CN112502687A - Artificial heat storage construction system and method for group-hole dry hot rock - Google Patents
Artificial heat storage construction system and method for group-hole dry hot rock Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
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- 239000007924 injection Substances 0.000 claims abstract description 55
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- 239000000126 substance Substances 0.000 claims abstract description 28
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- 239000004568 cement Substances 0.000 claims description 4
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- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/003—Insulating arrangements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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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
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a group-hole hot dry rock artificial heat storage construction system and a construction method, which aim at a new idea of hot dry rock artificial heat storage construction, take a group-hole construction method as a core, integrate means such as hydraulic fracturing and chemical stimulation and the like, carry out hot dry rock artificial heat storage construction, effectively improve the communication efficiency and the spread range of an injection well and a production well in hot dry rock development, increase the density and the number of cracks of a rock body, prolong a water flow exchange channel, obviously improve the effective volume and the heat exchange area of the artificial heat storage in the hot dry rock development, excite a hot dry rock reservoir by circulating water pressure, realize progressive damage of the rock body, improve the development width and the quality of the cracks, on one hand, relieve the defect of poor communication of the crack channels to a certain extent, on the other hand, avoid the instant shear damage of the rock body caused by continuous high water pressure, and reduce the possibility of inducing earthquake disasters, the hot dry rock artificial heat storage has enough mining efficiency and service life.
Description
Technical Field
The invention relates to the technical field of high-temperature geothermal resource exploitation, in particular to a group-hole dry hot rock artificial heat storage building system and a building method.
Background
Nowadays, the world energy crisis and environmental problems are becoming more severe, and development of new alternative energy sources with large reserves and environmental friendliness is gradually receiving attention from scientists of various countries. Among them, geothermal resources have become a new clean energy source for intensive research and development in various countries in the world due to their extremely high cleanliness, operational stability and wide spatial distribution.
According to the production mode, the method is mainly divided into a hydrothermal type and a dry-hot rock type. The dry hot rock is a high-temperature rock mass which is buried underground for thousands of meters and does not contain water or steam, mainly comprises igneous rock, has the temperature higher than 180 ℃, and has the characteristics of high temperature, hardness and compactness. The development potential of the hot dry rock resources is huge, and the energy contained in the hot dry rock within the depth range of 3-10 kilometers of the deep part of the earth crust is estimated to be 30 times of the total energy of the global stone energy source.
The application process of the dry hot rock comprises the steps of establishing an injection well and a production well by using a drilling device, constructing an artificial heat exchange reservoir (artificial heat storage) with a large enough range to finally form an artificial geothermal field, pumping high-pressure water into the ground from the injection well, heating cold water flow to form high-temperature water or water vapor (the temperature can reach 150-200 ℃) through artificial cracks in the dry hot rock, pumping the high-temperature water or the water vapor out of the production well, and extracting geothermal energy in the cracks through heat exchange, so that the purposes of geothermal power generation and comprehensive heating utilization are achieved. However, due to the characteristics of low permeability and high compactness of the hot dry rock, how to build the efficient artificial heat storage becomes a difficult problem for development and utilization of the hot dry rock.
At present, the hot dry rock projects at home and abroad generally adopt single-well hydraulic fracturing and double-well water injection circulation to build artificial thermal reservoirs. The dry hot rock is hard compact rock, the fracture pressure is extremely high (60-90MPa), the expansion and extension of the crack in the single-well hydraulic fracturing process are limited, a single crack is easy to form, and the swept range is small; the double-well water injection circulation operation is limited by the length and the swept range of the fractured crack of the single well, the exploitation wells of the injection well are positioned on the same plane, the area of the exploitation wells contacting with the hot dry rock is small, the heat absorption range is small, the heat transfer is limited, and the artificial heat storage volume and the heat exchange area which are finally formed are hardly remarkably improved.
The invention relates to a similar reservoir reconstruction field, which is named as: a method for building artificial hot and dry rock heat storage by the cooperation of hydraulic fracturing and millisecond differential blasting; chinese patent application No.: 201911407535. X. However, the patent does not take into account the production well bore insulation and the blasting method is likely to induce seismic hazard problems. The invention adopts the heat preservation technology of the shaft of the production well, greatly improves the heat preservation effect, and the long and short horizontal well groups prolong the heat exchange channel of water flow, thereby greatly improving the heat exchange efficiency.
Disclosure of Invention
The technical scheme adopted by the invention for solving the technical problem is as follows:
the invention firstly provides an artificial heat storage construction system for hot dry rock in a group of holes, which comprises an injection well, a production well and a horizontal well which are positioned underground, and a liquid mixing vehicle, a chemical stimulation liquid tank, a clean water tank, an additive tank and a sand mixing vehicle which are positioned on the ground;
the injection well and the exploitation well are communicated with the horizontal well positioned at the lowest layer through the underground dry hot rock artificial heat storage, one end of each of the other horizontal wells is connected with the injection well, and the other end of each of the other horizontal wells is 100-200cm away from the exploitation well and is not communicated with the exploitation well;
the clean water tank and the additive tank are connected with the liquid mixing truck through a ground high-pressure pipeline, and additives and clean water required for preparing the fracturing fluid are supplied to the liquid mixing truck through opening a valve I in front of the additive tank and a valve in front of the clean water tank;
the liquid mixing vehicle is connected with a main pump through a ground high-pressure pipeline and supplies fracturing liquid to the main pump;
the chemical stimulation liquid tank is connected with the main pump through a ground high-pressure pipeline, and the chemical stimulation liquid is supplied to the main pump in a three-way mode by opening a valve in front of the chemical stimulation liquid tank;
the sand mixing vehicle is connected with the main pump through a ground high-pressure pipeline and supplies quartz sand proppant to the pump;
the other end of the main pump is connected with an injection pipe column in the well;
the in-well injection string extends into the injection well and seals the upper and lower strata through a packer arranged in the injection well;
the mining well is characterized in that a heat-insulating pipe column is installed on a shaft at the upper end of the mining well, a high-temperature well mouth is arranged on the ground of the heat-insulating pipe column, and a submersible pump is arranged in the mining well.
Wherein the number of the injection wells is 1 eye.
The number of the horizontal wells is 3-5.
The number of the production wells is 1.
The heat-insulating pipe column is a silicate pipe column capable of resisting 300-500 ℃ or a shaft heat-insulating layer filled with concrete, asbestos or clay.
The length of the horizontal well is 300-1000 m.
The submersible pump adopts an electric submersible pump or a sucker-rod pump.
The invention also provides a construction method of the group-hole hot dry rock artificial heat storage construction system, which comprises the following steps:
determining the depth and range of a target layer of the hot dry rock according to geological exploration data, determining a well group arrangement scheme of a development field, and determining the positions and depths of an injection well and a production well;
secondly, performing high-temperature drilling construction on the injection well and the exploitation well, and stopping drilling when the injection well and the exploitation well reach a target layer; preparing a heat-insulating pipe column at the upper well section of a dry hot rock reservoir of the exploitation well, selecting high-temperature cement slurry for high-temperature well cementation, and installing the prepared pipe column to complete well completion operation;
drilling a plurality of vertical parallel horizontal drilled holes in the target layer to form a plurality of horizontal wells, wherein the distance between every two adjacent horizontal wells is less than or equal to the sum of the lengths of cracks formed by the two horizontal wells due to hydraulic fracturing;
performing segmented hydraulic fracturing and chemical stimulation operation in a plurality of horizontal wells simultaneously, mixing liquid from a clean water tank and an additive tank by using a liquid mixing vehicle to form fracturing liquid and supply the fracturing liquid to a main pump, supplying the chemical stimulation liquid to the main pump by using a chemical stimulation liquid tank, switching injection of the fracturing liquid and the chemical stimulation liquid, injecting the main pump into an injection well through an in-well injection pipe column to perform heat storage construction, and continuously pumping quartz sand proppant into a fracture channel by using a sand mixing vehicle during the process so as to ensure that the fracture channel is in an open state and obtain vertical communication of stratums between an upper horizontal well and a lower horizontal well;
and fifthly, continuously injecting high-pressure normal-temperature water into the injection well, enabling the injected water to flow to a lower horizontal well and nearby cracks along the cracks under the action of pressure and gravity along the shaft, performing sufficient heat exchange with the fractured high-temperature dry hot rock stratum and then enabling the water to reach the exploitation well, enabling the exploitation well to suck high-temperature fluid by using a submersible pump to maintain the pressure of a wellhead of the exploitation well above the saturated steam pressure, sucking the high-temperature water in the exploitation well to the ground by using the submersible pump, and injecting the high-temperature water into the injection well again after heat exchange with a heat exchanger is completed, so that a continuous production.
And C, preparing the fracturing fluid of the fourth step, wherein the fracturing fluid of the fourth step is normal-temperature clear water or low-viscosity fracturing fluid, and the temperature of the normal temperature is less than 25 ℃.
And fifthly, the high-pressure normal-temperature water is water with the pressure of 2-10MPa and the temperature of less than 25 ℃.
The invention has the beneficial effects that:
the group-hole hot dry rock artificial heat storage construction system and the construction method provided by the invention are a new idea for hot dry rock artificial heat storage construction, the group-hole hot dry rock artificial heat storage construction system and the construction method are taken as cores, and the hot dry rock artificial heat storage construction is carried out by integrating means such as hydraulic fracturing and chemical stimulation, so that the density and the number of rock body cracks can be effectively increased, a plurality of horizontal wells are adopted, the communication efficiency and the sweep range of an injection well and a production well in hot dry rock development can be effectively improved, a water flow exchange channel is prolonged, the effective volume and the heat exchange area of artificial heat storage are increased, and the hot dry rock artificial heat storage is ensured to have sufficient production efficiency and service life; meanwhile, the circulating water pressure is adopted to excite the hot dry rock reservoir, so that the progressive damage of the rock mass is realized, the development width and the quality of the fracture are improved, on one hand, the defect of poor communication of fracture channels is relieved to a certain extent, on the other hand, the phenomenon that the rock mass is instantaneously sheared and damaged due to continuous high water pressure is avoided, and the possibility of inducing earthquake disasters is reduced. The system and the method of the invention realize the effective large-scale artificial heat storage construction of the hot dry rock, improve the economic benefit of hot dry rock development and meet the requirement of commercial development.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, 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 described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic structural diagram of a group-hole hot dry rock artificial heat storage construction system according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of a thermal insulation string and a high temperature wellhead provided by an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As shown in fig. 1-2, the artificial heat storage construction system for the hot dry rock with the group of holes provided by the invention comprises an injection well 1, a production well 2 and a horizontal well 4 which are positioned underground, and a liquid mixing truck 8, a chemical stimulation liquid tank 9, a clean water tank 10, an additive tank 11 and a sand mixing truck 12 which are positioned on the ground; wherein the number of the injection wells 1 is 1. The number of the horizontal wells 4 is 3-5. The number of the production wells 5 is 1.
The injection well 1 and the exploitation well 2 are communicated with a horizontal well positioned at the lowest layer through an underground dry hot rock artificial heat storage 3, one end of each of other horizontal wells 4 is connected with the injection well 1, and the other end of each of the other horizontal wells is 100-200cm away from the exploitation well and is not communicated with the exploitation well 2; the length of the horizontal well 4 is 500-1000 m.
The clean water tank 10 and the additive tank 11 are connected with the liquid mixing truck 8 through a ground high-pressure pipeline 19, and additives and clean water required for preparing the fracturing fluid are supplied to the liquid mixing truck 8 by opening a first valve 16 in front of the additive tank 11 and a second valve 17 in front of the clean water tank 10;
the liquid mixing vehicle 8 is connected with a main pump 7 through a ground high-pressure pipeline 19 and supplies fracturing liquid to the main pump;
the chemical stimulation liquid tank 9 is connected with the main pump 7 through a ground high-pressure pipeline 19, and chemical stimulation liquid is supplied to the main pump by opening a valve III 18 in front of the chemical stimulation liquid tank 9;
the sand mixing vehicle 12 is connected with the main pump 7 through a ground high-pressure pipeline 19 and supplies quartz sand proppant to the pump;
the other end of the main pump 7 is connected with an in-well injection pipe column 6;
the well injection string 6 extends into the injection well 1 and seals off the upper and lower strata by a packer 21 installed in the injection well;
the upper end of the shaft of the exploitation well 2 is provided with a heat preservation pipe column 14, and specifically, the heat preservation pipe column 14 is a silicate pipe column resistant to 300-500 ℃ or a shaft heat preservation layer filled with concrete, asbestos or clay.
The heat-insulating pipe column 14 is provided with a high-temperature wellhead 13 at the ground, and a submersible pump 15 is arranged in the production well 2. In particular, the submersible pump 15 is an electric submersible pump or a sucker-rod pump.
The invention also provides a construction method of the group-hole hot dry rock artificial heat storage construction system, which comprises the following steps:
firstly, determining the depth and range of a target layer of the hot dry rock according to geological exploration data, determining a well group arrangement scheme of a development field, and determining the positions and depths of an injection well 1 and a production well 2;
secondly, performing high-temperature drilling construction on the injection well 1 and the production well 2, and stopping drilling when the injection well 1 and the production well 2 are constructed to a target layer; the upper well section of the dry hot rock reservoir of the exploitation well 2 is provided with a heat preservation pipe column 14, so that the heat loss of the liquid which is exploited is reduced in the straight well section, high-temperature cement slurry is selected for high-temperature well cementation, and the well completion operation is completed by installing the prepared pipe column;
drilling a plurality of vertical parallel horizontal drilled holes in a target layer to form a plurality of horizontal wells 4, namely group holes, wherein the distance between every two adjacent horizontal wells 4 is less than or equal to the sum of the lengths of cracks formed by the two horizontal wells 4 due to hydraulic fracturing; wherein, one horizontal well positioned at the lowest part is used for communicating the injection well with the production well, and other horizontal wells are connected with the injection well, are 100-200cm away from the production well and are not communicated with the production well; selecting high-temperature cement slurry to perform high-temperature well cementation, and installing a prepared pipe column to complete well completion operation;
fourthly, simultaneously implementing sectional type hydraulic fracturing and chemical stimulation operation in the plurality of horizontal wells 4, adopting a liquid mixing vehicle 8 to mix liquid from a clear water tank 10 and an additive tank 11 to form fracturing liquid and supply the fracturing liquid to a main pump 7, supplying the chemical stimulation liquid to the main pump by a chemical stimulation liquid tank 9, and switching and injecting the fracturing liquid and the chemical stimulation liquid, wherein the fracturing liquid is clear water or low-viscosity fracturing liquid at normal temperature, and the temperature at the normal temperature is less than 25 ℃.
The main pump 7 injects the hot-stored building into an injection well through an injection pipe column 6 in the well, the positive semi-chordal circulating water pressure controlled by a water pressure controller 20 is adopted, the hydraulic fracturing is stopped after a fracture channel is opened through multiple cycles, and during the process, the sand mixing truck 12 is used for continuously pumping the quartz sand proppant into the fracture channel to ensure that the fracture channel is in an open state; by implementing sectional hydraulic fracturing and chemical stimulation operation, a series of vertical cracks extending in the direction of the maximum principal stress are generated between horizontal wells 4 of a dry hot rock target layer and a near well zone, and the vertical communication of the stratum between an upper horizontal well and a lower horizontal well is obtained;
and fifthly, continuously injecting high-pressure normal-temperature water into the injection well 1, wherein the high-pressure normal-temperature water is water with the pressure of 2-10MPa and the temperature of less than 25 ℃. The injected water flows to the lower horizontal well 4 and the nearby cracks along the cracks under the action of pressure and gravity along the shaft, and is subjected to sufficient heat exchange with the fractured high-temperature dry hot rock stratum and then enters the exploitation well, the exploitation well 2 utilizes the submersible pump 15 to pump high-temperature fluid so as to maintain the wellhead pressure of the exploitation well 2 above the saturated steam pressure, the high-temperature water in the exploitation well 2 is pumped to the ground through the submersible pump 15, and after the heat exchange with the heat exchanger is completed, the high-temperature water is injected into the injection well 1 again, so that a continuous production process is formed. The crack between the horizontal wells greatly increases the heat exchange area between the injected water and the stratum, thereby being beneficial to improving the speed of the injected water and the heat exchange quantity with the stratum and improving the geothermal exploitation efficiency of the hot dry rock.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The artificial heat storage construction system for the hot dry rock with the group of holes is characterized by comprising an injection well (1), a production well (2) and a horizontal well (4) which are positioned underground, and a liquid mixing vehicle (8), a chemical stimulation liquid tank (9), a clean water tank (10), an additive tank (11) and a sand mixing vehicle (12) which are positioned on the ground;
the injection well (1) and the exploitation well (2) are communicated with the horizontal well positioned at the lowest layer through the underground dry hot rock artificial heat storage (3), one end of each of the other horizontal wells (4) is connected with the injection well (1), and the other end of each of the other horizontal wells is 100-200cm away from the exploitation well (2) and is not communicated with the exploitation well (2);
the clean water tank (10) and the additive tank (11) are connected with the liquid mixing truck (8) through a ground high-pressure pipeline (19), and additives and clean water required for preparing fracturing fluid are supplied to the liquid mixing truck (8) by opening a first valve (16) in front of the additive tank (11) and a second valve (17) in front of the clean water tank (10);
the liquid mixing vehicle (8) is connected with a main pump (7) through a ground high-pressure pipeline (19) and supplies fracturing liquid to the main pump;
the chemical stimulation liquid tank (9) is connected with the main pump (7) through a ground high-pressure pipeline (19), and the chemical stimulation liquid is supplied to the main pump by opening a valve III (18) in front of the chemical stimulation liquid tank (9);
the sand mixing vehicle (12) is connected with a main pump (7) through a ground high-pressure pipeline (19) and supplies quartz sand proppant to the pump;
the other end of the main pump (7) is connected with an injection pipe column (6) in the well;
the injection pipe column (6) in the well extends into the injection well (1) and seals the upper stratum and the lower stratum by a packer (21) arranged in the injection well;
the heat-insulation pipe column (14) is installed on a shaft at the upper end of the production well (2), the heat-insulation pipe column (14) is provided with a high-temperature well mouth (13) at the ground, and the submersible pump (15) is arranged in the production well (2).
2. A group-hole hot dry rock artificial heat storage construction system according to claim 1, characterized in that the number of injection wells (1) is 1.
3. A group-hole hot dry rock artificial heat storage construction system according to claim 1, characterized in that the number of horizontal wells (4) is 3-5.
4. A group-hole hot dry rock artificial heat storage construction system according to claim 1, characterized in that the number of production wells (5) is 1 hole.
5. A group-hole hot dry rock artificial heat storage construction system according to claim 1, characterized in that the insulation pipe string (14) is a 300-500 ℃ resistant silicate pipe string or a shaft insulation layer filled with concrete, asbestos or clay.
6. A group-hole hot dry rock artificial heat storage construction system according to claim 1, characterized in that the horizontal well (4) is 300-1000m long.
7. A group-hole hot dry rock artificial heat storage construction system according to claim 1, characterized in that the submersible pump (15) is an electric submersible pump or a sucker rod pump.
8. A method of constructing a group-hole hot dry rock artificial heat storage construction system as claimed in any one of claims 1 to 8, comprising the steps of:
firstly, determining the depth and range of a target layer of the hot dry rock according to geological exploration data, determining a well group arrangement scheme of a development field, and determining the positions and depths of an injection well (1) and a production well (2);
secondly, performing high-temperature drilling construction on the injection well (1) and the production well (2), and stopping drilling when the injection well (1) and the production well (2) are constructed to a target layer; a heat-insulating pipe column (14) is arranged at the upper well section of a dry hot rock reservoir of the exploitation well (2), high-temperature cement slurry is selected for high-temperature well cementation, and the well completion operation is completed by installing the prepared pipe column;
drilling a plurality of vertical parallel horizontal drilled holes in the target layer to form a plurality of horizontal wells (4), wherein the distance between every two adjacent horizontal wells (4) is less than or equal to the sum of the lengths of cracks formed by the two horizontal wells (4) due to hydraulic fracturing;
fourthly, segmented hydraulic fracturing and chemical stimulation operation are simultaneously carried out in a plurality of horizontal wells (4), a liquid mixing vehicle (8) is adopted to mix liquid from a clear water tank (10) and an additive tank (11) to form fracturing liquid and supply the fracturing liquid to a main pump (7), a chemical stimulation liquid tank (9) supplies chemical stimulation liquid to the main pump, the fracturing liquid and the chemical stimulation liquid are switched to be injected, the main pump (7) injects the fracturing liquid and the chemical stimulation liquid into an injection well through an in-well injection pipe column (6) to implement heat storage construction, positive half-chord type circulating water pressure controlled by a water pressure controller (20) is adopted, water pressure fracturing is stopped after a fracture channel is opened through multiple cycles, and during the process, quartz sand propping agent is continuously pumped into the fracture channel through a sand mixing vehicle (12), so that the fracture channel is ensured to be in an open state, and vertical communication of the horizontal wells between the upper stratum and the lower;
and fifthly, continuously injecting high-pressure normal-temperature water into the injection well (1), enabling the injected water to flow to a lower horizontal well (4) and a nearby crack along the crack under the action of pressure and gravity along a shaft, enabling the injected water to fully exchange heat with the fractured high-temperature dry hot rock stratum and then reach a production well, enabling the production well (2) to suck high-temperature fluid by using a submersible pump (15) to maintain the wellhead pressure of the production well (2) above the saturated steam pressure, pumping the high-temperature water in the production well (2) to the ground by using the submersible pump (15), and injecting the high-temperature water into the injection well (1) again after heat exchange with a heat exchanger is completed, so that a continuous production process is formed.
9. The method for constructing a group-hole hot dry rock artificial heat storage construction system as claimed in claim 8, wherein the fracturing fluid of the fourth step is normal temperature clear water or low viscosity fracturing fluid, and the normal temperature is less than 25 ℃.
10. The method for constructing a group-hole hot dry rock artificial heat storage construction system as claimed in claim 8, wherein the high-pressure normal-temperature water in the fifth step is water with a pressure of 2-10MPa and a temperature of < 25 ℃.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659284A (en) * | 2022-03-31 | 2022-06-24 | 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） | Multistage circulating heat-taking device and method for high-temperature rock mass |
| CN114673479A (en) * | 2022-05-07 | 2022-06-28 | 中国矿业大学 | Based on heterogeneous state CO2Horizon type geothermal strengthening mining method |
| CN116164426A (en) * | 2022-04-14 | 2023-05-26 | 四川大学 | Method for building dry thermal rock artificial heat storage by deep folds |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659284A (en) * | 2022-03-31 | 2022-06-24 | 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） | Multistage circulating heat-taking device and method for high-temperature rock mass |
| CN116164426A (en) * | 2022-04-14 | 2023-05-26 | 四川大学 | Method for building dry thermal rock artificial heat storage by deep folds |
| CN114673479A (en) * | 2022-05-07 | 2022-06-28 | 中国矿业大学 | Based on heterogeneous state CO2Horizon type geothermal strengthening mining method |
| CN114673479B (en) * | 2022-05-07 | 2022-11-08 | 中国矿业大学 | Based on heterogeneous state CO 2 Horizon type geothermal strengthening mining method |
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