CN117267965B - Method for mining dry and hot rock by closed circulation of multilayer multi-branch horizontal well - Google Patents
Method for mining dry and hot rock by closed circulation of multilayer multi-branch horizontal well Download PDFInfo
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- CN117267965B CN117267965B CN202311549682.7A CN202311549682A CN117267965B CN 117267965 B CN117267965 B CN 117267965B CN 202311549682 A CN202311549682 A CN 202311549682A CN 117267965 B CN117267965 B CN 117267965B
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- 239000011435 rock Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005065 mining Methods 0.000 title claims description 5
- 239000012530 fluid Substances 0.000 claims abstract description 34
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 19
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- 230000002457 bidirectional effect Effects 0.000 claims description 3
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T2010/50—Component parts, details or accessories
- F24T2010/53—Methods for installation
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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
Abstract
The invention discloses a closed circulation dry-hot rock exploitation method for a multilayer multi-branch horizontal well, which relates to the technical field of energy exploitation and comprises the following steps: step one: early preparation: firstly, excavating a directional well to a geothermal reservoir of the dry hot rock, and then tunneling tunnels along different directions of the geothermal reservoir of the dry hot rock so as to prepare for subsequent fracturing heat exchange; step two: primary fracturing and secondary supplementary fracturing are carried out: this secondary supplementary fracturing is accomplished by the fracturing auxiliary device, and the fracturing auxiliary device includes stable supporting component and sets up the supplementary fracturing subassembly in stable supporting component bottom, through the setting of fracturing auxiliary device, has compensatied among the prior art to the incomplete place of fracturing and has carried out the defect of secondary fracturing, need not to repeat in filling the whole exploitation passageway with the fracturing fluid to avoid the extravagant condition of a large amount of fracturing fluids to take place, reduced the staff quantity that this pouring work time used simultaneously, reduced relevant personnel's intensity of labour.
Description
Technical Field
The invention relates to the technical field of energy exploitation, in particular to a closed circulation method for exploiting dry hot rock in a multilayer multi-branch horizontal well.
Background
The exploitation of dry thermal rock energy is a leading-edge scientific technology, and relates to multiple industries and multiple disciplines, the dry thermal rock generally refers to high Wen Yanti with the temperature of more than 180 ℃ and the burial depth of thousands of meters, no fluid or only a small amount of underground fluid exists in the dry thermal rock, the rock is not a common stone, water does not exist in the rock, how to extract heat in the stone is a troublesome problem under the condition that water does not exist, in the prior art, a well is firstly drilled, after the well hole is closed, high-pressure water with lower temperature is injected into the well, so that the whole rock is fractured, cracks are generated, then the generated cracks are further transformed and enlarged through chemical reagents, the contact area is formed, good connectivity is formed, then the injected water and the surrounding rock generate heat exchange, high-temperature high-pressure water or water vapor mixture is generated, and the special deep well is extracted to the ground, and the special deep well can be used for power generation, heating and the like.
In the prior art, if the fracture fracturing of the rock is not ideal, the re-fracturing work needs to be carried out, and when the secondary supplementary fracturing is carried out, the operation of filling the chemical reagent (fracturing fluid) into the whole production well can lead to a great deal of fracturing fluid waste, and meanwhile, a great deal of staff can be used for the operation, so that the time and the labor are wasted.
Therefore, a closed circulation dry-hot rock exploitation method for the multilayer multi-branch horizontal well is provided, and the problems of time and labor waste and resource waste are solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a closed circulation dry-hot rock exploitation method for a multilayer multi-branch horizontal well, which has smaller volume and can carry out secondary supplementary fracturing on unqualified cracks at any position and avoid waste of fracturing fluid during use, so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for mining dry and hot rock by closed circulation of a multilayer multi-branch horizontal well comprises the following steps:
step one: early preparation:
firstly, two directional wells are excavated to a geothermal reservoir of the dry hot rock, one directional well is used as an injection well, the other directional well is used as a exploitation well, and then a roadway is tunneled in different directions of the geothermal reservoir of the dry hot rock under the directional well so as to prepare for subsequent fracturing heat exchange;
step two: primary fracturing and secondary supplementary fracturing are carried out:
firstly, injecting fracturing medium into an injection well, carrying out primary fracturing on a whole rock to generate cracks, then carrying out secondary supplementary fracturing on the cracks which are not ideal after the primary fracturing, wherein the secondary supplementary fracturing is completed by a fracturing auxiliary device, the fracturing auxiliary device comprises a stable supporting component and an auxiliary fracturing component arranged at the bottom end of the stable supporting component, the stable supporting component comprises a traction rope, the bottom end of the traction rope is fixedly connected with a connecting block, the bottom end of the connecting block is fixedly connected with an elliptic shaft disc, a telescopic rod a is arranged on the elliptic shaft disc, the auxiliary fracturing component comprises a main body block, the main body block is rotationally connected to the bottom end of the elliptic shaft disc through a rotating shaft, a telescopic rod b is fixedly connected to the left end face of the main body block, and one end, far away from the main body block, of the telescopic rod b is fixedly connected with a butt block;
step three: and (3) laying corresponding pipelines:
an injection pipeline is paved in the injection well and used for injecting a heat transfer medium, an output pipeline is paved in the exploitation well and used for outputting the heat transfer medium, a heat exchange pipeline is paved in the roadway, the injection pipeline, the heat exchange pipeline and the output pipeline are sequentially communicated to form a circulating pipeline, and the output pipeline is connected with a heat exploitation terminal;
step four: injecting a heat transfer medium and circularly completing geothermal exploitation:
and injecting a heat transfer medium into the injection pipeline, taking out the heat in the dry hot rock by the heat transfer medium, outputting the heat from the output pipeline, and finally collecting the heat taken out by the heat transfer medium in the output pipeline by the heat collecting terminal.
Preferably, the elliptical axis disc is symmetrically and fixedly connected with an auxiliary bar block by taking the elliptical axis disc as a center, both ends of the auxiliary bar block are fixedly connected with guide rods, swing bars are arranged above the auxiliary bar block, guide grooves are formed in the swing bars, and the guide rods are slidably connected in the guide grooves.
Preferably, the outer end of the swinging strip is hinged with a semicircular abutting block, the inner end of the swinging strip is rotatably connected with an extension rod, and the extension rod is fixed on the telescopic rod a.
Preferably, the right side of the main body block is provided with an auxiliary groove, telescopic rods c are fixedly connected in the auxiliary groove at equal intervals, and the outer ends of the telescopic rods c are provided with inflation bag chambers.
Preferably, a solution cavity is formed in the main body block and positioned in the ring of the auxiliary groove, and the bottom end of the solution cavity is fixedly connected with a two-way pump.
Preferably, the solution cavity inner wall equidistance fixedly connected with spring, spring outer end fixedly connected with is pushed the board, fixedly connected with coating film on the telescopic link c.
Compared with the prior art, the invention provides a closed circulation dry and hot rock exploitation method for a multilayer multi-branch horizontal well, which has the following beneficial effects:
by arranging the fracturing auxiliary device, the defect of secondary fracturing on the place where fracturing is incomplete in the prior art is overcome, and the fracturing fluid is not required to be repeatedly filled into the whole exploitation channel, so that the situation of waste of a large amount of fracturing fluid is avoided, the number of workers used in the filling working process is reduced, and the labor intensity of related workers is reduced;
after the fracturing operation is finished, the fracturing fluid remaining in the closed cavity is pumped into the auxiliary groove by the bidirectional pump again, so that the fracturing fluid can be reused, the waste of the fracturing fluid is avoided, the frequency of lifting the device by a conveying machine to supplement the fracturing fluid is reduced, and the multi-position supplementing fracturing operation can be completed by one-time lowering;
the auxiliary fracturing assembly can be quickly and accurately sent to an ideal position for estimating secondary supplementary fracturing according to set working requirements by using a high-strength traction rope and a main body block with exquisite design for effective configuration, the flexibility of the operation mode is quite strong, the limitation is quite small, the error which possibly occurs is greatly reduced, and the working accuracy is improved;
through the setting in inflation bag storehouse, when the gasbag that sets up takes place to bulge, the gasbag can self-adaptation directional well inner wall or tunnel inner wall, this is to forming the enclosure space and carrying out fracturing fluid pump and carry out fracturing work and provide effective guarantee, and gasbag weight is lighter simultaneously, can alleviate the weight of whole device to make whole device can carry more fracturing fluid under the bearing capacity of assurance haulage cable, reduce the frequency that lifting device carried out fracturing fluid replenishment, effectively guaranteed the operating duration of device at every turn.
Drawings
FIG. 1 is a flow chart of the operation process of the present invention;
FIG. 2 is a diagram of injection wells, production wells, and roadway connections;
FIG. 3 is a schematic illustration of the application of the fracturing assist apparatus of the present invention in a directional well;
FIG. 4 is a schematic view of a first perspective of a fracturing assist apparatus of the present invention;
FIG. 5 is a schematic diagram of a second view of a fracturing assist apparatus of the present invention;
FIG. 6 is a top view of the fracturing assist of the present invention;
FIG. 7 is an enlarged view of a portion of the structure of FIG. 6A in accordance with the present invention;
FIG. 8 is a schematic structural view of the main body block, the auxiliary tank, the solution chamber and other components in the invention;
FIG. 9 is an enlarged view of a portion of the structure of FIG. 8B in accordance with the present invention;
FIG. 10 is a schematic structural view of the main body block, the telescopic rod c, the coating film and other components in the invention;
FIG. 11 is a schematic view of the structure of the auxiliary tank, bi-directional pump, push plate, etc. in the present invention;
fig. 12 is an enlarged view of a portion of the structure of fig. 11C in accordance with the present invention.
In the figure:
1. a directional well; 1-1, roadway; 1-2, a heat collecting terminal;
201. a traction cable; 202. a connecting block; 203. an elliptical shaft disc; 204. a telescopic rod a; 205. auxiliary bar blocks; 206. a guide rod; 207. a guide groove; 208. a swinging bar; 209. a semicircular abutting block; 210. an extension rod;
301. a body block; 302. a telescopic rod b; 303. an abutment block; 304. an auxiliary groove; 305. a telescopic rod c; 306. a balloon bin; 307. a solution chamber; 308. a bi-directional pump; 309. a spring; 310. a pushing plate; 311. and (5) coating a film.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is described in further detail below with reference to the drawings and examples.
Please refer to fig. 1 and 2:
a method for mining dry and hot rock by closed circulation of a multilayer multi-branch horizontal well comprises the following steps:
step one: early preparation:
firstly, excavating two directional wells 1 to a geothermal reservoir of dry hot rock, wherein one directional well 1 is used as an injection well, the other directional well 1 is used as a exploitation well, and then tunneling a roadway 1-1 along different directions of the geothermal reservoir of dry hot rock under the directional well 1 so as to prepare for subsequent fracturing heat exchange;
step two: primary fracturing and secondary supplementary fracturing are carried out:
firstly, injecting a fracturing medium into an injection well, performing primary fracturing on a whole rock to generate cracks, and performing secondary supplementary fracturing on the cracks which are not ideal after the primary fracturing, wherein the secondary supplementary fracturing is completed by a fracturing auxiliary device;
step three: and (3) laying corresponding pipelines:
an injection pipeline is paved in the injection well for injecting a heat transfer medium, an output pipeline is paved in the exploitation well for outputting the heat transfer medium, a heat exchange pipeline is paved in the roadway 1-1, the injection pipeline, the heat exchange pipeline and the output pipeline are sequentially communicated to form a circulating pipeline, and the output pipeline is connected with the heat collection terminal 1-2;
step four: injecting a heat transfer medium and circularly completing geothermal exploitation:
and injecting a heat transfer medium into the injection pipeline, taking out the heat in the dry hot rock by the heat transfer medium, outputting the heat from the output pipeline, and finally collecting the heat taken out by the heat transfer medium in the output pipeline by the heat collecting terminal.
Please refer to fig. 3 to 12:
the fracturing auxiliary device in the second step comprises a stable supporting component and an auxiliary fracturing component arranged at the bottom end of the stable supporting component;
the stable supporting assembly comprises a traction rope 201, the traction rope 201 is mainly used for conveying the whole fracturing auxiliary device to a directional well 1 or a roadway 1-1, the device can be installed on a conveying machine so as to convey the whole fracturing auxiliary device to a corresponding working position, a connecting block 202 is fixedly connected to the bottom end of the traction rope 201, an elliptical shaft disc 203 is fixedly connected to the bottom end of the connecting block 202, two telescopic rods a204 are arranged on the elliptical shaft disc 203, the telescopic rods a204 are symmetrically arranged by taking the elliptical shaft disc 203 as a center, the telescopic rods a204 can be controlled to extend or retract by a control system of the device, the elliptical shaft disc 203 is symmetrically and fixedly connected with an auxiliary bar 205 by taking the elliptical shaft disc 203 as a center, the auxiliary bar 205 is fixedly connected to the elliptical shaft disc 203, two ends of the auxiliary bar 205 are fixedly connected with guide bars 206, a swinging bar 208 is arranged above the auxiliary bar 205, the inner ends of the swinging bars 208 are rotatably connected with an extension bar 210, the extension bar 210 is fixedly arranged on the telescopic bars a204, the swinging bars 208 swing around the connecting positions of the telescopic bars a main shaft disc and the extension bar 208 as rotation axes when moving, the swinging bars 206 are symmetrically arranged on the center, the guide bars 206 are matched with the guide bars 206, the guide bars are connected with the guide bars 206 in a sliding way, and the guide bars are connected with the inner surface of the guide bars 1 or the guide bars, the guide bars are in a 1-a rough circle, the main surface, the guide bar is in a 1, the sliding mode, and the guide bar is in a rough and the outer surface, and the guide bar is in a sliding mode, and the main groove is in contact with the guide groove, and the main groove 1, and the main groove;
the auxiliary fracturing assembly comprises a main body block 301, a visual camera is mounted on the main body block 301 and is mainly used for capturing and feeding back image information in a directional well 1 or a roadway 1-1, workers can determine an unqualified fracturing area through the fed back image information, the main body block 301 is rotationally connected to the bottom end of an elliptical shaft disc 203 through a rotating shaft, the rotating shaft is controlled by a control system to act, and the rotating shaft can be a main shaft of a motor, namely: the rotor of the motor is controlled to rotate, the rotor drives the rotating shaft to rotate, the telescopic rod b302 is fixedly connected to the left end face of the main body block 301, the telescopic rod b302 is controlled by a control system of the device to perform telescopic action, one end of the telescopic rod b302, which is far away from the main body block 301, is fixedly connected with the abutting block 303, the outer surface of the abutting block 303 is rough, the outer surface of the abutting block is an arc surface and is mainly used for increasing friction with the inner wall of the directional well 1 or the roadway 1-1, the stability of the device is improved, an auxiliary groove 304 is formed on the right side of the main body block 301, a telescopic rod c305 is fixedly connected in the auxiliary groove 304 at equal intervals, the telescopic rod c305 is controlled by a control system of the device to perform telescopic action, the outer ends of the telescopic rod c305 are respectively provided with a balloon cabin 306, an air bag is arranged in the balloon cabin 306, the air bag is supplemented by an air pump, and can be made of corrosion-resistant materials such as fluororubber, fluoroplastic and the like, the main body block 301 is internally provided with a solution cavity 307 in a ring of the auxiliary groove 304, the solution cavity 307 is filled with fracturing fluid, the solution cavity 307 is provided with a solution filling port, the bottom end of the solution cavity 307 is fixedly connected with a two-way pump 308, the two-way pump 308 is mainly used for transferring the fracturing fluid in the solution cavity 307, the inner wall of the solution cavity 307 is fixedly connected with springs 309 at equal intervals, the outer ends of the springs 309 are fixedly connected with a pushing plate 310, when the two-way pump 308 pumps the fracturing fluid out of the solution cavity 307, the springs 309 in a compressed state push the pushing plate 310 to move rightwards, referring to fig. 11, in the other case, when the two-way pump 308 pumps the fracturing fluid into the solution cavity 307, the pushing plate 310 moves leftwards, at the moment, the springs 309 are compressed, the telescopic rods c305 are fixedly connected with a covering film 311, each row of telescopic rods c305 are connected with a covering film 311, the covering film 311 can be made of fluorine rubber and other corrosion resistant materials, the wrapping film 311 is foldable, and the length of the wrapping film 311 after being unfolded is equal to the length of the fully-extended telescopic rod c305, and the wrapping film 311 is folded in the auxiliary groove 304 when not in use.
The working principle of the fracturing auxiliary device is as follows:
the initial state is as follows: the telescopic rod a204 is not contracted, the guide rod 206 is positioned in the guide groove 207 and at one end far away from the semicircular abutting block 209, the semicircular abutting block 209 is not abutted against the inner wall of the roadway 1-1 or the directional well 1, the telescopic rod b302 is not stretched, the abutting block 303 is not abutted against the inner wall of the roadway 1-1 or the directional well 1, the telescopic rod c305 and the bulge pocket 306 are positioned in the auxiliary groove 304, the spring 309 is in a compressed state, the right end surface containing cavity of the pushing plate 310 in the solution cavity 307 is filled with fracturing fluid, and the coating film 311 is folded in the auxiliary groove 304.
The following is a working process of the stable supporting component:
when the device is used, firstly, the whole device is placed in a directional well 1 or a roadway 1-1, the whole device is placed down by the aid of a conveying machine and a traction rope 201, when the traction rope 201 is placed down to a position where secondary supplement fracturing is needed, the telescopic rod a204 is controlled to shrink by an external control system, when the telescopic rod a204 is shrunk, the telescopic rod a204 pulls the telescopic rod 210 to move towards a direction close to a connecting block 202, at the moment, the telescopic rod 210 pulls the swinging rod 208 to move together, due to the arrangement of a guide rod 206 on an auxiliary rod block 205, during the movement of the swinging rod 208, the swinging rod 208 can expand and swing with the aid of a guide groove 207, during the expansion process, a semicircular abutting block 209 hinged to the outer end of the swinging rod 208 can gradually approach and abut against the inner wall of the directional well 1 or the roadway 1-1, further, due to the fact that the semicircular abutting block 209 is symmetrically provided with four semicircular abutting blocks 209 with the outer surfaces, the elliptical shaft disk 203 can be firmly stabilized in the roadway 1-1 or the directional well 1 under the assistance of the four semicircular abutting blocks 209 with the outer surfaces, so that the follow-up auxiliary fracturing assembly works can be provided for follow-up work;
furthermore, due to the traction cable 201 and the main body block 301, the auxiliary fracturing component can be quickly and accurately sent to the position where secondary supplementary fracturing is needed, and the operation mode is high in flexibility and low in limitation.
The following is the working process of the auxiliary fracturing assembly:
further, after the device is integrally stabilized to a required working position by the stabilizing support component, the control system of the device controls the expansion rod b302 to extend, the extending expansion rod b302 can bring the abutting block 303 to approach the inner wall of the roadway 1-1 or the directional well 1 and abut against the inner wall of the roadway 1-1 or the directional well 1, so that the main body block 301 is stabilized in an auxiliary mode, further, when the control system controls the expansion rod b302 to extend, the expansion rod c305 can gradually extend, and under the action of the air pump, the air bags in the expansion bag bin 306 are inflated, the expansion bag bin 306 approaching the inner wall of the roadway 1-1 or the directional well 1 can finally abut against the inner wall of the roadway 1-1 or the directional well 1, and the air bags in the expansion bag bin 306 are tightly attached to the wrapping film 311 and the inner wall of the roadway 1-1 or the directional well 1, at the moment, a closed cavity is formed by controlling the system control system, the liquid pump in the auxiliary tank 304 is filled into the closed cavity, the fracturing fluid in the auxiliary tank 304 is not required to be fully used, and the number of the fracturing fluid is not required to be fully wasted by the fracturing fluid in the corresponding step 1 through the control system, and the two-way is completely filled into the corresponding to the well 1 or the directional well 1, and the defect of the fracturing fluid is completely not required to be fully overcome, and the situation that the fracturing is completely is not required to be fully broken by the fracturing fluid is completely;
furthermore, after the fracturing operation is finished, the fracturing fluid remaining in the closed cavity is pumped into the auxiliary tank 304 by the bidirectional pump 308 again for recycling, so that the waste of the fracturing fluid is avoided, the frequency of lifting the supplementary fracturing fluid by the conveying machinery of the device is reduced, and the multi-place supplementary fracturing operation can be completed by one-time lowering;
further, through the setting of the bulge bag storehouse 306, when the gasbag that sets up therein takes place the bulge, the gasbag can self-adaptation tunnel 1-1 or directional well 1 inner wall, this is to forming the enclosure space and carrying out fracturing fluid pump and carry out fracturing work and provide effective guarantee, and gasbag weight is lighter simultaneously, can alleviate the weight of whole device, thereby make whole device can carry more fracturing fluid under the bearing capacity of guaranteeing haulage cable 201, reduce the frequency that the device carried out fracturing fluid to supply up, effectively guaranteed the operating duration of device at every turn.
The method is as follows:
the auxiliary fracturing assembly can be fixed at any position in the roadway 1-1 or the directional well 1 through the arrangement of the stable supporting assembly, meanwhile, as the main body block 301 is rotationally connected to the bottom end of the elliptical shaft disc 203 through the rotating shaft, after the position of the auxiliary fracturing assembly is adjusted and fixed, the working face of the auxiliary fracturing assembly can be enabled to be aligned to a position where secondary complementary cracking is needed through rotating the rotating shaft, and subsequent secondary cracking work is carried out, namely, through the integral arrangement, the secondary complementary fracturing work can be effectively carried out on the place where fracturing is incomplete in the prior art, and the operation can effectively and accurately complete the complementary cracking action without pouring a large amount of fracturing fluid into the directional well 1 and the roadway 1-1.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A method for mining dry and hot rock by closed circulation of a multilayer multi-branch horizontal well is characterized by comprising the following steps of: the method comprises the following steps:
step one: early preparation: firstly, two directional wells (1) are excavated to a geothermal reservoir of the dry hot rock, wherein one directional well (1) is used as an injection well, the other directional well (1) is used as a exploitation well, and then a roadway (1-1) is tunneled under the directional well (1) along different directions of the geothermal reservoir of the dry hot rock so as to prepare for subsequent fracturing heat exchange;
step two: primary fracturing and secondary supplementary fracturing are carried out:
firstly, injecting fracturing medium into an injection well, carrying out primary fracturing on a whole rock to generate cracks, then carrying out secondary supplementary fracturing on the cracks which are not ideal after primary fracturing, wherein the secondary supplementary fracturing is completed by a fracturing auxiliary device, the fracturing auxiliary device comprises a stable supporting component and an auxiliary fracturing component arranged at the bottom end of the stable supporting component, the stable supporting component comprises a traction cable (201), the bottom end of the traction cable (201) is fixedly connected with a connecting block (202), the bottom end of the connecting block (202) is fixedly connected with an elliptic shaft disc (203), the elliptic shaft disc (203) is provided with a telescopic rod a (204), the auxiliary fracturing component comprises a main body block (301), the main body block (301) is rotationally connected to the bottom end of the elliptic shaft disc (203) through a rotating shaft, the left end face of the main body block (301) is fixedly connected with a telescopic rod b (302), and one end of the telescopic rod b (302) far away from the main body block (301) is fixedly connected with a supporting block (303);
step three: and (3) laying corresponding pipelines:
an injection pipeline is paved in the injection well and used for injecting a heat transfer medium, an output pipeline is paved in the exploitation well and used for outputting the heat transfer medium, a heat exchange pipeline is paved in the roadway (1-1), the injection pipeline, the heat exchange pipeline and the output pipeline are sequentially communicated to form a circulating pipeline, and the output pipeline is connected with the heat exploitation terminal (1-2);
step four: injecting a heat transfer medium and circularly completing geothermal exploitation:
injecting a heat transfer medium into the injection pipeline, taking out heat in the dry hot rock by the heat transfer medium, outputting the heat from the output pipeline, and finally collecting the heat taken out by the heat transfer medium in the output pipeline by the heat collecting terminal;
the elliptical shaft disc (203) is symmetrically and fixedly connected with an auxiliary bar block (205) by taking the elliptical shaft disc as a center, two ends of the auxiliary bar block (205) are fixedly connected with guide rods (206), swing bars (208) are arranged above the auxiliary bar block (205), guide grooves (207) are formed in the swing bars (208), and the guide rods (206) are slidably connected in the guide grooves (207);
the outer end of the swinging strip (208) is hinged with a semicircular abutting block (209), the inner end of the swinging strip (208) is rotatably connected with an extension rod (210), and the extension rod (210) is fixed on the telescopic rod a (204);
an auxiliary groove (304) is formed in the right side of the main body block (301), telescopic rods c (305) are fixedly connected in the auxiliary groove (304) at equal intervals, and bulge bag bins (306) are arranged at the outer ends of the telescopic rods c (305);
a solution cavity (307) is formed in the main body block (301) and positioned in the ring of the auxiliary groove (304), and a bidirectional pump (308) is fixedly connected to the bottom end of the inner cavity of the solution cavity (307);
the inner wall equidistance fixedly connected with spring (309) of auxiliary tank (304), spring (309) outer end fixedly connected with is pushed board (310), outer end fixedly connected with coating film (311) of telescopic link c (305) medial surface.
2. The method for producing hot dry rock by closed cycle of multi-layer multi-branch horizontal well according to claim 1, wherein the method comprises the following steps: the solution cavity (307) is filled with fracturing fluid.
3. The method for producing hot dry rock by closed cycle of multi-layer multi-branch horizontal well according to claim 1, wherein the method comprises the following steps: the coating film (311) is made of fluororubber.
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| US20150176384A1 (en) * | 2013-12-24 | 2015-06-25 | Baker Hughes Incorporated | One Trip Multi-interval Plugging, Perforating and Fracking Method |
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