second non-associated

Fluid connection line at least in their respective second sections (from the first and second zone) record geothermal energy from the geological formations between the first and second usable range.

At least the first usable region may be one of the following: (i) a naturally occurring permeable region in a particular geological formation

geothermal energy, which region is substantially hermetically enclosed by impermeable formation, (ii) a permeable region generated by a stimulation process, in particular hydraulically induced fracturing, in a particular, natural state impermeable geological formation geothermal energy, or (iii) a region with a low natural state

Permeability which has been additionally stimulated by hydraulically induced cracking and in which the tip regions of the induced ones are removed from a stimulation starting point Cracks by introducing additives added to the hydraulically acting gel

(so-called fluid-loss additives) have been impermeabilisiert.

At least one other usable region, for example the second usable region, may be one of the following: (i) a naturally-occurring, permeable region

geothermal energy in the same or another permeable geological

Formation, which region is substantially hermetically enclosed by impermeable formation, (ii) a permeable region created by a stimulation process, in particular hydraulically induced cracking, in the same or in another geological permeable formation with geothermal energy as the first usable region, in an im natural state of impermeable geological formation, or (iii) an area of low permeability in the natural state in the same or another geological formation which has been additionally stimulated by hydraulically induced cracking and in which the peak areas of the induced cracks removed from a stimulation starting point Introducing additives added to the hydraulically acting gel

(so-called fluid-loss additives) have been impermeabilisiert.

In all embodiments described so far, a respective n-th

Associated opening fluid interconnector between the nth

Development site and the n-th usable area a cased production well or a cased, emanating from the nth development site horizontal well with a substantially vertical initial section having an n-th usable area arranged end portion (for each atomic number n with 1 <n < m), be present.

Furthermore, a respective nth unauthorized opening

Fluid connection line between the nth development site and the j-th usable area a first section and a second section adjoining the first section (for each atomic number j and n, for which applies: 1 <j, n <m and j < > n). In this case, the first section may extend from the nth access location to an nth zone assigned to the nth usable range, which zone is defined by a maximum interval which is predetermined for the nth usable range, from a central point in the nth usable range is measured from limited. The second section may then extend from the nth zone around the nth usable range to the jth usable range.

To achieve the object as claimed in a first aspect, there is provided a method of generating geothermal energy. The method of generating geothermal energy comprises the steps of: identifying a first subterranean, useable area with geothermal energy, determining a predetermined first development site associated with the first usable area, and producing a first associate mine

Fluid communication line between the first development site and the first usable Area. It goes without saying that producing energy in this context as

Utilization of geothermal energy is to be understood and not the two

Contrary to the laws of thermodynamics.

According to the invention, the method further comprises identifying at least one second or further subterranean usable regions with geothermal energy, and establishing a first unassociated fluid communication line between the first development site and the second usable region. By these method steps and also the method steps described below, the same advantages are achieved as above for the inventive system for the development or production of geothermal energy. Therefore, they are not repeated.

The method may further comprise: crosslinking the second usable area directly or indirectly with the first development site and the first usable region.

At the first development site, a heat exchange device with a

Fluid inlet and a fluid outlet are set up, the first associate opening fluid connection line is connected to the fluid inlet, and the first non-improperly opening fluid connection line is connected to the fluid outlet.

The method may further comprise: immediately crosslinking the second usable area with the first development site and the first usable area, and establishing a first crosslinking fluid communication line between the second usable area and the first usable area.

The method may further comprise: indirectly crosslinking the second usable area with the first development site and the first usable area, determining a second development site associated with the second usable area,

Producing a second associate opening fluid communication line between the second development site and the second usable region, and

Producing a second unauthorized opening

Fluid communication line between the second development site and the first usable area, and

thereby forming a so-called double-cross networking of two usable ones

Areas and two associated development sites.

The method may further comprise indirectly crosslinking the second usable area with the first development site and the first usable region,

Identifying at least one further third or even further (in total: m) usable regions, where m is a natural number and 3 <m, and linking the second and each further m-th usable regions respectively indirectly to the first development site and the first one usable area and thereby forming a so-called parallel and indirect networking of m usable areas with the first usable area.

The method may further comprise indirectly linking the second usable area with the first development site and the first usable region, identifying at least one further third or even further (total: m) usable regions, where m is a natural number and 3 < m, determining at least one second, third or even further (total: m) access points, assigning each of the m access points to a usable area and assigning them to each usable area and each access point from an ordinal number n characterizing the respective assignment, wherein n is a natural number and 2 <n <m, and in addition to the first (n = 1) associated with opening

Fluid connection line, producing at least a second, third or even further (total: m) associated with opening fluid connection lines, forming the n-th associated opening fluid connection line between the nth

Development site and the (n + 1) -th usable range and forming the m-th associated opening fluid connection line between the mth

Development site and the first usable area, and thereby forming a so-called annular-serial networking of m usable areas.

The method may further comprise: for at least one selected usable area from the group formed from the first to the m-th usable area and the development site associated with that selected usable area:

(i) in addition to the m useable areas, identifying two or more yet further useable areas, and either parallel and indirect or parallel and immediate networking of that selected useable area and the development site associated with that area, or

(ii) in addition to the m useable areas, identifying two or more still usable areas, and incorporating that selected useable area and the development site associated with that area into a ring-serial networking of the two or more still usable areas.

Further embodiments of the invention are illustrated below by way of example with reference to the accompanying figures and described in more detail. Where:

Fig. 1 shows schematically a first embodiment of a direct networking of two usable areas of a development site in one

Horizontal section.

FIG. 2 schematically shows a second embodiment of a direct networking of two usable areas from a development site in one

Horizontal section. FIG. 3 shows schematically a third embodiment of a direct networking of two usable areas from a development site in one

Horizontal section.

Fig. 4 shows schematically a fourth embodiment of an immediate networking of two usable areas from a development site in one

Horizontal section.

5 shows schematically a first embodiment of an indirect networking of two usable areas starting from two development sites in a horizontal section.

Fig. 6 shows schematically a second embodiment of an indirect networking of two usable areas starting from two development sites in one

Horizontal section.

Fig. 7 shows schematically a third embodiment of an indirect networking of two usable areas starting from two development sites in a horizontal section.

FIG. 8 schematically shows a fourth embodiment, comparable to the first embodiment of FIG. 5, of indirect networking of two usable areas starting from two development sites in a virtually three-dimensional representation.

FIG. 9 schematically shows a first embodiment for the embodiment of a fluid connection line not opening according to the invention in the area between two usable areas in a vertical plan view.

FIG. 10 schematically shows a fifth embodiment, functionally comparable to the second embodiment of FIG. 6, of a cross-linking of two usable areas starting from two development sites in a vertical section illustration.

FIG. 1 schematically shows a second embodiment for the embodiment of a fluid connection line which does not open in accordance with the invention in the area between two usable areas in a vertical plan view.

Fig. 12 shows schematically the second embodiment of Fig. 1 1 for the

Embodiment of a non-assigning opening fluid connection line in

Area between two usable area in a virtual three-dimensional view.

13 schematically shows a first embodiment of networking three usable regions in a virtually three-dimensional representation, with a second and a third usable region being double-cross-linked indirectly and parallel to one another with a first usable region.

14 schematically shows a second embodiment of a network of three usable regions in a virtually three-dimensional representation, with a first, second and third usable region being networked in series in series one after the other.

Fig. 15 shows schematically a first embodiment of a network of three usable areas, wherein a second and a third usable area parallel to each other and directly using two cross-linking fluid communication lines with a common line section with a first usable area and a common development site and connected thereto from a second development site

(Bohranfangsstelle) are connected using a development hole.

Fig. 16 shows schematically an embodiment of a star-like network of three

Clusters each having two usable regions, wherein first, second and third clusters are networked in parallel with each other with a first central usable area and a common central development site, and wherein the networking of each cluster enables parallel and immediate networking of a second and a third usable Area of the cluster with the first usable area (using a development hole for the respective second and third usable area of the cluster and a cross-linking fluid communication line with a common line section, whose one end portion are connected in the central first usable area) and a non-ordinarily verschließenden Fluid communication line between the central

Development site (drill start site) and the development well,

FIG. 17 shows schematically a sixth functionally similar embodiment of an indirect one with regard to the cross-linking with the embodiment shown in FIG

Networking of two usable areas, wherein both the assigned and the non-assigned fluid composite lines have been made from horizontal wells.

In the following description, the term "line" is used as an abbreviation or synonym for the term in the term fluid communication line, unless expressly stated otherwise.

In the first embodiment of a networked system for generating geothermal energy shown in FIG. 1, the system 1 comprises a first geothermal usable area 10, a single development site 40 located at the earth's surface 5, a second geothermal area 20 spaced apart is too and not natural in

Fluid communication is connected to the first usable area 10, one of the first development site 40 outgoing first associate opening fluid connection line 42, the first usable area 10 with the

Disconnection site 40 connects a first cross-linking fluid communication line 46 between the first usable area 10 and the second usable area 20, and a first non-compliant fluid communication line 44 between the first development site 40 and the second usable area 20. The system 1 further includes an the development site 40 arranged Heat exchange device 80 with a fluid inlet 82 for connecting a

Production line and a fluid outlet 84 for connecting an injection line.

The line 42 and the cross-linking line 46, which open according to the assignment, are of a continuous, outgoing from the development site 40

Horizontal bore 42-H formed. The horizontal bore 42-H was

is generated in a controlled manner and, proceeding from the development site 40, initially extends substantially vertically into the depth and is slowly controlled horizontally in the direction of the first usable area 10 and then extends as centrally as possible into the first usable area 10 and further through the area 10 therethrough in a substantially horizontal direction until it reaches the second usable region 20 centrally or as centrally as possible with its end portion. In the course of the portion of the horizontal bore 42-H between the first 10 and the second 20 usable range, the horizontal bore, where necessary, disproportionately difficult to drill through-drilling formations and reaches at least in its end portion, the vertical height or depth of the second usable area 20, the may be different from the vertical height or depth of the first region 10. Thereafter, the horizontal bore 42-H is continuously piped from the access site 40 through the first usable area 10 and to the second usable area 20 with a tubing technology known to those skilled in the art. The casing is made of metal, especially one especially for this purpose in terms of pressure and temperature resistance and elasticity especially for these

Applications developed developed steel. At the end of the casing process, an end portion of the casing of the bore 42-H is located substantially centrally in the second usable area 20. At the bottom of the casing, a pipe shoe is used in accordance with the prerequisites of piping technology and hydraulic conditions. To establish fluid communication between the interior of the end portion of the casing and the surrounding geological formation, an opening in the boring shoe is used in line 46 in FIG. Alternatively or additionally, an approximately linear arrangement of holes or perforations could be formed in the casing wall.

The unassigned fluid interconnect line 44 is fabricated using a different drilling technology in two successive and different manufactured sections, a first section 44-1 and a second section 44-2. The first section 44-1 leads from the development site 40 in Substantially vertically in depth to near the first usable area 10 and is drilled as a blind hole.

The term "proximity of the region 10" is to be understood here as a region 12 surrounding the region 10 in all three spatial directions whose maximum extent is limited by a predetermined maximum distance 14. The maximum distance 14 may be uniform for all spatial directions

predetermined center of the area 10 are measured from. If a sufficiently well-defined edge of the usable area 10 can be defined, the maximum distance 14 may also be the distance with respect to a nearest point on the edge of the area 10 along a connecting line extending from or to the center of the area 10 in the relevant spatial direction be measured. The predetermined maximum distance 14 defining the extent of the zone 12 is chosen such that the non-improperly opening fluid communication line 44 at least in its second portion 44-2 in the space between the first 10 and the second 20 usable range in a predetermined , relatively small vertical distance to the crosslinking

Fluid connection line 46 is guided.

The substantially vertically extending first portion 44-1 of the unassociated fluid communication line 44 is known to one skilled in the art for substantially vertical drilling as so-called

Primary bore, with a relatively large diameter and as a blind hole down to the first usable area 10 surrounding zone 12 brought down. Subsequently, the primary well is cased in the well known in the art piping technology. After the tubing of the primary bore 48-1 is in a branch section 47 a plurality of relatively thinner branch holes, in the English

Technical language so-called "side-track wells", passed through the casing and through the geological formations into the second usable area 20 by means of the well-known thin-well technologies, which in the English jargon as "Slim-Hole Drilling" or "Coiled These thin-hole technologies allow the bore to be guided along a controllable, but substantially horizontal, course .The course of the branch bores 48-2, also called secondary bores with respect to the primary bore 48-1, occurs by analogy, ie, as already mentioned, at a relatively close, predetermined distance, such as a vertical Distance, to the horizontal bore 46 in the space area between the first 10 and second 20 usable area.

Although in Fig. 1 and also in Figures 2 to 4, 8 to 10, 13 to 15 to illustrate a plurality of thin bores and 17 are shown schematically each three Dunnbohrungen, the number of thin bores in reality is greater and lies between about 5 and 15, preferably in the range of about 6 to 10. The branch holes 48-2 are cased in the skilled person by means of technology over its entire length from the branch region 47 to the second usable region 20. At the end of the piping process are the cased pipes

End portions of the resulting from the piping, a plurality of sub-lines in the second portion 44-2 of the line 44 in the second usable area 20. Der

Inner diameter of the sub-conduits in second portion 44-2 of conduit 44 is significantly smaller, typically in the range of about 2-7 inches, compared to the diameter of conduit 44 in first portion 44-1, where it is typically between about 7 to 15 inches is. The diameter and number of holes,

especially in the second section 44-2 be in the planning of the hole

according to, inter alia, the hydraulic requirements calculated in advance and planned.

After piping all lines 42, 46 and 44, in the second and first usable regions 20 and 10, if or in the example of FIG. 1, there is no natural permeability, a so-called stimulation process

that is, hydraulically induced cracks or fissures in the geological formation in the useable area 20 are formed from the end portion of the casing, more precisely through the opening in the boring shoe (and / or laterally formed perforations in the casing wall) in a manner known to those skilled in the art. For such a stimulation process, the term "hydraulic fracturing" is known in the English language: hydraulically induced cracking serves to increase the permeability of the geological formation in the usable area 20 and fractures in the geological formation, in the so-called "fractures "train. This is the piping over its entire

Length from the site 40 to the bottom of the hole with a hydraulic pressure-transmitting liquid, called a gel or slurry, filled and

then pressurized from the development site 40. The pressure is transmitted to the previously determined geomechanical, in particular geoelastic properties of the geological formation of the usable area adapted time course, that is controlled with a controlled pressure-time dependence, while the pressure-transmitting liquid, the gel, refilled according to its opening into the geological formation opening volume of cracks or fissures , When the pressure thus built exceeds a threshold pressure depending on the rock and the geological formation, the formation of cracks in the rock or in the formation begins, starting from the positions where the pressurization initially takes place. In the case of region 20 in Fig. 1, the opening in the drill shoe is the starting position for the stimulation process. In the example of the usable area 10 in Fig. 1 and in practice relatively frequently, the cracks are starting from lateral openings or

Perforations 69 initiated in the casing wall. The cracks increase in thickness and propagate in a direction lateral to their thickness as long as the applied hydraulic pressure is maintained above the threshold and the hydraulic fluid is replenished at the site 40. By the amount of applied hydraulic pressure, its exposure time to the geological formation and the amount of per unit time at the site 40th

and, respectively, through the exit aperture of the casing, the extent of induced cracking is expressed in terms of cracking distance with respect to initiation point of cracking and crack width, or in terms of increase in permeability for one

Fluid flow through the rock or the geological formation controlled in the stimulated usable area. The fluid that transfers the hydraulic pressure contains solid components called "proppants", which are used to keep the cracks or fissures created as open as possible.

It is known to those skilled in the field of geomechanics that such hydraulically induced cracks or fissures with their thickness or gap width in the direction of lowest stress value, referred to in geomechanics with σ ₃ , the three-dimensional, from the three main components σι, 02 and 03 form geomechanical stress tensor formed, cf. this also the Fig. 18 and

in this regard, the following statements. The cracks or fractures initiated with their gap thickness in the direction of 03 then propagate in the direction perpendicular to this direction (σ ₃ ), in all possible directions to this direction vertical, the directions of the components (σ- _\ , σ ₂ ) containing vertical plane starting laterally from the initiation point. At this time, the gap width to be measured substantially in the direction of 03 increases as long as the pressure is maintained and the liquid propagating into the forming cracks or fissures is replenished at the development site.

The direction of the minimum geotectonic stress value 03 of the

geomechanical stress tensor is ideally horizontal, but may deviate from the horizontal direction, especially when geodynamic or tectonic stress fields originating from the mantle exert their effect in the

Transfer lithosphere and thereby also affect the geological structures.

Accordingly, the propagation direction of the fissures or fissures is in the plane perpendicular to the direction of 03, typically in a substantially vertical plane containing the components (σ- _\ , σ ₂ ) of the stress tensor. In this case, as stated, the effect of the verticality can occur due to the effect of geodynamic or tectonic stress fields.

For the interpretation of Fig. 18 let us here, without going into the details

Geomechanics, for understanding the following. Of the

Geomechanical stress, in which a rock loses its elastic property and tears, is dependent on the direction in the three-dimensional space in which the stress acts, and can generally be due to an ellipsoid with three different ones

Main axis lengths are represented mathematically. The three vectors σι, 02 and 03 schematically shown in Fig. 18 symbolize with their lengths and their

Directions The lengths and directions of the three major axes of the three-dimensional ellipsoid, which mathematically describes the directionality of the geomechanical tearing stress of the rock. It says:

σι for the greatest value of geotectonic stress;

03 for the smallest value of the geotectonic stress, and 02 for the second largest value of the value lying between σι and 03

geotectonic stress.

Typically, the direction of greatest stress value σι is one in the

Essentially vertical direction. The value of σι is also determined by the height or the weight of the geological strata above it.

Accordingly, the directions of 02 and 03 are typically oriented horizontally. What has been exemplified above with regard to the operation of the stimulus or hydraulic cracking applies not only to the crack formation in the second usable area 20 of FIG. 1, but also to the situation in the first usable area 10 of FIG. 1 and also applicable to the usable areas shown in the remaining attached figures 2 to 17. Details of the mode of action of the stimulation methods used will not be repeated in the description below.

After this digression into geomechanics, reference is made to the situation shown in FIG. The usable areas 10 and 20 are technically further developed as follows. The stimulation of the second usable area 20 is carried out starting from the bore bottom of the conduit 46 (and / or laterally through holes or perforations (not shown) end portion of the casing). The cracks or fractures oriented in a substantially vertical plane propagate with it an initial direction of propagation as in Fig. 1 is symbolized by the arrow 28. Of the

Stimulation process is continued until the cracks or fissures have taken a sufficiently large area. The extent of this range is calculated and planned in advance and serves to facilitate the thermal exchange between the geothermally hot matrix (formation) and the flowing through

Enlarge heat exchange fluid to a considerable extent. Only after the formation of the (artificially) stimulated usable area 20 is the

Horizontal bore 44-2 out in the permeabilized usable area (20).

The understanding of the stimulation technologies originally developed in the oil and gas industry and now also applicable in (deep) geothermal energy can now be applied to the concept of "more useful

A geothermally usable area in a geological formation may be a naturally occurring area with a permeability sufficient for the flow of the heat exchange fluid within which fluid communication is formed through openings (such as through the open or open tube shoe of FIG 1, in the second usable area 20, or holes or perforations 68 formed in a casing wall, as indicated in the first usable area 10 in FIG geological formation, into which flow paths, in the English

Specialist language called "Flow ILines" of the pressure gradient between the two flow within the usable range formed conduit openings flow of used in the system 1 in the circulatory system

Heat exchange fluid. In general, the heat exchange fluid is water. However, there are also special cases in formations with particularly high formation temperatures, about 180 ° C, ammonia water is used as a heat exchange fluid.

As used herein, the term "useable area" is understood to mean the area covered by the flow lines in a formation, which may be a naturally occurring geologic formation with sufficient permeability, a permeabilized area created by stimulation techniques in a natural impermeable area

Formation.

After the stimulation of the second usable region 20, the first region 10 is still activated or stimulated. For this purpose, in the section extending through the first usable region 10 of the piped horizontal bore 42-H (or in the course of the line 46), a section which is essentially selected in the center of the usable area 10 to be stimulated in the planning. In this section, a plurality of holes or perforations 68 are preferably formed in the tubing in a linear array along the tube longitudinal direction.

Thereafter, stimulation processes are propagated through the perforations 68, but not in the pre-planned position of the tube sealer 63, until the desired extent of the useable area 10 is achieved

Perforations 68 sprayed, as symbolized in Fig. 1 to prevent short circuits for the flow path of water along the pipe wall and to expand the area flowed through. Finally, a pipe sealing device 63, in the English language "packer", in the conduit 46 up-hole with respect to the

Diaphragm 62 introduced and installed and permanently closed fluid-tight.

To establish a closed circuit circulating fluid for heat transfer fluid, transfer pumps are positioned within the tubing at suitable, predetermined and planned locations within the tubing. Thus, after activation of the first usable area 10, a first delivery pump 60 is installed upstream of the holes 68 in the area 10 of the conduit 46. A second feed pump 61 has been already after the stimulation of the second usable area 20 through the bottom of the bore 46 in the vicinity or in an end portion of the Line 46 is positioned and installed before line 46 passes through

Sealing device 63 has been closed in the first region 10.

In the manner described above, in the system 1 is a closed

Circulation system for the heat exchange fluid has been produced. The circulatory system includes the unassigned openable conduit 44 with its first 44-1 and second 44-2 sections (represented by arrows 86-1 and 86-2 indicating flow direction), the flow area (more precisely that of FIGS

Flow lines detected area) in the second usable area 20 (symbolized by the arrow 86-3), the crosslinking line 46 (that is, from the

Bore bottom up to the pipe seal means 63 extending portion of the cased bore 42-H) the area covered by the flow lines in the first usable area 10 extending from the downhole with respect to the

Closure means 63 formed holes 68 'in the wall of the casing up to the bore 68 formed with respect to the closure means 63 formed holes (symbolized by the arrows 86-5 and 86-6), the ordinal opening line 42 (ie, the of the closure means 63rd extending to the access site 40, the portion of the tubed horizontal bore 42-H shown by arrows 86-7 and 86-8).

The second usable area 20 is immediate, i. without using a second development site, networked with the first usable area 10 and the development site 40 by the unassociated opening 44 and the crosslinking line 46.

The line 46 with the feed pump 61 acts as a production line in

conventional sense for the second usable area 20 and as injection line in the conventional sense for the first usable area 10. The line 42 with the

Feed pump 60 functions as production line for the first usable area 10. The recirculating heat exchange fluid circulating system is closed when the ground surface side start portion (in FIG. 1 at 6) of the second usable area injection line 44 communicates with the injection outlet (fluid outlet 84)

Heat exchange device 80 and the end portion of the line 42 to the

Production inlet (fluid inlet 82) of the heat exchange device 80 is connected.

When the circulation system (48-1, 48-2, 20, 46, 10, 42, 80) is closed, the heat exchange fluid is injected through the conduit 44 (44-1, 44-2) into the second usable area 20 geothermal energy there is, by means of the line 46 discharged from the area 20 and injected into the first usable area 10, there receives additional geothermal energy and is then conveyed out therefrom by means of the line 42 and the heat exchange device 80 is supplied. Even when flowing through at least the second portion 44-2 of the conduit 44 and through the conduit 46, the heat exchange fluid absorbs heat energy. At least the heat energy absorbed in these line sections 44-2 and 46 and in the second usable area 20 goes beyond what would be achieved in the hitherto customary development of a usable area, here for example a usable area, from a development site, here 40 , In the heat exchange device 80, the geothermal energy delivered in this way from the second 20 and the first 10 is removed by means of heat exchangers and made available in a suitable form for energy consumption. Furthermore, the device 80 comprises

at least one feed pump, which is used as an injection pump for

Reinjecting (displacing) the heat exchange fluid into the injection line 44 of the circulatory system.

Also, the embodiments of a system 2, 3, 4 shown in Figs. 2, 3 and 4 for the realization or production of geothermal energy realized

with respect to the operation for producing geothermal energy, the concept already described with reference to FIG. 1 of the direct networking of two usable areas 10, 20 from a single development site 40. For this purpose, the systems 2, 3 and 4 shown in FIGS 4 each have a first usable area 10 with geothermal energy, the first predetermined development site 40, which is associated with the first usable area 10, a first assigned according to

opening line 42 between the first development site 40 and the first usable area 10 and a second usable area 20 with geothermal energy, and also a first crosslinking line 46 between the first 10 and the second 20 usable area and a first non-according to

opening line 44 between the first development site 40 and the second usable area 20.

Upon realization of the FIGS. 1 to 4 common concept with the

However, the above-mentioned components, which allow the immediate networking of the second usable area 20 from a single development site 40, the embodiments shown in FIGS. 1 to 4 differ from each other

with respect to those used for the production of lines 44, 46 and 42 Technologies, such as drilling, tubing and stimulating the usable areas 10 and 20.

For producing the system 2 shown in FIG. 2, the first

according to the invention opening fluid connection line 42 using known in the art vertical drilling technology as from the development site 40 of substantially vertically propelled in the depth of primary hole, the first usable area 10 directly penetrates and ends as a blind hole, brought down. The primary bore thus produced is over its entire

Length of extension from the development site 40 to the bottom of the well in or below the first usable area 10 cased. Subsequently, starting from a predetermined branch region, a branch bore, known as a "side-track well", is begun., For producing the first crosslinking fluid connection line 46, a plurality of substantially horizontally directed second usable region 20 are led from said branch point and with its end portion, the second usable area 20 is formed substantially centrally or centrally fitting thin bores 95-1, 95-2, 95-3th course, the course of these holes is pre-planned, any difficult to penetrate geological formations are avoided if possible and heights - respectively.

Teufenunterschiede between the first 10 and the second 20 usable area balanced. The horizontal wells are also cased over their entire course from the branch point on the primary well to the well bottom in the second usable region 20. Thereafter, the second usable area 20 is stimulated from the end portions of the manufactured pipe (s) 46 by hydraulically-induced cracking, initiated from the open bore bottom, depending on the geological formation conditions, and / or perforations formed in the sidewall of the end portion ,

The unassigned fluid communication line 44 is formed in two sections, a first section 44-1 and a second section 44-2. The first portion 44-1 (primary bore 48-1) is made as a vertical bore from the development site 40 such that an end portion of the bore is in relative proximity to the first usable area 10, i. as already described with respect to Fig. 1, within a predetermined by a

Maximum distance 14 from the first usable area 10 from defined zone 12. The primary bore 48-1 ends as a blind hole in the by the maximum distance 14th defined zone 12. Subsequently, the primary bore is cased over its entire length. Then, to produce the second section 44 - 2, starting from a predetermined branching section 47 arranged within the zone 12, a plurality of branch bores with likewise known ("multi-lateral side-track wells") branching technology are formed up to 15, possibly 6 to 10, branch bores are slowly navigated in a substantially horizontal direction within the framework of the drill-string's mechanical load-bearing capacity, which is limited in these depths or borehole lengths, respectively introduced into the second usable area 20 and each cased over its entire length. The bore of the blind bore primary bore 48-1 is closed by a packer (not designated). If necessary, starting from and through the open bore soles of the plurality of multi-lateral bores of the conduit 44-2 by means of hydraulically induced cracking, the second usable area 20 is additionally stimulated in the area around the end portions of the plurality of multi-lateral bores. This will be a

Fluid communication between the bottom of the conduit 46 and the soles (or lateral perforations) of the plurality of conduits made in section 44-2. A first

Feed pump 61 is introduced and installed through conduit 42 and conduit 46 into the end portion of conduit 46 into second usable area 20. The first usable area 10 is stimulated from holes or perforations (not shown) by means of hydraulic cracking. Subsequently, in the conduit 46, downhole with respect to the branch point but in the vicinity thereof and in any case within the intended first usable area 10, a plurality of holes (perforations) 68 and 69 for establishing fluid communication from the position 69 to the position 68 in the wall the piping of the conduit 46 and 42-H formed. In a pre-planned position is in line 42

Upstream of the branch point, a pipe closure device 63 (packer) is inserted and installed for permanent retention. A second

Feed pump 60 in the conduit 42 bores upstream with respect to the holes 68 introduced. The initial section on the surface of the earth 5 of the conduit 42 is connected to the fluid inlet 82 of the site 40

Heat exchanging means 80 and the ground surface side initial portion at the earth surface 5 of the conduit 44 are connected to the fluid outlet 84 of the device 80. This closes the circulatory system. In FIG. 2, the heat exchange fluid circulating system includes the unassociated fluid communication conduit 44 with its first and second sections 44-1, 44-2 (directional arrows 86-1, 86-2), the fluid communication between the wellbores of the plurality of FIGS Thin bores made of sections 44-2 and the bottom of the conduit 46 (arrow 86-3), the line 46 (arrow 86-4), the fluid connection in the first usable area 10 of the holes 69 to the

Holes 68 (arrows 86-5 and 86-6), line 42 (arrow 86-7) and the

Heat exchange device 80.

In the illustrated in Fig. 3 third embodiment of the concept of

In the system 3 shown in Fig. 3, by networking two usable areas 10, 20 from a development site 40, a closed loop system is also produced for producing geothermal energy from the usable areas 10 and 20 in the form of an associated fluid communication line 42 between the first A development site 40 and the first usable area 10, a first cross-linking fluid communication line 46 between the first 10 and the second 20 usable area and a first non-associated

opening fluid communication line 44 between the first development site 40 and the second usable area 20.

The connection line 42 which opens according to the assignment is formed in the manner already described in the form of a vertical primary bore emanating from the development site 40 and ending in the first usable area 10.

Subsequent to the casing (and cementing) of the bore 42, a stimulation process is performed to artificially produce the first usable region 10. The tubing is laterally perforated and an underwater pump 60 is inserted and installed.

The unauthorized connecting line 44 becomes

again in two sections, a first section 44-1 and a second

Section 44-2 formed in a similar manner as in the second embodiment shown in Fig. 2.

Only for the development of the second usable area 20, but not for the subsequent production of geothermal energy from the two areas 10 and 20, which takes place exclusively from the development site 40, a temporarily used, second development site 90 is set up to produce development holes 92, 98, 91 for the second usable area 20 and the Inserting the corresponding piping into the development wells. In order to stimulate the second usable area 20, the exploration well 92 is executed in vertical drilling technology as a primary well, and the second useful area 20 is initiated and continued through the perforations in the bore bottom area of the well 92 until a desired extent of the opened second usable area 20 has been achieved as a pre-planned result , A second development well 98 is drilled from the development site 90 such that the wellbore is located in (or outside but near, the designated second usable region 20, ie, a zone 22 defined by a predetermined maximum distance 28 around the region 20) is. The line 46 is called

Secondary bore in the form of several of the bore 98 of a

common branch section 95 outgoing horizontal bores

(Thin holes 95-1, 95-92, 95-3) are formed so that the end portions of the plurality of holes reach the first usable area 10. The

Opening bore 92 and connecting bore 98 may also be for former production of geothermal energy from second usable area 20, former injection or production lines. In any case, from the development hole 92 in a branch portion 93 as starting

Abzweigbohrung a connection hole 91 made using modern,

fully graded and targeted horizontal drilling technology.

Drilling target for this bore 91 is to hit the connection bore 98. The

Connecting bore 91 has reached the drilling target course and was cased. In bore 92, downhole of branching portion 93 became a first

Feed pump 61 introduced and installed. Upstream of the branch portion 93, a sealer 93 (packer) was inserted and installed. In the bore 98 was upstream with respect to the mouth of the

Connecting hole 91 a closing device 64 (packer) introduced and installed. The first usable area 10 has already been hydraulically stimulated starting from the line 42; the initial formation direction is indicated by the arrow 18 in FIG. A second feed pump 60 was inserted and installed in the end portion of the pipe 42.

After connecting the initial sections (relative to the surface of the earth 5) of the lines 44 and 42 to the heat exchange device 80 (fluid outlet 84 and

Fluid inlet 82) is made a closed loop system. This includes the First 44-1 and second 44-2 section of the conduit 40, the fluid connection in the second usable area 20 between the end portion of the line (or lines) of the portion 44-2 and the bottom of the cased bore 92 in the region from the sole to Branch section 93 (here supported by the feed pump 61), the

Connection hole 91 and the branch area 95 in the bore 98th

Outgoing multi-lateral bores 95-1 to 95-3, the fluid connection in the first usable area 10 between the end portions of the bores 95-1 to 95-3 and the bottom of the conduit 42, the conduit 42 and the heat exchange device 80th

In the fourth embodiment shown in FIG. 4, the system 4 differs from the system 3 shown in FIG

Development of the second usable area 20 and the wiring in the area 20. The preparation of the associate opening fluid communication line 42 for the first usable area 10, the stimulation of the first usable area 10 and the preparation of the cross-linking fluid communication line 44 in the form of a first portion 44-1 (Primary bore) and branching therefrom secondary portion (a plurality of horizontal lines in the section 44-2 made from branching off from the primary bore secondary holes 48-2) correspond to that shown in Fig. 3

Embodiment of the system 3.

From a second development site 90, which is only temporarily set up to open up the second usable area 20, a vertical borehole is called

Drilled primary hole in the second usable area 20 so that the bore of the primary bore 94-1 centrally or the second usable area 20 reaches. The second usable area 20 has been hydraulically stimulated from the bottom of bore 94-1. A branch bore 97 extending from a predetermined branching section 93 has already been designed pointing in the direction of the first usable region 10 as a blind bore up to an end section (at 96 in FIG. 4) and in the form of several horizontal bores into the first usable section 10 and cased. In doing so, the connection between the multiple horizontal bores 95-1 to 95-2 and the branch bore 97 has been made using known interconnection technology (in English:

"Liner") connected at point 96 with a piping of the branch hole 97.

Alternatively, the bores 95-1, 95-2,95-3 can be made as sidetrack bores from the tubing 46. To complete the circulating system for the heat exchange fluid, a first feed pump 61 was formed in the cased bore 94-1 introduced and installed downhole with respect to the branch portion 93, a closure means 63 also in the bore 94-1 but introduced and installed upstream with respect to the branch portion 93, and a second

Feed pump 60 introduced and installed in the end portion of the line 42.

The circulatory system thus produced comprises the conduit 44 with its first 44-1 and second 44-2 sections, the fluid connection in the second usable area 20 between the soles of the conduits of the second section 44-2 and the bottom of the cased bore 44 in the region of Sole to the branch portion 93, the branch hole 97 and its continuation in the form of the several cased

Horizontal bores 95-1 to 95-2, the fluid connection in the first usable area 10 between the end portions of the bores 95-1 to 95-3 and the bottom of the conduit 42, the conduit 42 and the heat exchange device 80th

A first, second and third embodiment of a system 100, 100 'and 100 "for producing geothermal energy are shown in Figures 5, 6 and 7. In these embodiments of a system 100, 100', 100"

Concept of indirect networking of two usable areas and two

Development sites realized. The shown in Figures 5 to 7

Embodiments have in common that each system 100, 100 ', 100 "comprises: a first subterranean usable area 1 10 with geothermal energy, a second subterranean usable area 120 with geothermal energy, a first predetermined access area 140, which is the first usable area 1 10, a second predetermined development site 150 associated with the second usable area 120, a first associate-opening fluid communication line 142 between the first development site 140 and the first usable area 110, a second building according to the invention

Fluid communication line 152 between the second access site 140 and the second usable area 120, a first unassociated fluid communication line 144 between the first access site 140 and the second usable area 120, a second unassociated fluid communication line 145 between the second access site 150 and the first usable area 1 10, and one at the first development site 140

The latter has at least the same functionalities as the heat exchange device 80 shown in FIGS. 1 to 4 and comprises a fluid inlet 182 for connecting a production line the geothermal energy from one or more (in particular: two) usable areas is promoted, and a fluid outlet 184, on which a

Injection line of the geothermal system is connected. With the

Connecting the arranged at the first development site 140

Heat exchange device 180 to the earth surface side initial sections of the production and injection lines, a circulation system for the circulating in operation heat exchange fluid is closed. Still common to the embodiments shown in FIGS. 5 to 7 is that a so-called connection device 190 is provided at the second development site 150, which in a comparable manner to the heat exchange device 180 also has a fluid inlet 192 and a

Fluid outlet 194 has. At the fluid inlet 192 and fluid outlet 194, respectively, a corresponding, Erdoberflächenseitiger initial section of a production or an injection line of the geothermal system is connected.

Further common to the embodiments shown in Figures 5 to 7 is the conceptual design of the indirect networking of the two usable ones

Areas 1 10 and 120. The first usable area 1 10 is in the network

integrated by the first associated opening line 142, which connects the area 1 10 with the first development site 140, and the first non-improperly opening fluid connection line 154, which connects the area 1 10 with the second development site 150. The second usable area 120 is incorporated into the network by the second associate fluid communication line 152 connecting the second usable area 120 to the second development site 150, and the second non-compliant

opening fluid communication line 144, which connects the area 120 with the first

Development site 140 connects. The first 144 and second 154 non-compliant fluid communication line is, and that is one

Common to the embodiments shown in FIGS. 1 to 4, namely the non-improperly opening fluid communication line 44 (regardless of the multiple embodiments thereof), that the lines 144 and 145 starting from the respective development sites 140, 150, initially as in

Substantially vertically in the depth and in the vicinity of the access areas 140, 150 associated usable areas 1 10, 120 are formed with a first portion 144-1, 154- 1 and a second portion. The respective first section 144-1, 154-1 is designed as a primary bore. One each, join the first section 144-1, 154-1 subsequent second section 144-2, 154-2 has an arcuate initial section and an adjoining section which extends into the respective laterally remote usable area 120, 110. The respective arcuate portions in the conduits 144, 154 are formed "near" that usable area 110, 120 associated with the access site 140, 150 from which the conduit 144, 154 extends, the respective second portion 144-2 , 154-2 of the conduits 144 and 154 is formed as a secondary bore branching from the primary bore or a plurality of secondary thin bores 14. The conduits 144 and 154 may also each extend as a continuous, outgoing from the respective associated development site 140, 150, preferably

course-controlled horizontal bore can be formed. And they can be compared in terms of the drilling and piping technology used in comparable or

various ways are produced.

As suggested from a consideration of FIGS. 5-7, the configuration of the leads 142, 144 and the leads 152, 154 are referred to herein as the two usable regions 110 and 120, indirectly and doubly cross-linked.

The embodiments shown in FIGS. 5 to 7 differ with regard to the configuration of the second development site 150

arranged connecting device 190. In the first shown in Fig. 5

Embodiment, the connecting device 190 is a mere function of

Conveying the heat exchange fluid from the connected production line 152 and re-injecting (suppressing) the heat exchange fluid into the second non-improperly opening line 154 serving as the injection line. For this purpose, the connection device 190 is designed approximately as a mere conveying or pumping station 191 and comprises one on the Fluid inlet 192 connected pump and / or optionally provided with suction injection pump, which operates the fluid outlet 194. In the second embodiment shown in Fig. 6 is the

Connecting device 190 as a conveying and / or pumping station and heat exchange station 195, for example, as a heat exchange device 170 with a fluid inlet 172 and a fluid outlet 174 formed. The heat exchange device 170 has a similar structure as the heat exchange device 180 disposed at the first development site 140. In the third embodiment shown in FIG. 7, the connection device 190 (like the embodiment shown in FIG. 5) has a function of pumping and is as a pumping station 190 trained. In addition, the connection device 190 in FIG. 7 has a solar energy collector device 196, which serves to capture solar energy, to buffer and by means of heat exchange by the conveyor or

To supply pumping station 191 in operation flowing through the heat exchange fluid. By means of the solar energy collector device 196, any heat losses of the heat exchange fluid circulating in the circulation system of FIG

Flow path in formations whose temperature is below the temperature of the flowing heat exchange fluid can be compensated. In any case, in addition to the geothermal energy absorbed in the usable regions 110 and 120, the heat exchange fluid flowing around during operation will still have solar energy

Sourced.

FIG. 8 schematically shows a fourth embodiment of a system 100 which corresponds to the system 100 shown in FIG. 5 with regard to the interconnection of the lines. In Fig. 8, however, a schematic, virtually three-dimensional view of the underground part of the system is selected. The system shown in FIG. 8 comprises the same functional elements which are also denoted by the same reference numerals in FIG. 8 as in the system 100 shown in FIG. 5. As already mentioned with regard to FIGS. 5 to 7 as a possibility, For example, in the embodiment shown in FIG. 8, the first unassociated fluid communication line 144 extending from the first enclosure 140 is defined as a blind bore in its first portion 144-1 as a blind bore in the vicinity of the first usable area 110 and in its second portion 144-2 are formed as a plurality of directional thin bores branching off from the primary bore 148-1 (referred to as "sidetrack") .These are in turn drilled relatively slowly in a substantially horizontal direction within the allowable load of the thin bore drill string and afterward Drilling over its entire length from branch point 147 to its respective Bo insole consistently cased. In

In a technologically comparable manner, the second unassociated fluid connection line 154 is also produced in two sections 154-1 and 154-2, in the first section 154-1 as a primary bore 158 that extends substantially vertically into the depth and into the vicinity of the second usable area. 1, and in the second section 154-2 as a plurality of thin-hole or coiled tubing technology, directed from a branch point 157 of the primary bore 158-1, and extending from the directional thin bores as claimed relative to the drill string are drilled relatively slowly in a horizontal direction in the essential.

Fig. 9 shows schematically a first embodiment for the design or management of a plurality of substantially horizontally extending bores, which are produced in thin-bore (slim-hole or coiled tubing) technology as a secondary bore, branching off from a common primary bore. The concept shown in Fig. 9 is transferable to those shown in Figs

Embodiments with the non-assigning opening

Fluid connection lines 44, in particular on the second sections 44-2; 5 to 7 with the first and second non-improperly opening fluid communication lines 144 and 154,

in particular, their respective second sections 144-2 and 154-2; to the embodiments shown in Fig. 8 with the first and second non-improvised fluid communication lines 144 and 154, particularly in their respective second sections 144-2 and 154-2; to that shown in FIG

Embodiment, in particular the respective second sections 144-2 and 154-2 shown there; the system 200 shown in Fig. 13 with the respective two-section conduits 248, 254, 268 and 269, in particular their respective second sections 248-2, 254-2, 268-2 and 269-2; to the system 300 shown in Figure 14 with non-improperly opening connecting lines 348, 358 and 368, in particular their respective second sections 348-2, 358-2, 368-2; the system 400 shown in FIG. 15 having the respective non-improvised fluid communication lines 450 and 452, particularly their respective second sections 450-2 and 452-2; to the system 600 shown in Fig. 17 with the respective non-improvising fluid communication lines 648-2-1, 649-2-1, 648-2-2, 649-2-2, 648-2-3, 649-2 3, in particular their respective second sections (not indicated in FIG. 17), which open into the "outboard" usable areas 620-1, 630-1, 620-2, 630-2, 620-3, 630-3 , and to the respective interconnecting fluid interconnecting lines 646-1, 646-2, 646-3 terminating in the first usable area 610. For the purposes of the transferability of the concept shown in Fig. 9 hereinabove, the following description thereof is only for reference numerals used therein to those shown in Figures 5 to 8 and 10

Embodiments related. As can be seen in FIG. 9, a plurality (in FIG. 9 are shown schematically only three) starting from a primary bore 148 - 1 branch in thin bores approximately 3, 4, 5, 6, 8, 10, 12, 14 or 15 (Slim Hole or Coiled Tubing) technology

executed secondary bores 48-2 in a substantially horizontal direction from a primary bore 148-1 (as shown in Fig. 9 left) and were in the defined as a drill target and incorporated into the networking, useable area 120 out. As also schematically indicated in FIG. 9, the plurality of secondary thin bores 148-2 branch off from a common branch section from the primary bore 148-1, run in a divergence region 143 in firstly diverging directions in the substantially horizontal plane, pass through one another first arcuate portion are guided from the first arcuate portion substantially parallel to each other until they reach the usable area to be incorporated into the network 120, there pass through a second arcuate portion and extend in a convergence region 145 in

converging towards each other until they are relatively close to the

according to the ordinarily developing line 152. The one on the other

converging directions are aligned with the center of the usable area 120. The usable area 120 is approximately from the bottom of a

Associated opening fluid connection line 152 by hydraulically stimulated formation of cracks 129 stimulated or activated.

It is recalled that a distance between the primary bore 148-1 and the one measured within a substantially horizontal plane

crosslinkable usable area 120 - or even a distance between two usable areas, which are to different development sites ordered - may be relatively long and between about 1000 m and 5000 m, but typically about 2000 m to 3000 m. Due to the substantially parallel course of the

Secondary bores 148-2 are spanned or spanned by the bores 148-2 running parallel to one another and lying in the substantially horizontal plane. The parallel holes 148-2 partially trap the geothermal energy transmitted through this surface out of the earth's interior (ie vertically upwards in the earth's crust) by heat conduction. The geothermal energy collected by the course shown in FIG. 9 of the surface formed by the bores guided in parallel and the geothermal energy trapped by this surface or by the heat exchange fluid flowing through boreholes 148-2 becomes, in addition to that in FIGS absorbed geothermal energy recorded networked usable areas - of the flowing through the holes 148-2 heat exchange fluid. Therefore, the surface horizontally spanned by the bores 148-2 and the spanning guide of the horizontal bores 148-2, respectively, contribute to an increase in heat energy transfer efficiency to the heat exchange fluid.

Fig. 10 shows schematically a second embodiment for a possible

Embodiment of a non-associating (or cross-linking) fluid communication line with a further development, which comprises stimulating the usable regions 110 and 120 out of the fluid communication lines on the basis of the embodiments shown in FIGS. 5 to 7 for a double-diagonal

Networking between the two usable areas. However, the concept shown in Fig. 10 is also transferable to the configuration of crosslinking

Fluid communication lines, in particular their end portions, which should be configured as starting points for stimulation method / are. In FIG. 10, functionally and structurally similar elements of the circulatory system shown in FIG. 10 are given the same reference numerals as the corresponding elements shown in FIGS. 5 to 7. In a particular embodiment of the embodiments shown in FIGS. 5 to 7, in the system 100 'shown in FIG. 10, the respective second sections 144'-2 and 158'-2 of the first and second non-improperly opening fluid connection lines 144' and 144, respectively. 154 'formed as from a respective first portion 144-1 or 154-1 of a primary bore outgoing, two or more, in thin-bore (coiled tubing) technology and in

Horizontal drilling technology designed holes 148'-2 and 158'-2. The holes 148'-2 and 158'-2 extend from their respective branch point 147, 157 in one

Section with mutually divergent directions, approximately comparable to the divergence region 143 shown in FIG. 9, then largely substantially parallel to each other in a substantially horizontal plane and are up to their provided as a bore target and yet to be stimulated usable area 120 'or 1 10 'continued. In FIGS. 10 and 11, the usable regions 110 and 120 are now hydraulically stimulated. The particular stimulation method used is initiated from a plurality of holes 148'-2 and 158'-2 (Fig. 10) and 158-2 (Fig. 1), respectively, prior to drilling the bore 147-1. The initiated cracks propagate in the direction of the mean tectonic stress σ2 (144-3). The vectors 1 17 and 127 (in Fig. 10) and 1 17 (in Fig. 1 1) are representations of Propagation direction of the forming cracks. At the same time, the vectors also show the flow direction of circulating heat exchange fluid (eg the water) as it flows through the usable range 1 10 'and 120' (in Fig. 10) and 1 10 (in Fig. 1 1) in the production phase of the system for producing geothermal Energy.

In Fig. 10, it is indicated that linear arrays having a plurality of openings

(e.g., perforations) are formed in the end portions of the piping conduits 154-2, out of which at a simultaneous pressurization of the

Development site 1 10 from an area between the parallel

End portions of the piped lines 154-2 is stimulated. So will the

Fluid connection from the end portion of the unauthorized opening

Fluid connection line 154 'to the end portions of the assigned

opening fluid connection line 142. In an analogous manner, the second usable 120 'is formed by simultaneous stimulation from two substantially parallel horizontal bores 148-2 and the fluid communication from the end portion of the non-improperly opening conduit 144'-2 to the second

Forming end portion of the second associate opening fluid connection line 152.

A refinement with respect to the geometry, in particular an enlargement of the volume area in the geological formation sensed by the stimulation with respect to the simultaneous stimulation by hydraulically induced cracking between adjacent, parallel (cased) boreholes described above with reference to FIG Fig. 1 1 shown in a schematic vertical view and 12 in a virtual three-dimensional view. In the view of FIG. 12 it can be seen that the development relates to an improved definability and enlargement of the stimulated three-dimensional area between the end sections of the plurality in the second section 154-2 of the line 154 and in the second section of the line 144. From the primary-bore conduit 154, a plurality of secondary conduits 158 branching out from the cased primary well 158-1 148-1 branch off as branched horizontal bores (secondary bores).

have been carried on. As can be seen from FIG. 12, the plurality of

Thin holes 158-2 at least in pairs substantially parallel to each other to near the previously formed from a vertical primary bore,

in accordance with the ordinarily developing line 142 and in the vicinity of the line 142 in pairs parallel to each other and in pairs in different depths measured along the line 142 out. In the region defined along the conduit 142 by the plurality of pairs of end portions of the bores 158-2, outgoing branch bores 143 are respectively formed in an arcuate shape from the conduit 142 opening according to the directions, so that the arcs of the plurality

Branch bores 143 extend substantially in a common vertical plane containing the conduit 142, the plane, as can be seen from Fig. 12 and in Fig. 1 1 is even better seen, a plane of symmetry with respect to the end portions of the lines 158-2 , In each case for pairs of parallel outgoing end portions of the lines 158-2 is hydraulically stimulated. The resulting from the arrangement of the respective pairs of two pressure waves pressure field lines 1 17 are shown in Figures 1 1 and 12. At least in the of the pressure field lines 1 17

captured, three-dimensional space area becomes the first usable area 1 10

formed, as shown in Figures 1 1 and 12. The branch bores 143 are piped and provided with a plurality of holes (perforations), so that through these holes created a Gesamtströmströmfläche with a relatively large total inflow and a larger surface extent within the plane of symmetry for the inflow into the branch lines 143 and in the

Sole of the vertical bore 142 is formed. The education of the

End portions of the lines 158-2 achieved larger spatial extent of the first usable area 1 10 and the enlarged through the densely perforated branch bores 143 and further distributed inflow is in operation with circulating

Heat exchange fluid achieves better fluid communication with higher permeability and improved thermal energy transfer efficiency in the first usable region 110. In the same way can also stimulate the second usable

Range 120 can be improved. The embodiment shown in FIGS. 11 and 12 with the aim of improved stimulation and enlargement of a usable area to be artificially formed can, of course, apply not only to the end sections of the thin bores in FIGS. 11 and 12, but in general to all (FIGS. approximately substantially vertical) fluid communication conduits, such as conduits 44 and 54 in Figs. 1 to 4, conduits 144 and 154, respectively, in Figs. 5 to 8, and also for those shown in Figs. 3 and 4, cross-linking fluid communication lines 46 are used.

In the embodiment of a system for generating geothermal energy shown in FIG. 13, the system 200 includes a first one Development site 240, one of the first development site 240 associated usable area 210, a second development site 250, one of the second

Development site 250 assigned usable area 220, a third

A development site 260 and a usable area assigned to the third development site 260. In this system 200, the first usable area 210 and the second usable area 220 are connected to each other twice in a non-compliant manner, and in a manner to be referred to as parallel networking, the first usable area 210 and the third usable area 230 are double not associated with each other.

More specifically, system 200 includes a first associated fluid communication line 242 between first usable area 210 and first access location 240, a first unassigned fluid communication line between first access location 240 and second usable area 220, a second fluid connection line in between the second usable area 220 and the second development site 250, and a second unassociated fluid communication line between the second development site 250 and the first usable area 210. Through the aforementioned fluid communication lines 242, 248, 252 and 254, the first 210 and the second 220 usable range according to the embodiments shown in FIGS. 5 to 7 doubly non-improperly

connecting with each other.

Furthermore, the system 200 includes a third one according to the instructions

opening fluid connection line between the third usable area 230 and the third development site 260, a third non-assigned

opening fluid communication line 268 between the third access location 260 and the first usable area and a fourth unassociated fluid communication line between the first access location 240 and the third usable area 230. By means of the foregoing

Fluid connection lines 260, 268 and 269 and the fluid connection line 242 are the first 210 and the third 230 usable range also according to the embodiments shown in Figs. 5-7 double non-improperly connected to each other.

By means of connections which do not open according to a double assignment, therefore, the first and the second usable area 210 and 220 and in one (Circuit technical) sense parallel to the first usable area and the third usable area 210 and 230 connected to each other.

The first to fourth unauthorized inferring

Fluid communication lines 248, 254, 268 and 269 are each formed in two sections, the first section each consisting of a vertical bore extending from a respective development site into the depth and near the respective one

Each of the second portion is branched off from an end portion located in the vicinity of each usable area, and in depth in a substantially horizontal direction to the adjacent double-diagonal mesh Useable area to be included leads, cf. to Fig. 13. The first section 248-1 of the first unauthorized inferring

The fluid communication line 248 and the first portion 269-1 of the fourth unassociated fluid communication line are formed as a shared portion and extend from a first well 240 into the vicinity of the first usable region 210

Vertical bore formed. From this vertical bore, the two second sections 248-2 and 269-2 of the non-improperly opening fluid connection lines 248 and 269 branch off at depth in a branch region.

At the first development site, a heat exchange device 280 is arranged. At its fluid inlet 282 is the ground surface-side starting section of the first fluid connection line 242 opening according to the instructions

connected. At the fluid outlet 284 of the heat exchange device 280, the earth surface side end portion of the common first portion 248-1 and 269-1 of the first and fourth non-improperly opening

Fluid connection line 248 and 269 connected. At the second

1) and the third development site 260 are each provided with connection means (not shown in FIG. 13 and not designated) for interconnecting the fluid in the two "parallel" non-compliant interconnections Double unassigned connection, which has been explained above with reference to Fig. 13, it is not relevant whether the

Connecting device as a mere conveying and pumping station or additionally as Heat exchange device, each with or without solar collector device is configured.

It will be appreciated that in the system 200 shown in Figure 13, in addition to the second and third usable areas 220 and 230, there are still third or more usable areas each in a double diagonal-networked manner parallel to each other and parallel to the two usable areas 220 and 230 can be connected to the first usable area 210. In other words, not only two but also three or more usable regions can be connected or networked parallel to one another in a double-diagonal-networked manner with the first usable region.

In the embodiment of a system for generating geothermal energy shown in FIG. 14, the system 300 includes three (first, second and third) development sites 340, 350, 360 and three (first, second and third) usable regions 310, 320 and 330, each assigned to a development site. The system 300 further includes a first associated fluid communication line 342 between the first usable area 310 and the first access location 340, a first unassigned fluid communication line 348 between the second usable area 320 and the first access location 340, a second one as assigned

opening fluid communication line 352 between the second usable area 320 and the second development site 350, a second non-improperly opening up fluid communication line 358 between the third usable area 330 and the second development site 350, a third according to the third

opening fluid communication line 362 between the third usable area 330 and the third development site 360 and a third unassociated fluid communication line 368 between the first usable area 310 and the third development site 360. By the foregoing

Fluid connection lines are the second usable area 320 and the first usable area 310 connected in a double-diagonal-network manner, the third usable area 330 and the second usable area 320 also connected in a double-diagonal-network manner, and the first usable area 310 with the third usable area 330 also connected in a double diagonal-networked manner. In contrast to the embodiment shown in FIG. 13, in the embodiment shown in FIG. 14, the three usable regions 310, 320 and 330 connected in a (circuitry-wise speaking) ring-like manner and in each case "connected in series" behind one another, in particular connected diagonally in a double network.

It is obvious that in Fig. 14 shown annular serial (each double diagonal-crosslinked) networking one or more other usable areas can be incorporated in a serial manner.

It is also apparent from a consideration of FIG. 14 together with FIG. 13 that from each of the three development sites 340, 350, and 360 shown in FIG. 14, two or more usable regions are respectively parallel to each other with one of the accesses shown in FIG 14, sites 340, 350, and 360 can be networked (in particular, non-mismatched, but not mismatched).

It will also be apparent upon viewing FIG. 13 that from each of the access sites 240, 250, and 260 shown in FIG. 13, there are two or more other usable areas each having the respective ones shown in FIG

Can be networked in parallel manner or that each of the development site shown in Fig. 13 240, 250 and 260 is integrated into a ring-like in each case in series one behind the other

"Switched" (that is double diagonal-networked) variety of other usable areas can be networked.

By means of parallel or ring-like serial networking, it is thus also possible to form a multiplicity of complex networks of networks between usable areas.

In the embodiment of a system 400 shown in FIG

Opening up or producing geothermal energy, two usable regions 420 and 430 are networked directly and in parallel with each other with a usable region 410. Specifically, the system 400 includes a first development site 440, a first usable area 410, a second usable area 420, a third usable area 430, a first accessibly opening

Fluid communication line 442 between the first usable area 410 and the first enclosure 440, a first unassigned fluid communication line 450 between the first development site 440 and the second usable area 420, a second unassociated fluid communication line 452 between the first development site 440 and the third usable area 430, a first cross-linking fluid communication line 454 between the second usable area 420 and the first usable area 410 and a second crosslinking fluid connection line 456 between the third usable area 430 and the first usable area 410. At the first

Disclusion site 440 is a heat exchange device 480 with its fluid inlet 482 to the earth surface side initial portion of the accord

opening fluid connection line 442 and with its fluid outlet 484 to an earth surface side initial section of a common first section 450-1, 452-1 of the first and second non-improperly opening

Fluid connection lines 450 and 452 connected. In this way, a first circulatory system for a heat exchange fluid circulating in operation is closed by incorporating the second and first usable regions 420 and 410, and also a second circulatory system is closed by incorporating the third and first usable regions 430 and 410 , The two aforementioned circulation systems are formed (in a "circuit" manner) parallel to each other in the same sense as in Fig. 13, a second and a third usable region 220 and 230 are mutually parallel to one another at the first usable region 210 in parallel. The two aforementioned circulation systems comprise, as common elements, the fluid connection line 442, which opens according to the instructions

Heat exchange device 480 and the common first portion 450-1, 452-1 of the two unassociated opening of the fluid connection lines 450 and 452nd

In order to produce the system 400, a vertically inwardly directed development bore 470 was produced from a second development site 490, wherein an end section of the development bore 470 is formed as a blind bore. From a branch section 493, a second branch bore 472 has been produced, which has been led into the second usable region 420. From the branch section 493, a third branch hole 473 is branched off and guided into the third usable area 430. Finally, starting from the branch section 493, a first branch bore 471 is still made. The first

Branch bore 471 has a predetermined length to its end (in Fig. 15 at 76), from where it is in the form of multiple thin bores in a in the

Substantial horizontal direction is continued into the first usable area 410 inside. Of course, the opening bore 470, the first, second and third branch bores 471, 472, 473, and the first branch hole 471 extending several thin bores, which are led into the first usable area 410, all cased.

A first feed pump 61 is inserted and installed in the casing opening bore 470 downstream of the branch portion 493. A second feed pump 60 is in an end portion in the depth of the assigned

opening and installing fluid connection line 442. A

Pipe sealer (a packer) 63 is inserted and installed in the cased containment hole 470 uphole with respect to the branch portion 493. A first filter 67 is in the first branch bore 471 of the second

Development site 490 introduced and installed through the access hole 470. A second filter 66 is in the ground surface side initial portion of the common first portion 450-1 and 452-1 outgoing from the first development site 440 of the first and second non-improperly opening ones

Fluid connection line 450 and 452 introduced and installed. The filters 66 and 67 serve to retain (filter out) any solid constituents contained in the circulating heat exchange fluid circulating during operation which may have been flushed out of the circuit sections within the useable areas.

In the system 400 thus formed now includes the first networking

Fluid connection line 454 the cased second branch bore 472, the

Branch portion 493 of the opening hole 470, the cased first

Abzweigbohrung 471 and the end of which (at 76) continued, several cased thin bores, which are led into the first usable area 410. The second cross-linking fluid communication line 456 includes the cased third branch bore 473, the branch portion 493 of the opening bore 470, the cased first branch bore 471 and the plurality of thin bores continued from their end (at 76) into the first usable area 410.

The cased development hole 470 is closed at its ground surface side start portion with a line shutter 499. If necessary, to clean or replace the first filter 67 or the first feed pump 61, the operation may be interrupted, the pipe seal device 63 may be removed, and then the required maintenance or replacement work may be performed on the feed pump 61 or the filter 67. Thereafter, the shutter 63 may be reinserted and installed, and the ground surface side starting portion of FIG cased development hole 470 are closed with the line closure 499. Thereafter, the operation can be resumed.

In the embodiment of a system 500 shown in FIG

Opening up or producing geothermal energy, two usable areas 510 and 520 are connected to each other in a double non-compliant manner. In contrast to the embodiments of two usable regions, which are disclosed in FIGS. 5 to 7 in a non-randomly assigned manner, in the embodiment shown in FIG. 16, the associated connections are disclosed

Fluid connections and the unassociated inaugurate fluid connections each from a guided from the corresponding development site from

Horizontal drilling made.

Specifically, the system 500 includes a first development site 540, a first usable area 510 associated with the first development site 540, a second development site 550, a second usable area 520 associated with the second development site 550, a first horizontal well 542-H from the first A second horizontal well 544-H, which also starts from the first development site 540 and is led into the second usable region 520, has a third horizontal bore 552-H, which has been introduced into the first usable area 510. which is led from the second development site 550 into the first usable area 510 and a fourth horizontal bore 554-H, that of the second

Development site 550 is led out into the second usable area 520.

With regard to their functions in the circulating system for circulating in operation heat exchange fluid or in the networking architecture is from the first

Horizontal bore 542-H a first associated opening fluid connection line between the first usable area 510 and the first development site 540, from the second horizontal bore 544-H a first non-according to

from the fourth horizontal bore 554-H, a second associated fluid communication line between the second usable area 520 and the second development site 550, and the third horizontal bore 552-H, a second non-mismatched fluid communication line between the second usable area 520 and the first development site 540; disclosive

Fluid connection line between the first usable area 510 and the second development site 550 made. The system 500 further includes a heat exchange device 580 disposed at the first containment site 540 having a fluid inlet 582 and a fluid outlet 584. Attached to the fluid inlet 582 is the first one serving as production conduit for the first usable area 510

Fluid connection line connected. To the fluid outlet 584 is a

Beginning portion of the injection line in the second usable area 520 serving first non-improperly opening fluid connection line connected. At the second development site 550 is a

Connecting means 590 with a fluid inlet 592 and a fluid outlet 594 arranged. Connected to the fluid inlet 592 is an earth surface side initial portion of the second associated fluid communication line serving as a production well for the second usable area 520. To the

Fluid outlet 594 is an earth surface side starting portion of the

Injection bore in the first usable area 510 serving second non-improperly opening fluid connection line connected.

In the manner described above, in the system 500 in the

Substantially closed circuit system for a circulating in operation 500 heat exchange fluid set up. The circulatory system comprises the following successive successive sections: those from the second

Horizontal well 544-H prepared first cross-linking fluid communication line that leads from the first development site 540 into the second usable area 520, which produced in the second usable area 520

A fluid communication link through the geological formation from the end portion of the first unassociated fluid communication line to the end portion of the second directly communicating fluid communication line, the second associated connection line, the connector 590, the second unassociated fluid communication line extending from the second access point 550 to the second first usable area 510

leading the fluid communication connection through the geological formation between the end portion of the second unassociated fluid communication line to the end portion of the first directly opening one

Fluid connection line, the first direct opening fluid connection line and the heat exchange device 580th The embodiment shown in FIG. 16, because of the horizontal bores used, allows the first development site not to be located substantially vertically above the first usable region 510, but also horizontally displaced with respect to the first usable region 510 (FIG. and, of course, also with respect to the second usable area 520). Likewise, it permits the one shown in FIG

Embodiment that also the second development site 550 in horizontal

Direction or laterally with respect to the second usable area 520 (and of course with respect to the first usable area 510) may be set offset.

It will be appreciated that the double diagonal crosslinking formed by horizontal bores 542-H, 544-H, 552-H, and 554-H may also be extended to include a third or more useful areas in the interconnectivity

integrate. In this case, the integration of the third and the other usable

Regions each in parallel or in a ring-like manner serially

one behind the other in the network as shown in Fig. 16, connected or

be involved.

The embodiment shown in FIG. 17 is illustrative of a more generalized system 600 comprising: a first usable area 610, a first first drainage site 640 associated with the first usable area, a heat exchange device 680 disposed at the drainage site 640, a first associated fluid communication line 642 between the first usable area 610 and the first development site 640, and two, three, four, five, six, or even more development arms 605-1, 605-2, 605-3, parallel to each other and each with the first usable area 610 and the first one

Development site 640 are networked. Each of the accession arms 605-1, 605-2, 605-3 substantially represents a system similar to the system 400 shown in FIG. 15. In such a system (the system of each of the accession arms), from a first development site (FIG. 440 in Fig. 16, 640 in Fig. 17) in a parallel manner two usable areas, namely a second and a third usable area (420 and 430 in Fig. 15 and 620-1 and 630-2 in Fig. 17) directly and connected in parallel with each other with a first usable area (410 in Fig. 15 and 610 in Fig. 17). This networking is done using a

Development well (470 in Fig. 15, 694-1, 694-2, 694-3 in Fig. 17), from which two (it could also be three, four, five, six or more) usable areas (420, 430 in FIG. 15; 620-1, 630-1, 620-2, 630-2, 620-3, 630-3 in Fig. 17) each in parallel with each other and with a common in a subsection, cross-linking

Fluid communication line (472, 473 in Fig. 15, 646-1, 646-2, 646-3 in Fig. 17) and provided in a corresponding number, each "parallel" extending, non-improperly opening fluid connection lines parallel to each other and directly with the first usable area (410 in Fig. 15, 610 in Fig. 17) are networked.

It is obvious that each of the "outer" usable areas 620-1, 630-1, 620-2, 630-2, 620-3, 630-3 is the starting point for a plurality (two, three, four or more) of parallel (not shown in Fig. 17), it being obvious that each of the "outer" usable regions 620-1, 630-1, 620-2, 630-2, 620-3, 630-3 may be a "station" in a plurality (two, three, four or more) of annular serially-networked usable areas (not shown in Fig. 17).

Advantages of directly or indirectly interconnecting a second or more usable areas with a first usable area are summarized below.

1. The inventive concept of (directly or indirectly) interconnecting two or more usable areas may be implemented with existing (modern) drilling technology, existing casing technology, existing casing technology (in English Technical language: well completen technology) and possibly existing ones

Stimulation technology can be realized.

2. The return or reinjection of the depth from a through

Production line serving, associating opening fluid connection line promoted heat exchange fluid through the heat exchange device in a non-improperly opening fluid connection line is carried out by substantially horizontally extending holes in the ground at depths with less heat loss than on the earth's surface

3. At least in the so-called second sections described above, which in practice may be implemented as horizontal secondary bores, for example

Heat loss, as described, in the sections between the usable areas, where Temperatures in the range of about 80 ° Celsius to about 180 ° Celsius or more, even an additional heat energy absorption efficiency can be achieved. Of course, the depth of and distances between usable areas must be pre-planned.

4. If a connection device or a heat exchange device (such as a power plant) is additionally equipped with solar collectors at the earth's surface, heat loss in the line sections, where the formation temperature is lower than the temperature of the circulating heat exchange fluid, may be less than the additional one

Heat energy uptake efficiency in the (e.g., substantially horizontal) pipe sections between the useable areas.

5. When directly linking two or more usable areas, the

Heat energy absorption efficiency (thermal efficiency) are significantly increased compared to the usual practice of opening up only one usable area of a development site.

6. Man-made (i.e., hydraulically induced cracking) -purified useful regions can have a very large, nearly any extent, limited only by the range of cracking, and very high permeability. Due to the networking and production of several usable areas, it is sufficient to produce shorter crack or fissures in each of the produced usable areas than if - as hitherto - only one usable area is produced. This reduces the risk of loss of water (waterflooding) to distant, permeable formations and can be virtually completely eliminated by appropriate planning.

7. The number of directly or indirectly crosslinkable, artificially (ie by hydraulically induced cracking) stimulated useful areas can be increased almost arbitrarily, such as by the above-described parallel networking of two or more (about n> 2) usable areas and / or by annular-serial networking of several (about m> 3) usable areas.

8. In stimulated usable areas, the thermal energy uptake efficiency is also a function of the contact area between the rock matrix and the circulating

Heat exchange fluid (water). The contact surface can be increased almost arbitrarily by hydraulic fracturing methods (English: hydraulic fracing).

9. In both direct and indirect networking (such as with double cross-linking) of two usable areas, it is possible to control the distance between the useable areas and the distance between the drill holes of an injection well and a production well due to the routing of the cross-linking fluid communication lines in the subsurface in the depth at sufficiently high temperatures - substantially without increasing any heat loss almost arbitrarily. 10. In both direct and indirect networking, it is of course also possible to integrate several natural (permeable) usable areas with geothermal energy into a network in addition to artificially generated usable areas - and / or also instead of artificially generated usable areas or to network and thus to use.

1 1. In both direct and indirect networking, it is obviously possible to provide only one heat exchange device on the surface of the earth (e.g., just one power plant) for power generation from multiple usable areas and thus save costs.

12. However, where it makes sense or is desirable to efficiently distribute the energy gained - such as when several geothermal areas are interconnected and used by several operators or communities - several heat exchangers (power plants) can be set up.

13. If several development sites are provided, it is also possible to set up, for example, a power plant at a development site and, for example, a heat exchange facility for the supply of energy supply to a district heating distribution network at another development site.

14. If several development sites are provided, it is also possible, in each case at a first and a second development site, a heat exchange device for

Transferring geothermal heat energy into a heat transfer fluid to supply in a district heating distribution network from two or more district heating operators or two or more communities.

15. By networking multiple usable areas in a direct and / or indirect way, the following additional advantages in relation to projects in hydrothermal geothermal energy are achieved, which - as usual - only open up a geothermally usable area:

A. It is expected that by networking multiple usable areas according to the first and second aspects of hydrothermal geothermal energy projects can be realized in up to 90% of the earth's crust at depths of up to 6000 m, and with conventional hydrothermal geothermal only in up to 2% of the earth's crust.

B. Efficiency and longevity of projects with multiple networked, usable areas can be planned and pre-calculated in the planning phase. In contrast, for conventional hydrothermal and projects and for HDR projects the efficiency and lifetime are usually known only at the end of the project.

C. It is generally expected that by means of networking of several usable

Areas according to the first and second aspect of the present invention in the hydrothermal geothermal reduces the risk of a project and increases its lifetime.

16. Networking of multiple usable areas in hydrothermal geothermal energy will also bring benefits to projects based on the principle of "hot-dry-rock" (HDR) geothermal energy and, as has been the case to date, a geothermal HDR area open:

A. Opportunities for success in economically viable hydrothermal geothermal projects with multi-use networking can be made consistently superior to conventional so-called Hot Dry Rock (HDR) through appropriate planning, including, in particular, the choice of the number of networked usable areas. projects.

B. The risk of water flooding is reduced and can be eliminated almost completely.

C. Stimulation (hydraulically induced cracking) can be reduced to smaller

Dimensions (length and width) are minimized.

D. The production time for a usable area can be increased and a

Regeneration of the geothermal usable area can be made significantly shorter, easier, more successful, and less expensive. In favorable cases, even a permanent production can be set up and regeneration phases can be avoided.

Q. Hydraulic efficiency is expected to be significantly higher (twice as likely) than in HDR projects.

G. Efficiency and longevity of a project with direct and indirect networking of two or more usable areas can be pre-calculated and planned in the planning phase.

17. By using cased containment wells, clusters of useable areas can be created by means of the depth of the access wells

Branch drills, which are guided with their end sections into the usable areas belonging to the cluster. Cross-linking fluid communication lines can achieve quite extensive subsurface interconnections from a large number of usable areas from very few, especially only from a development site, to underground cross-linking fluid communication lines, see for example Fig. 17. Therefore, the heat energy transfer efficiency can be very high, the heat energy extraction From a single usable area kept relatively low and so the production time extended with little to no regeneration needs or even permanently established. LIST OF REFERENCE NUMBERS

1, 2, 3, 4 system

5 earth surface

6 underground

8 deep underground for hydrothermal geothermal energy

10 first usable area

12 zone

14 maximum distance

18 initial fracture propagation direction

20 second usable area

24 maximum conveying distance

28 Initial crack propagation direction

30 third usable area

38 initial crack propagation direction

40 first development site

42 first associate opening fluid connection line

44 non-compliant fluid communication line

44- 1 first section

44-2 second section

45- 1, 45-2, 45-3 thin bore

46 cross-linking fluid connection line

47 branch area

48- 1 primary hole

48-2 secondary drilling

49- 1, 49-2, 49-3 thin bore

60, 61 Feed pump (piping, English downhole pump)

62 diaphragm

63, 64 Pipe sealing device (English: packer)

65 Pipe sealing device in cased thin bore

66, 67 filters

68, 68 'perforation

69 Perforation in cased thin bore

80 heat exchange device

82 fluid inlet

84 fluid outlet

86-1, ..., 86-12 Flow direction (in the circulatory system) 90 second development site

91 connection hole

92 second associate opening fluid connection line

93 branch section

94 connection

94-1 first section

94- 2 second section

95- 1, 95-2, 95-3 thin bore

96 transition area (English: liner)

97 branch hole

98 piping

99 pipe closure

100, 100 "'system

1 10, 1 10 'first usable area

1 18 initial fracture training (English: frac) direction

1 18-H Initial Crack Formation Direction (from Horizontal Hole)

120, 120 'second usable area

127 initial crack formation direction

(from horizontal secondary bore 148-2)

128 initial crack formation direction (from drilling brine)

128-H Initial Crack Formation Direction (from Horizontal Hole)

129 crack (English: fracture)

140 first development site

141 piping

142 first associate opening fluid connection line

142-H first fluid connection line opening according to the order (from horizontal drilling)

143 Divergence section

144, 144 'first unassociated opening fluid connection line 144-1 first section

144-2, 144-2 'second section

144-H first non-compliant fluid communication line

(from horizontal drilling)

145 Convergence section

146 branch hole

147 branch area

148-1 primary hole 148- 2 Secondary drilling

149-1, 149-2 thin bore

149-3, 149-4 thin bore

150 second development site

152 second associate opening fluid connection line

152-H second fluid connection line opening according to the order (from horizontal drilling)

154, 154 'second unassociated opening fluid connection line

154-1 first section

154-2, 154-2 'second section

154-H second unassociated opening fluid connection line

(from horizontal drilling)

158-1 primary hole

158-2 Secondary drilling

170 second heat exchange device

190 connection device

191 conveying and pumping station

192 fluid inlet

194 fluid outlet

195 Conveying, pumping and heat exchange station

196 solar energy collector device

200, 200 'system (with parallel networking)

210 first usable area

220 second usable area

230 third usable area

240 first development site

242 first associate opening fluid connection line

248 first unassociated opening fluid connection line

248-1 first section

248-2 second section

250 second development site

252 second associate opening fluid connection line

254 second unassociated opening fluid connection line

254-1 first section

254-2 second section

260 third development site

262 third associate opening fluid connection line 268 third unassociated opening fluid connection line 268-1 first section

268- 2 second section

269 fourth unassociated opening fluid connection line 269-1 first section

269- 2 second section

280 heat exchange device

282 fluid inlet

284 fluid outlet

286-1, ... 286-12 Flow direction (in the circulatory system)

300 system (with serial networking)

310 first usable area

320 second usable area

330 third usable area

340 first development site

342 first associate opening fluid connection line

348 first unassociated opening fluid connection line

348-1 first section

348-2 second section

350 second development site

352 second associative opening fluid connection line

358 second non-compliant fluid connection line

358-1 first section

358-2 second section

360 third development site

362 third associate opening fluid connection line

368 fourth unassociated fluid communication line

368-1 first section

368-2 second section

380 heat exchange device

382 fluid inlet

384 fluid outlet

386-1, ... 386-10 Flow direction (in the circulatory system)

400 system (with serial networking)

410 first usable area

420 second usable area

430 third usable area 440 first development site

442 first associate opening fluid connection line

450 first unassociated opening fluid connection line

450-1 first section

450-2 second section

452 second non-compliant fluid communication line

452-1 first section

452-2 second section

454 first cross-linking fluid communication line

456 second cross-linking fluid communication line

470 development well (cased)

470-1 first branch section (cased)

470-2 second branch section (cased)

470-3 third branch section (cased)

471 first branch hole

472 second branch hole

473 third branch hole

493 branch section

499 drill pipe closure

500 system

510 first usable area

520 second usable area

540 first development site

542 first associate opening fluid connection line

542-H first horizontal bore

544 first unassociated opening fluid connection line

552-H second horizontal bore

550 first development site

552 first associate opening fluid connection line

552-H third horizontal bore

544 second non-compliant fluid connection line

554-H fourth horizontal bore

580 heat exchange device

582 fluid inlet

584 fluid outlet

590 connection device

584 fluid inlet 585 fluid outlet

600 system

605-1 first development arm

605-2 second development arm

605-3 third development arm

610 first usable area

620-1 second usable area (in the first development arm)

630-1 third usable area (in the first development arm)

620-2 second usable area (in the second development arm)

630-2 third usable area (in the second development arm)

620-3 second usable area (in the third development arm)

630-3 third usable area (in the third development arm)

640 first development site

642 first associate opening fluid connection line 644 first non-improperly opening fluid connection line

646 first cross-linking fluid communication line

648- 2-1 second section of the first according to the accrual

Fluid connection line in the first development arm

649- 2-1 second section of the second according to the assigning

Fluid connection line in the first development arm

648-2-2 second section of the first according to the ordinarily available

Fluid connection line in the second development arm

649-2-2-2 second section of the second attribution

Fluid connection line in the second Verschließungsarm 648-2-2 second section of the first zuordnungsgemäß opening

Fluid connection line in the third development arm

649-2-1 second section of the second according to the ordinarily available

Fluid connection line in the third development arm

680 heat exchange device

682 fluid inlet

684 fluid outlet

694-1 first cased development well

694-2 second cased development well

694-3 second cased development well

o1 strongest geomechanical stress component

02 medium-strong geomechanical stress component

03 weakest geomechanical stress component

Claims

Patent claims

1 . System (1; 2; 3; 4; 100-100 "'; 200; 300; 400; 500; 600) for unlocking or

Producing geothermal energy, with:

a first subterranean, useable area (10; 1 10; 210; 310; 410; 510; 610) with geothermal energy,

a predetermined first development site (40; 140; 240; 340; 440; 540; 640) associated with the first usable region, and

a first associated fluid communication line (42; 142; 242; 342; 442; 542; 642) formed between the first development site and the first usable region,

marked by

at least one second subterranean usable area (20; 120; 220; 320; 420; 520; 620; 30; 130; 230; 330; 430; 630-1, 630-2) with geothermal energy, and

a first unassociated fluid communication line (44; 144; 244; 344; 444; 544; 644) formed between the first development site and the second usable region.

2. System according to claim 1, characterized in that

the second usable area directly or indirectly with the first

Connected to the first usable area.

3. System (1, 400, 600) according to claim 1 or 2, characterized in that

there is a heat exchange device (80; 180; 280; 380; 480; 580; 680) provided at the first access location (40; 140; 240; 340; 440; 540; 600) having a fluid inlet (82; 182; 282; 382; 482; 582; 682) and a fluid outlet (84; 184; 284; 384; 484; 584; 684), the first being according to the invention

Fluid communication line (42; 142; 242; 342; 442; 542; 642) is connected to the fluid inlet and the first unassociated fluid communication line (44; 144; 244; 344; 444; 544; 644) is connected to the fluid outlet.

4. System (1, 400, 600) according to claim 2 or 3, characterized in that

the second usable area (20; 420; 620) immediately adjacent to the first

Networked site (80; 480; 680) and the first usable area (10; 410; 610), to which the system (1, 400, 600) further a first cross-linking

Fluid communication line (46; 446; 646) formed between the second usable area (20; 420; 620) and the first usable area (10; 410; 610).

5. System (1, 400, 600) according to claim 4, characterized in that

the first unassociated fluid communication line (44; 444; 642), the second usable region (20; 420; 620), the first crosslinking one

Fluid communication line (46; 446; 646), the first usable area (10; 410; 610), the first associated fluid communication line (42; 442; 642), and

Heat exchange device (80; 480; 680) form a substantially closed, in particular pressure-tight closed heat exchange fluid circulation system for a heat exchange fluid circulating therein during operation of the system (1; 400; 600).

6. System (400; 600) according to one of claims 2 to 5, characterized in that

the second usable area (420; 620) immediately adjacent to the first

Networked site (480, 680) and the first usable area (610),

that the system further comprises at least one further third usable area (430; 620-1) or even further (total: m) usable areas, where m is a natural number and 3 <m, and

in that the second (420, 620) and every further mth usable regions are each directly networked to the first development site (440, 640) and the first usable region (610), whereby a so-called parallel and direct networking of the m usable regions the first usable area is formed.

The system (400; 600) of claim 6, wherein the system (1,400; 600) for directly networking the second usable area comprises the first network

Fluid communication line (46; 446; 646) formed between the second usable area (20; 420; 620) and the first usable area (10; 410; 610), and wherein the system (1, 400; 600) for directly interconnecting each of the further m usable areas, a (m-1) -th crosslinking fluid communication line (444, 446; 648-1, 649-1, 648-2, 649-2, 648-3, 649-3), formed between the m-th usable area (20; 420; 620-1, 630-1, 620-2, 630-2, 620-3, 630-3) and the first usable area (10; 410; 610) is included.

8. System (400; 600) according to claim 7, characterized in that each two or more of the m-1 crosslinking fluid communication line (444, 446; 648-1, 649-1, 648-2, 649-2, 648-3, 649-3) comprise a common conduit section.

The system (100, 200, 300, 500) according to claim 2 or 3, characterized in that the second usable area (120; 220; 320; 520) is indirectly connected to the first one

Networked site (140; 240; 340; 540) and the first usable area (1 10; 210; 310; 510),

to which the system (100, 200, 300, 500) further comprises:

a predetermined second development site (150; 250; 350; 550) associated with the second usable region (120; 220; 320; 520),

a second associated fluid communication line (152; 252; 352; 452; 552) formed between the second development site (150; 250; 350; 550) and the second usable region (120; 220; 320; 520), and

a second unassociated fluid communication line (154; 254; 354; 554) formed between the second development site (150; 250; 350; 550) and the first usable region (1 10; 210; 310; 510),

whereby a so-called double-cross networking of two usable areas and two associated development sites is formed.

10. System (100, 200, 300, 500) according to claim 9, characterized in that

one at the second development site (50; 150; 250; 350; 450; 550)

provided connection means (190; 290; 390; 590) having a fluid inlet (192;

292; 392; 582) and a fluid outlet (194; 294; 394; 594), the first associated fluid communication line (142; 242; 342; 542) communicating at the fluid inlet and the first unassociated fluid communication line

(144; 244; 344; 544) is connected to the fluid outlet.

1 1. System (100, 200, 300, 500) according to claim 2 or 3 and 10, characterized

marked that

the first unassociated fluid communication line (144; 244;

344; 544), the second usable area (120; 220; 320; 520), the second associated fluid communication line (152; 252; 352; 452; 552);

Connecting means (190; 290; 390; 590), the second unassociated fluid communication line (154; 254; 354; 554), the first usable area (1 10; 210; 310; 510), the first associated fluid communication line

(142, 242, 342, 542) and the heat exchange device (180, 280, 380, 580) a in

Essentially closed, in particular pressure-tight closed Heat exchange fluid circuit system for a heat exchange fluid circulating therein during operation of the system (100, 200, 300, 500).

12. System (200) according to claim 2 or 3 and 10 or 1 1, characterized in that

the second usable area (220) is networked indirectly with the first development site (240) and the first usable area (210),

the system further comprises at least one further third (230) or even further (total: m) usable regions, where m is a natural number and 3 <m, and

that the second (220) and each further mth (230) usable regions are each indirectly cross-linked to the first development site (240) and the first usable region (210), whereby a so-called parallel and indirect networking of m

usable areas with the first usable area is formed.

13. System (200) according to claim 12, characterized in that

to which the system (200) further comprises:

a predetermined second (250), third (260) or more (total: m)

Development sites, each of the second, third or further development sites being respectively assigned to the second (220), third (230) or mth usable region,

a second (252), third (262), or multiple (m: m in total) fluidly connecting conduits opening between the respective second, third, or m th development site and the second (220), third (230), or mth usable region are trained, and

a second (254), third (264), or more (in total: m) non-compliant fluid communication lines formed between the second (250), third (260), or m th development site and the first usable area (210) ,

14. System (300) according to claim 2 or 3 and 10 or 1 1, wherein

the second usable area (320) is indirectly networked with the first development site (340) and the first usable area (310), and characterized by:

at least one further third (330) or even further (in total: m) usable regions, where m is a natural number and 3 <m, and

at least one predetermined second (350), third (360) or even more

(Total: m) Development sites, each of the m development sites (340, 350, 360) being assigned to a usable area (310, 320, 330), and each being usable

Area (310, 320, 330) and each development site (340, 350, 360) one, the respective Assignment n is assigned to a n ordinal number, where n is a natural number and 2 <n <m, and

in addition to the first (n = 1) associated fluid connection line, at least one second (352), third (362) or even further (total: m) associated with opening fluid connection lines,

wherein the nth associated fluid connection line (358, 368) between the nth access location (350, 360) and the (n + 1) th usable area (320, 330) and the mth associated fluid communication line between the mth development site (360) and the first usable area (310) is formed,

whereby a so-called annular-serial networking of m usable areas is formed.

15. System (200, 300) according to one of claims 12 to 14, characterized in that

for at least one selected usable area (210, 220, 230; 310, 320, 330) from the group formed from the first to the m-th usable area and the access area (240, 250, 260, 340, 350 , 360):

(i) with this selected usable area and this area

associated development sites are two or more still further usable regions included in the system in addition to the m usable regions, either parallel and indirect or parallel and directly networked, or

(ii) this selected usable area and the development site associated with that area are involved in a circular-serial networking of two or more still usable areas usable in the system in addition to the m

Areas are included.

16. System (500) according to one of claims 1 to 15, characterized in that one of the following features is fulfilled:

(i) at least one of the associated connecting fluid connection lines (42,

142, 152) comprises a cased primary bore (48) extending from the respective development site (40; 140, 150) substantially vertically into the depth until it reaches the assigned usable area;

(ii) at least one of the associated connecting fluid connection lines (542, 552) comprises one of the respective development site (540, 550) outgoing and in

Essentially continuously formed into the assigned usable area (510, 520) in, piped horizontal bore (542-H, 552-H).

17. System (1, 2, 3, 4, 100, 200, 300, 400) according to one of claims 1 to 16, characterized in that one of the following features is fulfilled:

(i) at least one of the unassigned fluid communication conduits (154) comprises a cased bore formed in a first section extending from the respective enclosure (150) as a primary bore and in a second region adjacent the first section as a secondary bore in FIG the shape of one or more, preferably 6 to 12, horizontal bores, each having an end portion extending into the usable area to be opened,

(ii) at least one of the unassigned fluid communication lines (544, 554) comprises a cased outgoing from the respective development site (540, 550) and formed essentially continuously into the respective useable area (510, 520) to be developed Horizontal bore (544-H, 554-H).

18. System (3, 4, 400, 600) according to one of claims 1 to 17, characterized

marked that

at least one cross-linking fluid communication line (46; 444-1, 444-2) has one or more, preferably 6 to 12, piped horizontal bores (46; 446-) extending from a respective i-th usable area (520, 530; 644, 646); 1, 446-2) substantially continuous into a jth usable area (510; 610)

and each having an end portion which extends into the j-th usable region to be developed, where i, j, m and n are natural numbers with i <> j and i, j <m, where m = n - 1 is the number of crosslinking

Fluid connection lines and where n is the number of usable areas.

19. A method for generating or producing geothermal energy, comprising the following steps:

Identifying a first subterranean, useable area (10; 1 10; 210; 310; 410; 510; 610) with geothermal energy,

Determining a predetermined first development location (40; 140; 240; 340; 440; 540; 640) associated with the first usable region, and

Establishing a first associated fluid communication line (42; 142; 242; 342; 442; 542; 642) between the first development site and the first usable region,

marked by Identifying at least a second (20; 120; 220; 320; 420; 520; 620) or still further (30; 130; 230; 330; 430; 630-1, 630-2) geothermal energy subsurface areas, and

Producing a first unauthorized opening

Fluid communication line (44; 144; 244; 344; 444; 544; 644) between the first

Development site and the second usable area.

20. The method according to claim 19, characterized by

Networking the second usable area directly or indirectly with the first development site and the first usable area.

21. The method according to claim 19 or 20, characterized by

at the first development site (40; 140; 240; 340; 440; 540; 600), providing heat exchange means (80; 180; 280; 380; 480; 580; 680) having a fluid inlet (82; 182; 282; 382; 482; 582; 682) and a fluid outlet (84; 184; 284; 384; 484; 584; 684),

Connecting the first mated fluid communication line (42; 142; 242; 342; 442; 542; 642) to the fluid inlet, and connecting the first unassociated fluid communication line (44; 144; 244; 344; 444; 544; 644) the fluid outlet.

22. The method according to claim 20 or 21, characterized by

immediately networking the second usable area (20; 420; 620) with the first development site (80; 480; 680) and the first usable area (10; 410; 610), and

Forming a first cross-linking fluid communication line (46; 446; 646) between the second usable area (20; 420; 620) and the first usable area (10; 410; 610).

23. The method according to claim 20 or 21, characterized by

indirectly networking the second usable area (120; 220; 320; 520) with the first development site (140; 240; 340; 540) and the first usable area (1 10; 210; 310; 510),

Determining a second development site (150; 250; 350; 550) associated with the second usable region (120; 220; 320; 520),

Producing a second associatively opening fluid connection line

(152; 252; 352; 452; 552) between the second development site (150; 250; 350; 550) and the second usable region (120; 220; 320; 520), and Establishing a second unassociated fluid communication line (154; 254; 354; 554) between the second access site (150; 250; 350; 550) and the first usable area (1 10; 210; 310; 510);

thereby forming a so-called double-cross networking of two usable areas and two associated development sites.

24. The method according to claim 20 or 21, characterized by

indirectly crosslinking the second usable area (220) with the first one

Development site (240) and the first usable area (210),

Identifying at least one further third (230) or even further

(Total: m) usable areas, where m is a natural number and 3 <m, and networking the second (220) and each further m-th (230) usable area respectively indirectly with the first development site (240) and the first one usable area

(210), and

thereby forming a so-called parallel and indirect networking of m usable areas with the first usable area.

25. The method according to claim 20 or 21, characterized by

indirectly crosslinking the second usable area (320) with the first one

Development site (340) and the first usable area (310),

Identifying at least one further third (330) or even further (total: m) usable regions, where m is a natural number and 3 <m, and determining at least one second (350), third (360) or even further ( Total: m) Development sites, assigning each of the m development sites (340, 350, 360) to a usable area (310, 320, 330) and assigning it to each usable site

Area (310, 320, 330) and each access point (340, 350, 360) of an ordinal number n denoting the respective assignment, where n is a natural number and 2 <n <m, and

in addition to the first (n = 1) associated fluid communication line, establishing at least one second (352), third (362) or even further (total: m) associated with opening fluid interconnect lines,

Forming the nth associated fluid connection line (358, 368) between the nth access site (350, 360) and the (n + 1) th usable area (320, 330) and forming the m th associated fluid connection line between the mth development site (360) and the first usable region (310), thereby forming a so-called ring-serial networking of m usable regions.

26. The method according to claim 24 or 25, characterized in that it

for at least one selected usable region (210, 220, 230; 310, 320, 330) from the group formed from the first to the m-th usable region and the development site (240, 250, 260;

350, 360) comprises:

(ii) in addition to the m useable areas, identifying two or more still usable areas, and incorporating that selected useable area

Area and associated with this area development site in a ring-serial networking of the two or more still further usable areas.