CN108954878A - A kind of mid-deep strata underground pipe horizontal well heat exchange structure and method - Google Patents
A kind of mid-deep strata underground pipe horizontal well heat exchange structure and method Download PDFInfo
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- CN108954878A CN108954878A CN201811033269.4A CN201811033269A CN108954878A CN 108954878 A CN108954878 A CN 108954878A CN 201811033269 A CN201811033269 A CN 201811033269A CN 108954878 A CN108954878 A CN 108954878A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a kind of mid-deep strata underground pipe horizontal well heat exchange structure and methods, one including being arranged on rock stratum or soil horizon opens Vertical Well, one bottom centre for opening Vertical Well offers two and drives a well, described two drive a well including sequentially connected straight well section, increasing hole angle section and horizontal segment, one open Vertical Well one drive a well surface pipe be set on the inside of wall, and one drives a well and opens cementing concrete filled with one between wall and surface pipe, surface pipe and two drive a well two drive a well and be provided with underground pipe outer tube on the inside of wall, and underground pipe outer tube and surface pipe and two drive a well two drive a well and open cementing concrete filled with two between on the inside of wall, underground pipe inner tube is provided in underground pipe outer tube, and underground pipe inner tube protrudes into one end of underground pipe outer tube and is connected to underground pipe outer tube, the underground pipe outer tube place of being in communication with the outside is heat-exchange working medium arrival end, underground pipe inner tube is in communication with the outside place For heat-exchange working medium outlet end.The present invention, which can be realized, takes heat not fetch water, and solves the problems, such as central tube heat preservation and service life.
Description
Technical field
The present invention relates to geothermal energy developments to utilize field, and in particular to a kind of mid-deep strata underground pipe horizontal well heat exchange structure and
Method.
Background technique
Mid-deep strata geothermal energy development utilizes there are two types of technologies at present, and mid-deep strata geothermal fluid utilizes technology and mid-deep strata underground heat
The energy buried tubular type extractive technique of straight well, specific as follows since both technologies all have certain disadvantage:
Mid-deep strata geothermal fluid utilization technology: the technology is utilized to be restricted by geothermal fluid occurrence condition, and difficulty of construction is big, adds
That there are geothermal fluids is serious to corrosive pipeline, the problems such as Tail water reuse environment easy to pollute, geothermal fluid resource is non-renewable.
The buried tubular type extractive technique of mid-deep strata geothermal energy straight well: the adaptability of technology is extensive, it is environmentally protective, energy-efficient,
Water conservation, but heat exchange amount is less high, economy is undesirable.
Summary of the invention
The purpose of the present invention is to provide a kind of mid-deep strata underground pipe horizontal well heat exchange structure and methods, to solve existing skill
The problem of art, the present invention, which can be realized, takes heat not fetch water, and solves the problems, such as central tube heat preservation and service life.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of mid-deep strata underground pipe horizontal well heat exchange structure, one including being arranged on rock stratum or soil horizon opens Vertical Well,
One bottom centre for opening Vertical Well offers two and drives a well, and described two drive a well including sequentially connected straight well section, increasing hole angle section and water
Flat section, one open Vertical Well one drive a well surface pipe be set on the inside of wall, and one drives a well and opens between wall and surface pipe filled with one
Cementing concrete, surface pipe and two drive a well two drive a well and be provided with underground pipe outer tube on the inside of wall, and underground pipe outer tube and surface layer cover
Pipe and two drive a well two drive a well and open cementing concrete filled with two between on the inside of wall, underground pipe inner tube is provided in underground pipe outer tube,
And underground pipe inner tube protrudes into one end of underground pipe outer tube and is connected to underground pipe outer tube, the underground pipe outer tube place of being in communication with the outside is heat exchange
Working medium entrances end, the underground pipe inner tube place of being in communication with the outside are heat-exchange working medium outlet end.
Further, the build angle rate of the increasing hole angle section is 5 °~10 °/30m.
Further, several centralizers that can be fixed in the outer tube hub of underground pipe are provided in underground pipe inner tube.
Further, the underground pipe inner tube is vacuum heat insulation tube.
Further, the heat-exchange working medium outlet end passes through piping connection to heat pump unit.
Further, the center line of the horizontal segment is 2000-3000m apart from the distance between earth's surface.
A kind of mid-deep strata underground pipe horizontal well heat-exchange method, comprising the following steps:
Step 1: progress one is opened Vertical Well and is drilled through on loose, loose or poor diagenetic grade stratum or soil horizon, until boring
It wears the stratum or soil horizon reaches stability, at the good layer position of lithology, then open tripping in size, intensity in Vertical Well one
The surface pipe matched, an annular gap to drive a well between wall and surface pipe open cementing concrete using one and are filled simultaneously sealing jail
It leans on；
Step 2: carrying out two in the bottom centre that one opens Vertical Well and open, and forms two and drives a well, entire two drive a well including opening from one
Straight well section, increasing hole angle section and the horizontal segment that vertical bottom successively drills through, in the underground pipe that two drive a well interior tripping in size, strength matching
Outer tube, two annular gaps to drive a well between wall and underground pipe outer tube and between surface pipe and underground pipe outer tube are opened solid using two
Well cement is filled and sealing is firm；
Step 3: underground pipe inner tube is set in underground pipe outer tube, and underground pipe inner tube protrudes into one end of underground pipe outer tube
It is communicated with underground pipe outer tube, the annular space between the underground pipe outer tube at well head and underground pipe inner tube is heat-exchange working medium entrance
It holds, the underground pipe inner tube place of being in communication with the outside is heat-exchange working medium outlet end at well head；
Step 4: annular heat-exchange working medium being pumped into from heat-exchange working medium arrival end between underground pipe outer tube and underground pipe inner tube
In space, heat-exchange working medium carries out heat exchange with stratum from during well head to shaft bottom downlink, so that heat is obtained, after extracting heat
Heat-exchange working medium arrive at behind shaft bottom to enter in underground pipe inner tube and return to heat-exchange working medium outlet end, complete heat transfer process.
Compared with prior art, the invention has the following beneficial technical effects:
Heat exchange structure of the invention opens Vertical Well by one, two opens straight well section, increasing hole angle section and horizontal segment head and the tail and be sequentially connected shape
At one opens Vertical Well, two centre bores for opening straight well section, increasing hole angle section and horizontal segment form heat exchanger channels, is configured in heat exchanger channels
Pipe laying outer tube, underground pipe inner tube is arranged in underground pipe outer tube, and heat-exchange working medium is flowed through vertical and level by underground pipe outer tube
In underground pipe heat exchange structure, heat exchange is carried out from the stratum outside horizontal well heat exchange structure and obtains heat, and then is not destroying geology
Structure does not extract GEOTHERMAL WATER and injures to underground environment zero, in the case where no pollution, realizes the purpose for taking heat not fetch water.Meanwhile
The present invention solves the problems, such as that the heat preservation of underground pipe inner tube and service life, underground pipe inner tube are placed in the reduction of underground pipe outer tube
Heat loss reduces the friction of underground pipe inner tube and ground mass flow and then can obtain more heats in the case where low energy consumption,
Increase underground pipe inner tube service life, in addition the present invention can carry out indefinite extension using net horizontal section as main heat exchanging segment,
The low problem of Vertical Well heat exchange efficiency is avoided, heat exchange efficiency is substantially increased.
Further, the build angle rate of increasing hole angle section is 5 °~10 °/30m, low before on the one hand horizontal well capable of being made to enter heat reservori
Hot-well section shortens, horizontal segment relative growth, improves heat exchange efficiency；On the other hand frictional resistance, the torque in drilling process are small, deflecting
Rate is stablized, and is conducive to safety drilling and is drilled to longer net horizontal section, and just achievable using conventional downhole tool, reduces and bores
Well cost improves drilling well economy.
Further, it can guarantee placed in the middle in underground pipe outer tube of underground pipe inner tube by the way that centralizer is arranged and can make
Annular space smooth outflow of the heat-exchange working medium between two pipes.
Further, using vacuum heat insulation tube, heat damage of the heat-exchange working medium after extracting heat during upper return is reduced
It loses, further, which is direct linkage type button, since the button-type is reduced under heat-exchange working medium without box cupling
Flow resistance during row reduces circulating pressure.
Further, the center line of horizontal well is 2000-3000m apart from the distance between earth's surface, here formation temperature
Higher, heat exchange efficiency is higher.
The method of the present invention heat-exchange working medium is injected from heat-exchange working medium arrival end, forms ring through underground pipe inner tube and underground pipe outer tube
Shape water flow structure flows into underground and enters heat exchange layer, and heat-exchange working medium mainly carries out heat exchange in straight well pars infrasegmentalis and horizontal segment stratum and obtains
Take heat, returned from underground pipe inner tube in shaft bottom, in uphill process reduce underground pipe inner tube high temperature heat-exchange working medium with
In annular space downlink low-temperature heat exchange working medium carry out heat exchange, thus reduce on return during thermal loss, heat-exchange working medium from
The open ports of underground pipe inner tube flow out, and complete heat exchange, and heat exchange efficiency is high.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Wherein: 1, rock stratum or soil horizon, 2, one drives a well wall, and 3, one opens cementing concrete, 4, surface pipe 5, two drive a well wall, 6,
Two open cementing concrete, 7, underground pipe outer tube, 8, underground pipe inner tube, 9, heat-exchange working medium arrival end, 10, heat-exchange working medium outlet end, 11,
Centralizer.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing:
Referring to Fig. 1, a kind of mid-deep strata underground pipe horizontal well heat exchange structure, including be arranged on rock stratum or soil horizon 1 one
Vertical Well is opened, a bottom centre for opening Vertical Well offers two and drives a well, and described two drive a well including sequentially connected straight well section, increasing hole angle
Section and horizontal segment, the build angle rate of the increasing hole angle section are 5 °~10 °/30m, one open Vertical Well one drive a well setting table on the inside of wall 2
Layer casing 4, and one drives a well and opens cementing concrete 3 filled with one between wall 2 and surface pipe 4, what surface pipe 4 and two drove a well two opens
Be provided with underground pipe outer tube 7 on the inside of the borehole wall 5, and underground pipe outer tube 7 and surface pipe 4 and two drive a well two drive a well 5 inside of wall
Between open cementing concrete 6 filled with two, underground pipe inner tube 8 is provided in underground pipe outer tube 7, underground pipe inner tube 8 is direct linkage type button-type
Vacuum heat insulation tube is provided with several centralizers 11 that can be fixed in 7 center of underground pipe outer tube in underground pipe inner tube 8, and
One end that underground pipe inner tube 8 protrudes into underground pipe outer tube 7 is connected to underground pipe outer tube 7, and 7 place of being in communication with the outside of underground pipe outer tube is to change
Hot working fluid arrival end 9,8 place of being in communication with the outside of underground pipe inner tube are heat-exchange working medium outlet end 10, the heat-exchange working medium outlet end 10
By piping connection to heat pump unit, the center line of the horizontal segment is 2000-3000m apart from the distance between earth's surface.
A kind of mid-deep strata underground pipe horizontal well heat-exchange method, comprising the following steps:
Step 1: progress one is opened Vertical Well and is drilled through on loose, loose or poor diagenetic grade stratum or soil horizon 1, until
It drills the stratum or soil horizon 1 and reaches stability, at the good layer position of lithology, then open tripping in size in Vertical Well, strong one
Matched surface pipe 4 is spent, an annular gap to drive a well between wall 2 and surface pipe 4 is opened cementing concrete 3 using one and is filled
And sealing is firm；
Step 2: carrying out two in the bottom centre that one opens Vertical Well and open, and forms two and drives a well, entire two drive a well including opening from one
Straight well section, increasing hole angle section and the horizontal segment that vertical bottom successively drills through, in the underground pipe that two drive a well interior tripping in size, strength matching
Outer tube 7, two annular gaps to drive a well between wall 5 and underground pipe outer tube 7 and between surface pipe 4 and underground pipe outer tube 7 use
Two open cementing concrete 6 be filled and sealing it is firm；
Step 3: underground pipe inner tube 8 is set in underground pipe outer tube 7, and underground pipe inner tube 8 protrudes into underground pipe outer tube 7
One end is communicated with underground pipe outer tube 7, and the annular space between the underground pipe outer tube 7 at well head and underground pipe inner tube 8 is heat exchange work
Matter arrival end 9,8 place of being in communication with the outside of underground pipe inner tube is heat-exchange working medium outlet end 10 at well head；
Step 4: heat-exchange working medium is pumped between underground pipe outer tube 7 and underground pipe inner tube 8 from heat-exchange working medium arrival end 9
In annular space, heat-exchange working medium carries out heat exchange with stratum from during well head to shaft bottom downlink, to obtain heat, extracts heat
Enter in underground pipe inner tube 8 behind heat-exchange working medium arrival shaft bottom after amount and return to heat-exchange working medium outlet end 10, completes heat transfer process.
Operating process of the embodiment of the present invention is described in detail below:
A kind of mid-deep strata underground pipe horizontal well heat exchange structure bores a bite horizontal well, Quan Jing using horizontal well annulus line structure
The lower petroleum casing pipe of section infuses the full well sections well cementation of double condensate mud systems, can be realized and heat is taken not fetch water, solve central tube heat preservation and
The problem of service life.
Concrete scheme is as follows: heat-exchange working medium enters in net horizontal section heat exchange structure from 7 straight well section of underground pipe outer tube, and with ground
Layer carries out heat exchange and obtains heat, and heat-exchange working medium is flowed out from horizontal segment underground pipe inner tube 8 through straight well section underground pipe inner tube 8, by buried
Pipe outer tube 7 and 8 straight well section of underground pipe inner tube and horizontal segment form mid-deep strata underground pipe horizontal well heat exchange structure, outside the underground pipe
Pipe 7 and underground pipe inner tube 8 are centered inside the straight well section and net horizontal section；Underground pipe is cased in the underground pipe outer tube 7
Inner tube 8；7 top of underground pipe outer tube has unlimited, and about the 8 underground pipe inner tube is respectively provided with open ports.
7 open upper end mouth of underground pipe outer tube is used as and changes as heat-exchange working medium arrival end 9,8 open upper end mouth of underground pipe inner tube
Hot working fluid outlet end 10,8 lower ending opening of underground pipe inner tube is as circulation water inlet.Upper end heat-exchange working medium arrival end 9 and heat exchange work
Matter outlet end 10 can be located at the installation site concordant with ground.
Heat-exchange working medium is injected from heat-exchange working medium arrival end 9, is flowed into underground through underground pipe outer tube 7 and is entered heat exchange layer, and exchange heat work
Matter mainly carries out heat exchange in straight well pars infrasegmentalis and horizontal segment stratum and obtains heat.Horizontal segment is located at 2500 meters or so, stratum temperature
Degree is higher, and underground pipe inner tube 8 and underground pipe outer tube 7 form annular water flow structure, and heat-exchange working medium is enabled preferably to exchange heat for
Amount, the low-temperature heat exchange working medium that downlink in the high temperature heat-exchange working medium and annular space of underground pipe inner tube is reduced in uphill process carry out
Heat exchange, thus reduce on return during thermal loss, heat-exchange working medium from the open ports of underground pipe inner tube flow out through pipeline into
Enter heat pump unit.
Underground pipe inner tube is no coupling pipe, the smooth reduction entrance resistance to water-flow of outer wall, and is vacuum heat insulation tube, heat-proof quality
By force, 350 degree of heatproof, it is easy for construction；Or underground pipe outer tube 7, underground pipe inner tube 8 are connected to and in communication with institute by more single tube head and the tail
It is formed, specifically, internal screw thread is arranged at the upper end opening of underground pipe outer tube 7, is provided with external screw thread at lower ending opening.One buried
It is threadedly coupled in another 7 upper end of underground pipe outer tube of the lower end precession of pipe outer tube 7 and with it, to be changed after two casing connections
Hot working fluid will not be leaked in junction, and then will not be polluted to underground environment.The upper and lower side of certain underground pipe outer tube 7 can also
To use other structures being mutually adapted known to a person skilled in the art, to make fluid working substance in multiple underground pipe outer tubes
Junction do not leak.
Claims (7)
1. a kind of mid-deep strata underground pipe horizontal well heat exchange structure, which is characterized in that including being arranged on rock stratum or soil horizon (1)
One opens Vertical Well, and a bottom centre for opening Vertical Well offers two and drives a well, and described two drive a well including sequentially connected straight well section, increase
Oblique section and horizontal segment, one open Vertical Well one drive a well surface pipe (4) be set on the inside of wall (2), and one drives a well wall (2) and surface layer
Open cementing concrete (3) between casing (4) filled with one, surface pipe (4) and two drive a well two drive a well and be provided with ground on the inside of wall (5)
Pipe laying outer tube (7), and underground pipe outer tube (7) and surface pipe (4) and two drive a well two drive a well between on the inside of wall (5) filled with two
It opens cementing concrete (6), is provided in underground pipe outer tube (7) underground pipe inner tube (8), and underground pipe inner tube (8) protrudes into outside underground pipe
One end of pipe (7) is connected to underground pipe outer tube (7), and underground pipe outer tube (7) place of being in communication with the outside is heat-exchange working medium arrival end (9),
Underground pipe inner tube (8) place of being in communication with the outside is heat-exchange working medium outlet end (10).
2. a kind of mid-deep strata underground pipe horizontal well heat exchange structure according to claim 1, which is characterized in that the increasing hole angle section
Build angle rate be 5 °~10 °/30m.
3. a kind of mid-deep strata underground pipe horizontal well heat exchange structure according to claim 1, which is characterized in that underground pipe inner tube
(8) several centralizers (11) that can be fixed in underground pipe outer tube (7) center are provided on.
4. a kind of mid-deep strata underground pipe horizontal well heat exchange structure according to claim 1, which is characterized in that the underground pipe
Inner tube (8) is vacuum heat insulation tube.
5. a kind of mid-deep strata underground pipe horizontal well heat exchange structure according to claim 1, which is characterized in that the heat exchange work
Matter outlet end (10) passes through piping connection to heat pump unit.
6. a kind of mid-deep strata underground pipe horizontal well heat exchange structure according to claim 1, which is characterized in that the horizontal segment
Center line apart from the distance between earth's surface be 2000-3000m.
7. a kind of mid-deep strata underground pipe horizontal well heat-exchange method, which comprises the following steps:
Step 1: progress one is opened Vertical Well and is drilled through on loose, loose or poor diagenetic grade stratum or soil horizon (1), until boring
It wears the stratum or soil horizon (1) and reaches stability, at the good layer position of lithology, then open tripping in size in Vertical Well, strong one
It spends matched surface pipe (4), cementing concrete (3) are opened using one in an annular gap to drive a well between wall (2) and surface pipe (4)
It is filled and sealing is firm；
Step 2: carrying out two in the bottom centre that one opens Vertical Well and open, and forms two and drives a well, and entire two drive a well including opening vertically from one
Straight well section, increasing hole angle section and the horizontal segment that bottom successively drills through, in the underground pipe outer tube that two drive a well interior tripping in size, strength matching
(7), between two annulars to drive a well between wall (5) and underground pipe outer tube (7) and between surface pipe (4) and underground pipe outer tube (7)
Gap using two open cementing concrete (6) be filled and sealing it is firm；
Step 3: underground pipe inner tube (8) are set in underground pipe outer tube (7), and underground pipe inner tube (8) protrudes into underground pipe outer tube
(7) one end is communicated with underground pipe outer tube (7), and the annular between the underground pipe outer tube (7) at well head and underground pipe inner tube (8) is empty
Between be heat-exchange working medium arrival end (9), underground pipe inner tube (8) place of being in communication with the outside is heat-exchange working medium outlet end (10) at well head；
Step 4: heat-exchange working medium is pumped between underground pipe outer tube (7) and underground pipe inner tube (8) from heat-exchange working medium arrival end (9)
Annular space in, heat-exchange working medium carries out heat exchange with stratum from during well head to shaft bottom downlink, to obtain heat, extracts
Enter on underground pipe inner tube (8) behind heat-exchange working medium arrival shaft bottom after heat and return to heat-exchange working medium outlet end (10), completes heat exchange
Process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811033269.4A CN108954878A (en) | 2018-09-05 | 2018-09-05 | A kind of mid-deep strata underground pipe horizontal well heat exchange structure and method |
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| CN201811033269.4A CN108954878A (en) | 2018-09-05 | 2018-09-05 | A kind of mid-deep strata underground pipe horizontal well heat exchange structure and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111664602A (en) * | 2020-05-14 | 2020-09-15 | 广东中科光年数智科技有限公司 | Bending geothermal well |
| CN111894547A (en) * | 2020-07-30 | 2020-11-06 | 陕西煤业化工技术研究院有限责任公司 | Heat exchange type horizontal well, heat exchange type cross orthogonal horizontal well factory and construction method |
| CN112576199A (en) * | 2020-12-21 | 2021-03-30 | 太原理工大学 | Production casing for geothermal well bore and construction method thereof |
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