CN115234210A - Hot dry rock alternate injection and production method and horizontal well exploitation pipe column structure - Google Patents
Hot dry rock alternate injection and production method and horizontal well exploitation pipe column structure Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 188
- 238000002347 injection Methods 0.000 title claims abstract description 141
- 239000007924 injection Substances 0.000 title claims abstract description 141
- 239000011435 rock Substances 0.000 title claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 17
- 238000005065 mining Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 2
- 206010017076 Fracture Diseases 0.000 claims 26
- 208000010392 Bone Fractures Diseases 0.000 claims 7
- 208000013201 Stress fracture Diseases 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
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- 238000011156 evaluation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention discloses a hot dry rock alternate injection and extraction method and a horizontal well exploitation tubular column structure, and relates to the technical field of hot dry rock exploitation, wherein the hot dry rock alternate injection and extraction method comprises the following steps: injecting liquid with first temperature and pressure into the annular space of the well completion pipe column and the production pipe column according to set injection pressure, entering a production horizontal well along the annular space, and entering an injection crack of the hot dry rock reservoir through an injection check valve of an injection unit; increasing the injection pressure until a set pressure threshold value is reached, stopping continuously injecting liquid into the annulus between the completion string and the production string, and carrying out heat exchange between the liquid entering the injection fracture and heat carried by the hot dry rock reservoir so as to generate a water-vapor mixture with a second temperature and pressure, wherein the second temperature and pressure is Wen Yagao; the water-vapor mixture injected into the cracks of the dry hot rock reservoir enters the well completion pipe string from the production cracks and then is lifted to the stratum through the production pipe string for utilization. The invention provides a safe, scientific and reasonable exploitation method for the efficient development of the hot dry rock by establishing the enhanced geothermal system.
Description
Technical Field
The invention relates to the technical field of hot dry rock mining, in particular to a hot dry rock alternate injection and mining method and a horizontal well mining pipe column structure.
Background
The definition of Hot Dry Rock (Hot Dry Rock, HDR) is continuously developed since the concept of Hot Dry Rock geothermal energy was proposed by Los Alamos national laboratory in the united states of america in the 20 th century and the 70 th generation, and the latest definition of Hot Dry Rock in geothermal energy term is an abnormally high temperature Rock body with no or only a small amount of fluid inside and a temperature higher than 180 ℃. It is conservative estimates that the energy contained in the hot dry rock (usually 3-10 km deep) in the crust is 30 times the energy contained in all global oil, gas and coal. The evaluation data of the Chinese geological survey bureau shows that the total amount of the hot dry rock resources at the depth of 3-10 km is 2.5 multiplied by 10 25 J (856 trillion tons of standard coal), if 2% can be mined, it is equivalent to 4400 times of total disposable energy consumption in 2015 years in China.
The development of conventional hot dry rock resources mainly utilizes an Enhanced Geotherm System (EGS) to extract heat inside the System. The enhanced geothermal system forms artificial cracks in underground deep low-permeability high-temperature rock bodies through engineering means such as hydraulic fracturing, water is injected through a recharging well, the injected water moves along reservoir cracks and joints or artificial crack networks and exchanges heat with surrounding rocks, and high-temperature high-pressure water or a water-vapor mixture is generated. After high-temperature steam is extracted from the production well to the ground, the high-temperature steam is used for power generation and comprehensive utilization through heat exchange and a ground circulating device. The utilized warm water is injected into the underground dry and hot rock body through the recharging well, so that the purpose of recycling is achieved. In order to improve the utilization rate of geothermal resources, hydraulic fracturing has become a key means for forming an enhanced geothermal system, but the reports on how to improve the cyclic utilization rate of geothermal resources through hydraulic fracturing are relatively few, and the commercial application of development of a dry-hot rock reservoir is restricted.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a dry and hot rock alternate injection and extraction method and a horizontal well exploitation tubular column structure.
In order to achieve the purpose, the invention can adopt the following technical scheme:
a hot dry rock alternate injection and production method comprises the following steps:
injecting liquid with first temperature and pressure into the annulus of the well completion pipe column and the production pipe column according to set injection pressure, entering a production horizontal well along the annulus, and entering an injection crack of the hot dry rock reservoir through an injection check valve of an injection unit;
increasing the injection pressure until a set pressure threshold value stops continuously injecting liquid into the annulus between the completion string and the production string, and performing heat exchange between the liquid entering the injection fracture and heat carried by the hot dry rock reservoir so as to generate a water-vapor mixture with a second temperature and pressure, wherein the second temperature and pressure is higher than the first temperature and pressure;
and the water-vapor mixture in the injection fracture of the hot dry rock reservoir enters the well completion pipe string from the production fracture and then is lifted to the stratum for utilization through the production pipe string.
The alternate injection and production method of the hot dry rock further comprises the step of adopting a lower seam control high-pressure cracking process for the injection cracks, wherein the lower seam height of the artificial cracks is controlled by using a sinking agent and a diverting agent, so that asymmetric vertical seams are formed, and the upper seam height is used for communicating the artificial seam network of the adjacent production cracks.
According to the alternate injection and production method of the hot dry rock, the sinking agent and the diverting agent are micro powder with the density higher than a set value, and a low-permeability artificial interlayer can be formed at the bottom of the crack, so that the downward extension of the artificial crack is controlled.
The alternate injection and production method of the dry hot rock further adopts a fracture network volume fracturing process for the production fracture, wherein on the basis of horizontal well fracturing transverse fractures, a diverting agent in the fracture is adopted to induce secondary microcracks to expand and extend so as to improve the swept volume of the artificial fracture network and provide larger heat exchange volume and heat exchange area.
The alternating injection and production method for the hot dry rock further comprises the step of arranging the injection fractures and the production fractures in a spatially staggered manner, wherein the injection fractures are located between two adjacent sections of the production fractures so as to communicate secondary microcracks in the production fractures by using the injection fractures.
In addition, the invention also provides a hot dry rock horizontal well exploitation tubular column structure, which comprises:
a production horizontal well having a horizontal section and at least the horizontal section disposed in the hot dry rock reservoir;
a completion string disposed within the production horizontal well and arranged along an extension direction of the production horizontal well; and the number of the first and second groups,
a production string disposed within and arranged along an extent of the completion string, wherein,
the production horizontal well is internally divided into a plurality of injection units and a plurality of acquisition units, liquid entering the production horizontal well leaves the production horizontal well from the plurality of injection units and generates a water-vapor mixture in the hot dry rock reservoir, and then enters the production string through the acquisition units and is taken away from the mining string structure.
The structure of the production string of the dry hot rock horizontal well is characterized in that the injection unit is at least partially in contact with an injection fracture, and the acquisition unit is at least partially in contact with a production fracture.
According to the production string structure of the dry hot rock horizontal well, the injection fractures and the production fractures are arranged along the horizontal section of the production horizontal well in a staggered mode.
The hot dry rock horizontal well exploitation tubular column structure further comprises two external pipe packers and injection one-way valves arranged in the two external pipe packers, and the injection unit with the injection one-way valves is in contact with the injection cracks.
The dry hot rock horizontal well exploitation tubular column structure comprises a production unit and a production unit, wherein the production unit comprises two external packers and production check valves arranged in the two external packers, and the production unit with the production check valves is in contact with production cracks.
Compared with the prior art, the invention has the beneficial effects that: according to the alternate injection and production method for the hot dry rock and the horizontal well exploitation tubular column structure, the enhanced geothermal system consisting of the injection cracks and the production cracks is established by utilizing the sectional differential fracturing of the horizontal well, and the alternate injection and production exploitation is implemented by matching with the well completion tubular column and the production tubular column, so that a safe, scientific and reasonable exploitation method is provided for the efficient development of the hot dry rock.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a dry hot rock horizontal well production string structure according to an embodiment of the invention.
Wherein: 1. producing a horizontal well; 21. a first production crack; 22. a second production crack; 23. thirdly, generating cracks; 31. a first injection fracture; 32. a second injection fracture; 4. secondary microcracking; 51. a completion string; 521. a first external pipe packer; 522. A second external casing packer; 523. a third external pipe packer; 524. a fourth pipe outer packer; 525. a fifth external casing packer; 531. A first production check valve; 532. a second production check valve; 533. a third production check valve; 541. a first injection check valve; 542. A second injection check valve; 61. producing an oil pipe; 62. the pump is lifted.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Example (b):
it should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience and simplicity of description only and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.
In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, the invention carries out staged differential fracturing on a production horizontal well 1, establishes an enhanced geothermal system consisting of injection fractures and production fractures, and cooperates with a well completion pipe column 51 and a production pipe column to carry out alternate injection-production exploitation, thereby providing a safe, scientific and reasonable exploitation method for the efficient development of hot dry rocks.
Referring to fig. 1, a hot dry rock alternate injection and production method may include the steps of:
(1) Injecting an annulus: and starting a ground high-pressure pump to inject water with lower temperature into the annular space between the completion string 51 and the production string according to the set injection pressure, and enabling the high-pressure water to enter the production horizontal well 1 along the annular space and enter the first injection fracture 31 and the second injection fracture 32 of the hot dry rock reservoir through the first injection check valve 541 and the second injection check valve 542 of the injection unit. In this embodiment, the injection check valve is a check valve that allows the water inside the pipe to flow outside the pipe and limits the water outside the pipe from flowing inside the pipe, so that the low-temperature water on the ground can be ensured to be injected into the formation. Meanwhile, the number of the injection check valves and the injection cracks can be determined according to actual working conditions.
(2) Stopping injecting and soaking the well: and after the injection pressure is increased until the set pressure threshold value, stopping continuously injecting liquid into the annular space between the completion string 51 and the production string, closing an injection valve of the annular space, and performing heat exchange between the low-temperature water entering the first injection crack 31 and the second injection crack 32 and the heat carried by the dry hot rock reservoir so as to generate a high-temperature high-pressure water-vapor mixture. In the embodiment, the low-temperature water entering the injection fracture and the hot dry rock reservoir rock are subjected to sufficient heat exchange, so that a high-temperature high-pressure water-vapor mixture can be generated by utilizing the heat of the hot dry rock reservoir, and support is provided for the development of subsequent work.
(3) Well opening and recovery: and opening a valve at the wellhead of the production string, allowing the high-temperature and high-pressure water-vapor mixture in the injection fractures of the hot dry rock reservoir to flow from the first production fractures 21, the second production fractures 22 and the third production fractures 23, pass through the first production check valve 531, the second production check valve 532 and the third production check valve 533, enter the completion string 51, and then pass through the production string to be lifted to the stratum for utilization. In this embodiment, the high temperature and high pressure water vapor mixture may enter the completion string 51 from the production fracture through the production check valve of the collection unit, and may be returned from the production string under the action of the lift pump 62 of the production string for power generation or comprehensive utilization. The production check valve is a check flow valve which allows the outside of the pipe to flow into the pipe and limits the flow in the pipe to flow out of the pipe, so that the steam produced by the stratum can flow into the well, and meanwhile, the number of the production check valve and the number of production cracks can be determined according to actual working conditions.
(4) Circulating injection and production: and (3) after the well is opened and the recovery is carried out to a certain degree, performing the second injection and recovery operation according to the steps (1) - (3), and recycling the warm water generated before power generation or after comprehensive utilization. In the embodiment, the heat of the hot dry rock reservoir can be more efficiently extracted and utilized by alternately injecting and extracting.
As an alternative embodiment, in some embodiments, the injection fractures employ a controlled lower fracture high fracturing process that utilizes a subsidence agent and a diverter to control the lower fracture height of the artificial fractures, thereby forming asymmetric vertical fractures, and utilizes the upper fracture height to open the artificial fracture network of adjacent production fractures. Furthermore, the sinking agent and the diverting agent are micro powder with the density higher than a set value, and a low-permeability artificial interlayer can be formed at the bottom of the crack, so that the downward extension of the artificial crack is controlled.
Specifically, the injection crack formed by the crack-controlling high-pressure fracture-reconstruction crack is a ground low-temperature water injection channel. The lower seam height of the artificial crack can be controlled by a sinking agent and a diverting agent in the fracturing process by adopting the lower seam height control fracturing modification, so that secondary microcracks 4 formed by adjacent production cracks are communicated by fully utilizing the upper seam height, and further, an effective communication seepage channel is established.
As an alternative embodiment, in some embodiments, the production fractures are produced by a fracture network volume fracturing process, which uses an intra-fracture diverting agent to induce the secondary microcracks 4 to extend and extend on the basis of horizontal well fractured transverse fractures, so as to increase the artificial fracture network swept volume and provide larger heat exchange volume and heat exchange area.
In this embodiment, the fracture network volume fracturing reforms the production fracture that the fracture formed, provides the passageway for stratum high temperature steam output. The production cracks are transformed by adopting crack network volume fracturing, and on the basis of forming transverse cracks, secondary microcracks 4 can be induced to expand and extend by using a steering agent in the cracks, so that the swept volume of an artificial crack network is increased.
In the above embodiment, further, the injection fractures and the production fractures are arranged in a staggered manner in space, and the injection fractures are located between two adjacent sections of the production fractures, so as to communicate the secondary microcracks 4 in the production fractures by using the injection fractures. As shown in fig. 1, specifically, in the figure, the first injection fracture 31 is located between the first production fracture 21 and the second production fracture 22, and the second injection fracture 32 is located between the second production fracture 22 and the third production fracture 23, that is, the injection fracture is located between two adjacent production fractures, so that the injection fracture can be used to fully communicate with the secondary microcracks 4 in the production fractures, thereby establishing an effective communication seepage channel.
Meanwhile, the invention also provides a hot dry rock horizontal well exploitation tubular column structure, which comprises: the production horizontal well 1 comprises a production horizontal well 1, a completion pipe string 51 and a production pipe string, wherein the production horizontal well 1 is provided with a horizontal section, and at least the horizontal section is arranged in a hot dry rock reservoir; the completion string 51 is disposed in the production horizontal well 1 and arranged along the extension direction of the production horizontal well 1; the production string is arranged in the completion string 51 and arranged along the extension direction of the completion string 51, wherein a plurality of injection units and collection units are separated in the production horizontal well 1, liquid entering the production horizontal well 1 leaves the production horizontal well 1 from the plurality of injection units and generates a water-vapor mixture in the hot dry rock reservoir, and then enters the production string through the collection units and is carried away from the production string structure.
In this embodiment, the production horizontal well 1 is modified by differential hydraulic fracturing, that is, the injection fractures are formed by a fracture-control high-pressure fracturing process, and the production fractures are formed by a fracture-network volume fracturing process, so as to form an enhanced geothermal system. The completion string 51 may achieve effective isolation between the injection and production fractures of the production horizontal well 1, thereby forming separate injection and production units. Further, completion string 51 comprises a completion casing, which may be an existing production casing, that is required to meet engineering and safe production specifications and production string tripping operations. The production string may provide lift power and access for the produced fluids from the formation to flow back to the surface. Further, the production string includes a production tubing 61 and a lift pump 62, wherein the production tubing 61 may be an existing insulated tubing to facilitate reducing heat loss when high temperature fluids produced from the formation flow out. A lift pump 62 is provided at the tail end of the production tubing string and the lift pump 62 is used to pump the steam mixture from the well up to the formation. The lift pump 62 may be an existing high temperature resistant lift pump 62, so as to meet the lift requirement of the formation returning the water-vapor mixture.
As an alternative embodiment, in certain embodiments, the injection unit is at least partially in contact with the injection fracture and the collection unit is at least partially in contact with the production fracture. Further, the injection fractures and production fractures are staggered along the horizontal section of the producing horizontal well 1.
In the embodiment, the injection unit is communicated with the injection fracture, the acquisition unit is communicated with the production fracture, liquid in the production horizontal well 1 flows through the injection unit, enters the injection fracture of the hot dry rock reservoir, exchanges heat with heat carried by the hot dry rock reservoir to generate a high-temperature high-pressure water-vapor mixture, then enters the acquisition unit through the production fracture, finally enters the production pipe column and is taken away from the production pipe column structure. The injection cracks and the production cracks are arranged in a staggered mode in space, namely the injection cracks are located between two adjacent sections of production cracks, secondary microcracks 4 in the production cracks can be fully communicated by the injection cracks, and therefore effective communicated seepage channels are established.
In the above embodiment, further, the injection unit includes a two-pipe outer packer and an injection check valve disposed inside the two-pipe outer packer, and the injection unit with the injection check valve is in contact with the injection slit. Further, the collection unit comprises two outer-pipe packers and production one-way valves arranged in the two outer-pipe packers, and the collection unit with the production one-way valves is in contact with the production cracks.
Specifically, the external packer of the pipe adopts the existing high-pressure-resistant and high-temperature-resistant water-swelling packer which can be arranged on two sides of a production crack and an injection crack and used for separating the injection crack and the extraction crack, so that an injection unit and an acquisition unit which are mutually independent are established. The injection one-way valve is arranged in the two-pipe outer packer, and the injection one-way valve is a one-way flow valve which allows the water in the pipe to flow out of the pipe and limits the water outside the pipe to flow into the pipe so as to ensure that the ground low-temperature water is injected into the stratum. The production one-way valve is arranged in the two-pipe outer packer, and the production one-way valve is a one-way flow valve which allows the outside of the pipe to flow into the pipe and limits the flow in the pipe to flow out of the pipe so as to ensure that the stratum produced water vapor flows into the well.
As shown in fig. 1, fig. 1 shows a first external pipe packer 521, a second external pipe packer 522, a third external pipe packer 523, a fourth external pipe packer 524, a fifth external pipe packer 525, a first production check valve 531, a second production check valve 532, a third production check valve 533, a first injection check valve 541 and a second injection check valve 542, which form an interleaved injection unit and an acquisition unit, respectively. The first external packer 521 and the second external packer 522 are respectively sealed at two sides of the first production fracture 21, a first production one-way valve 531 is arranged in the middle of the well completion casing between the first external packer 521 and the second external packer 522, and a one-way production unit consisting of the first production fracture 21, the first external packer 521, the second external packer 522 and the first production one-way valve 531 can be formed, so that one-way production of the first production fracture 21 into the well completion casing is realized.
The second external packer 522 and the third external packer 523 are respectively set at two sides of the first injection crack 31, a first injection one-way valve 541 is arranged in the middle of the completion casing between the second external packer 522 and the third external packer 523, so that a one-way injection unit consisting of the first injection crack 31, the second external packer 522, the third external packer 523 and the first injection one-way valve 541 can be formed, and one-way injection of the interior of the completion casing to the first injection crack 31 is realized.
The third external packer 523 and the fourth external packer 524 are respectively set on two sides of the second production fracture 22, and a second production check valve 532 is arranged in the middle of the completion casing between the third external packer 523 and the fourth external packer 524, so that a one-way production unit consisting of the second production fracture 22, the third external packer 523, the fourth external packer 524 and the second production check valve 532 can be formed, and one-way production of the second production fracture 22 to the inside of the completion casing is realized.
The fourth external packer 524 and the fifth external packer 525 are respectively set at two sides of the second injection fracture 32, a second injection one-way valve 542 is arranged in the middle of the completion casing between the fourth external packer 524 and the fifth external packer 525, and a one-way injection unit consisting of the second injection fracture 32, the fourth external packer 524, the fifth external packer 525 and the second injection one-way valve 542 can be formed, so that one-way injection into the injection fracture inside the completion casing is realized.
The fifth external packer 525 is seated between the second injection fracture 32 and the third production fracture 23, and the bottom of the completion casing is provided with a third production check valve 533, so that a one-way production unit consisting of the third production fracture 23, the fifth external packer 525 and the third production check valve 533 can be formed, and therefore one-way production of the third production fracture 23 into the completion casing is realized.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. A hot dry rock alternate injection and production method is characterized by comprising the following steps:
injecting liquid with first temperature and pressure into the annular space of the well completion pipe column and the production pipe column according to set injection pressure, entering a production horizontal well along the annular space, and entering an injection crack of the hot dry rock reservoir through an injection check valve of an injection unit;
increasing the injection pressure until a set pressure threshold value stops continuously injecting liquid into the annulus between the completion string and the production string, and performing heat exchange between the liquid entering the injection fracture and heat carried by the hot dry rock reservoir so as to generate a water-vapor mixture with a second temperature and pressure, wherein the second temperature and pressure is higher than the first temperature and pressure;
the water-vapor mixture injected into the cracks of the dry hot rock reservoir enters the well completion pipe string from the production cracks and then is lifted to the stratum through the production pipe string for utilization.
2. The alternate injection and production method for hot dry rock according to claim 1, characterized in that the injection fractures adopt a high pressure fracturing process with controlled lower fractures, wherein the lower fractures of the artificial fractures are controlled by using a sinking agent and a diverting agent so as to form asymmetric vertical fractures, and the artificial fracture network of the adjacent production fractures is communicated by using the upper fractures.
3. The alternate injection and production method for hot dry rock according to claim 2, wherein the sinking agent and the diverting agent are micro powders with density higher than a set value, and can form a low-permeability artificial isolation layer at the bottom of the crack so as to control the downward extension of the artificial crack.
4. The alternate injection and production method for the hot dry rock as claimed in claim 1, wherein the production fractures adopt a fracture network volume fracturing process, wherein on the basis of horizontal well fracturing transverse fractures, a fracture internal diverting agent is adopted to induce secondary micro-fracture to expand and extend so as to improve the swept volume of an artificial fracture network and provide larger heat exchange volume and heat exchange area.
5. The alternate injection and production method for hot and dry rock according to claim 1, wherein the injection fractures and the production fractures are spatially staggered, wherein the injection fractures are located between two adjacent sections of the production fractures so as to communicate secondary microcracks in the production fractures with the injection fractures.
6. The utility model provides a hot dry rock horizontal well exploitation tubular column structure which characterized in that includes:
a production horizontal well having a horizontal section and at least the horizontal section disposed in the hot dry rock reservoir;
a completion string disposed within and arranged along the direction of extension of the production horizontal well; and the number of the first and second groups,
a production string disposed within and arranged along an extent of the completion string, wherein,
the production horizontal well is internally divided into a plurality of injection units and a plurality of acquisition units, liquid entering the production horizontal well leaves the production horizontal well from the plurality of injection units and generates a water-vapor mixture in the hot dry rock reservoir, and then enters the production string through the acquisition units and is taken away from the mining string structure.
7. The hot dry rock horizontal well production string configuration of claim 6, wherein the injection unit is at least partially in contact with an injection fracture and the collection unit is at least partially in contact with a production fracture.
8. The hot dry rock horizontal well production string structure of claim 7, wherein the injection fractures and the production fractures are staggered along a horizontal segment of the production horizontal well.
9. The hot dry rock horizontal well production string structure as claimed in claim 7, wherein the injection unit comprises two external packers and injection check valves disposed in the two external packers, the injection unit with the injection check valves being in contact with the injection fractures.
10. The hot dry rock horizontal well production string structure as claimed in claim 7, wherein the collection unit comprises two external packers and production check valves disposed in the two external packers, the collection unit with the production check valves being in contact with the production fractures.
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| RU2547892C1 (en) * | 2014-03-26 | 2015-04-10 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Multiple hydraulic fracturing of formation in well horizontal shaft |
| CN105840146A (en) * | 2016-04-14 | 2016-08-10 | 中国石油大学(华东) | Method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies |
| CN110295879A (en) * | 2018-03-23 | 2019-10-01 | 熊暮羽 | A kind of staged fracturing horizontal well in segments period note adopts dual string |
| CN113513298A (en) * | 2021-08-04 | 2021-10-19 | 广州海洋地质调查局 | Hot dry rock branch well same-well synchronous injection-production method and injection-production device |
| CN218862588U (en) * | 2022-07-25 | 2023-04-14 | 广州海洋地质调查局 | Hot dry rock horizontal well exploitation tubular column structure |
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| RU2547892C1 (en) * | 2014-03-26 | 2015-04-10 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Multiple hydraulic fracturing of formation in well horizontal shaft |
| CN105840146A (en) * | 2016-04-14 | 2016-08-10 | 中国石油大学(华东) | Method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies |
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