CN117948727B - Method for exploiting dry and hot rock by utilizing closed circulation of annular branch horizontal well - Google Patents
Method for exploiting dry and hot rock by utilizing closed circulation of annular branch horizontal well Download PDFInfo
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- 239000003921 oil Substances 0.000 claims description 27
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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 method for exploiting dry hot rock by using a closed cycle of an annular branch horizontal well, which relates to the technical field of dry hot rock exploitation and comprises a well body leakage detection mechanism and a filling and trimming mechanism, wherein the well body leakage detection mechanism and the filling and trimming mechanism are arranged, so that the damaged leakage part of a high heat conduction sleeve can be detected and timely repaired, the continuity of inspection and maintenance is improved, the total amount of filling materials input into a storage box is controlled after the size of the damaged part is detected by the well body leakage detection mechanism, the sufficiency of the filling materials is ensured, the repairing effect is better, meanwhile, unnecessary material waste is reduced, the cost is saved, the damaged part can be timely repaired to prevent further damage of the high heat conduction sleeve, the service life of the high heat conduction sleeve is prolonged, and the maintenance cost is reduced.
Description
Technical Field
The invention relates to the technical field of dry hot rock exploitation, in particular to a method for exploiting dry hot rock by utilizing closed circulation of a horizontal well with annular branches.
Background
The annular branch horizontal well closed cycle exploitation dry hot rock is an emerging geothermal energy exploitation technology, is mainly used for exploiting deep buried dry hot rock resources, the dry hot rock is rock containing abundant heat energy, the dry hot rock is compact and waterproof, no fluid or only a small amount of underground fluid exists in the dry hot rock, exploitation of the dry hot rock has great potential, sustainable clean energy can be provided, and the development of the annular branch horizontal well closed cycle exploitation technology can further promote the utilization of the dry hot rock energy and contributes to energy transformation and environmental protection.
In the exploitation process, due to the influence of geological conditions, drilling technology, equipment ageing and other factors, the casing in the well body may have damage leakage conditions, and the damage leakage may cause a series of problems such as resource leakage, environmental pollution, production interruption and the like, so that in order to increase the service life of the exploited well body, it is important to discover and repair the damage leakage positions in time, and the traditional well body leakage detection method mainly depends on manual inspection and periodical pressure test (i.e. injecting gas into the well body, judging whether the well body has cracks through air pressure after sealing the well body), however, the methods cannot achieve continuity of inspection and maintenance, so that a more effective repair method is needed to solve the problem.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for exploiting dry and hot rock by using a closed cycle of a ring-shaped branch horizontal well, which aims 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 exploiting dry and hot rock by using closed circulation of a circular branch horizontal well comprises the following steps:
Step one: developing regional geothermal geological survey and comprehensive geophysical survey, delineating a dry hot rock survey development target area, and selecting a dry hot rock heat storage layer with the thickness of more than 400m and the temperature of more than 180 ℃ as a mining object;
Step two: drilling a main vertical well to the top surface of the dry hot rock heat storage layer by adopting a conventional drilling tool in a ground area above the selected dry hot rock heat storage layer, putting a high heat conduction sleeve into the main vertical well, and cementing the main vertical well with cement slurry;
step three: drilling horizontal wells in different directions by utilizing a deflecting tool to deflect at the top surface of the dry hot rock heat storage layer, and controlling the drilling azimuth and the distance of the horizontal section by using a measurement while drilling system and a borehole track control system in the drilling process, wherein the length of the horizontal well is controlled to be 500-2000 m;
Step four: drilling a secondary vertical well at the bottom center of a main vertical well on the top surface of the dry-hot rock heat storage layer, wherein the secondary vertical well is communicated with the main vertical well and the horizontal well;
step five: a heat insulation oil pipe is arranged in the center of the main vertical well, so that a heat production fluid is produced;
Step six: pressurizing the heat collecting fluid through a booster pump, pumping the heat collecting fluid from the oil sleeve annulus, and pumping the heat collecting fluid subjected to sufficient heat exchange through a water pump;
Step seven: thermoelectric conversion is carried out by using a geothermal power generation system on the ground, so that power generation is realized;
Step eight: according to the working requirements, the periodic pipeline leakage inspection and repair is carried out, and the method comprises the following steps:
Preliminary preparation: taking out the heat insulation oil pipe and the water suction pump, putting the well body leakage detection mechanism and the filling and trimming mechanism into the high heat conduction sleeve by using the external lifting machine, wherein the well body leakage detection mechanism comprises a rotary lifting machine, the rotary lifting machine is fixedly connected with a veneering telescopic rod, one end of the veneering telescopic rod, which is far away from the rotary lifting machine, is fixedly provided with a functional box, a storage box is fixedly connected in the functional box, the upper end of the storage box is fixedly connected with a blanking pipe, the blanking pipe penetrates through the functional box and extends upwards, the functional box is fixedly connected with an air pump, the upper end of the functional box is fixedly connected with a detection barrel, the detection barrel is communicated with the functional box, a floating block is connected in the detection barrel, the upper end of the floating block is fixedly connected with a magnet and a touch block, the top of the inner side of the detection barrel is fixedly connected with a second switch, three Hall switches are fixedly connected in the inner wall of the detection barrel, one end of the hose, which is far away from the rotary lifting machine, is fixedly connected with a movable structure, the laminating body is arranged on one side of the storage box, which is far away from the rotary lifting machine, and is fixedly connected with the movable structure, and the upper heat conduction sleeve is driven by the veneering telescopic rod;
During the working process: the air pump is used for injecting air into the functional box, after the air is injected, the change of the air pressure in the functional box is detected through the detection barrel, the floating block, the touch block and the second switch so as to detect whether the high heat conduction sleeve pipe at the joint of the functional box is damaged or not, then the detection result is fed back to the display, after the position of the damage is determined, the external controller connected with the display is used for controlling the external discharging device to inject filling materials into the hose, then under the action of the extraction pump arranged in the hose, the filling materials are filled into the damage, the joint body is controlled to reciprocate up and down, the filling materials at the damage are scraped and leveled through the joint body, and the heat insulation oil pipe and the water suction pump are put into the main vertical well after the repair is completed.
Preferably, the heat insulation oil pipe adopts a vacuum heat insulation oil pipe, the heat conductivity coefficient of the heat insulation oil pipe is below 0.04W/(m.K), and the geothermal power generation system adopts a direct power generation mode of double-stage flash evaporation.
Preferably, the well body leakage detection mechanism comprises a rotary lifter, four veneer telescopic links that the symmetry set up of rotary lifter fixedly connected with, every veneer telescopic link keeps away from the equal fixedly connected with function box of one end of rotary lifter, every equal fixedly connected with bin in the function box, every equal fixedly connected with unloading pipe of upper end of bin, bin and unloading pipe intercommunication, every the unloading pipe all runs through adjacent function box and upwards extends, every equal fixedly connected with air pump of function box inner chamber, every equal fixedly connected with of upper end of function box detects the bucket, every detect the bucket all with adjacent function box intercommunication, the slip connection has the push plate in the bin, the inboard fixedly connected with support frame of bin, the support frame is provided with two, two the equal rotation of support frame is connected with the anti-rotation yoke dish, two one side that anti-rotation yoke dish is close to each other all is provided with the locating piece, two the equal cover in the outside is equipped with the locating piece post, two equal fixedly connected with of equal sliding connection of push plate with the push plate of two adjacent veneer post and two.
Preferably, the filling and trimming mechanism comprises a fixed bottom plate, a pushing telescopic rod, a bonding body and a moving structure, wherein the moving structure comprises a driving screw rod, a first Z-shaped gear plate, a first sliding groove plate, a first gear, a first connecting rod, a second gear, a second Z-shaped gear plate and a second sliding groove plate, one side, far away from the rotary lifter, of each storage box is fixedly connected with the fixed bottom plate, the upper end of the fixed bottom plate is rotationally connected with the driving screw rod, one side, close to the driving screw rod, of the storage box is fixedly provided with the first sliding groove plate, the first sliding groove plate is provided with a first Z-shaped gear plate in a sliding manner, one side, close to the driving screw rod, of the first Z-shaped gear plate is provided with a thread groove matched with the driving screw rod, the external thread of the driving screw rod is in threaded fit with the thread groove arranged on the first Z-shaped gear plate, the left side and the right side of the first Z-shaped gear plate are fixedly connected with symmetrically arranged racks I, the left side and the right side of the first sliding groove plate are respectively and rotationally connected with first gears, the two racks I are respectively meshed with the two first gears, one side of the storage box, which is far away from the rotary lifter, is provided with a second sliding groove plate in a sliding way, the second sliding groove plate is provided with a second Z-shaped gear plate in a sliding way, the left side and the right side of the second sliding groove plate are respectively and rotationally connected with second gears, the two first gears are respectively and rotationally connected with a first connecting rod, the two second connecting rods are respectively and rotationally connected with adjacent first connecting rods, the left side and the right side of the second Z-shaped gear plate are respectively meshed with symmetrically arranged racks II, the push telescopic rod is fixedly connected with the second chute plate, one end of the push telescopic rod, which is far away from the second chute plate, is fixedly connected with a fitting body, the fitting body is fixedly connected with a silica gel sheet, and the silica gel sheet is correspondingly arranged at the position of the hose.
Preferably, an oblique scraping plate is arranged on one side, far away from the pushing telescopic rod, of the attaching body.
Preferably, the laminating body is fixedly provided with five hoses and five silica gel sheets, one end of the five hoses, which is far away from the laminating body, is communicated with the adjacent storage box, and the positions of the five silica gel sheets are respectively corresponding to the positions of the five hoses.
Preferably, the upper end of the attaching body is fixedly connected with a flow rate monitor, and the flow rate monitor is used for detecting the flow rate of the filling material in the hose.
Preferably, the flow velocity monitor is externally sleeved with a housing.
Compared with the prior art, the invention provides a method for exploiting dry and hot rock by using the closed cycle of the annular branch horizontal well, which has the following beneficial effects:
Through the arrangement of the well body leakage detection mechanism and the filling and trimming mechanism, the damaged leakage part of the high-heat-conductivity sleeve can be detected and timely repaired, and the continuity of inspection and maintenance is improved.
The operator controls the total amount of filling materials input into the storage box according to the feedback of the size of the damaged part of the high-heat-conductivity sleeve, ensures sufficient filling materials, can enable the repairing effect to be better, can reduce unnecessary material waste, saves material cost, knows the size of the damaged part and can help evaluate the repairing feasibility, if the damaged part is too large, other alternative schemes can be considered when the repairing operation becomes difficult or impossible, unnecessary repairing operation is reduced, and the working efficiency is improved.
Through the slant scraper blade that the laminating body front end set up, carry out the flattening to repair the department after repairing, can make repair department and high heat conduction sleeve pipe inner wall surface around keep unanimous, improve the pleasing to the eye degree and the quality of repairing, the flattening surface can reduce the adhesion between repair department and substances such as fluid, solid particle, can improve repair department's anticorrosive performance, makes repair department more easily detect and maintain.
Drawings
FIG. 1 is a schematic diagram of a loop-branch horizontal well closed-loop production dry-hot rock system;
FIG. 2 is a schematic diagram of a drilling perspective of a closed loop production dry rock system for a circular branch horizontal well;
FIG. 3 is a schematic diagram of the overall structure of the present invention;
FIG. 4 is a schematic diagram of the overall internal structure of the present invention;
FIG. 5 is a schematic view of the functional box, the detection barrel, the floating block and other components of the invention;
FIG. 6 is a schematic diagram of the structure of the detection barrel, hall switch, second switch, etc. of the present invention;
FIG. 7 is a schematic view of the structure of the storage case, push plate, support frame, scotch yoke, etc. of the present invention;
FIG. 8 is an enlarged block diagram of the portion A of FIG. 7 in accordance with the present invention;
FIG. 9 is a schematic structural view of the fixed bottom plate, the first runner plate, the second runner plate, and the like of the present invention;
FIG. 10 is a schematic view of the structure of the components of the drive screw, push telescoping rod, hose, etc. of the present invention;
FIG. 11 is an enlarged block diagram of the portion B of FIG. 10 according to the present invention;
Fig. 12 is a schematic structural view of the fitting body, hose, silicone sheet, and other components of the present invention.
In the figure:
1, a high heat conduction sleeve; 201, rotating an elevator; 202, overlaying a telescopic rod; 203, a functional box; 204, a storage box; 205, blanking pipe; 206, an air pump; 207, detecting a barrel; 208, floating blocks; 209, a magnet; 210, touching the block; 211, a hall switch; 212, a second switch; 213, pushing the plate; 214, a support frame; 215, a scotch yoke; 216, a spool; 217, positioning blocks; 301, fixing a bottom plate; 302, driving a screw rod; 303, a first Z-shaped gear plate; 304, a first runner plate; 3051, a first gear; 3052, a first link; 3053, second link; 3054, a second gear; 306, a second Z-shaped gear plate; 307, a second runner plate; 308, pushing the telescopic rod; 309, a bonded body; 310, a hose; 311, a silicon sheet; 312, a flow rate monitor; 313, housing; 1-1, a main vertical well; 2-1, a flow direction of the heat collection fluid; 4, a horizontal well; 5, a secondary vertical well; 6, insulating oil pipes; 7, a geothermal power generation system; 8, a water pump; 9, a booster pump; and 10, oil sleeve annulus.
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.
Referring to fig. 1 to 12, a method for exploiting dry and hot rock by using closed loop of a circular branch horizontal well includes the following steps:
Step one: developing regional geothermal geological survey and comprehensive geophysical survey, delineating a dry hot rock survey development target area, and selecting a dry hot rock heat storage layer with the thickness of more than 400m and the temperature of more than 180 ℃ as a mining object;
step two: drilling a main vertical well 1-1 to the top surface of the dry hot rock heat storage layer by adopting a conventional drilling tool in a ground area above the selected dry hot rock heat storage layer, putting a high heat conduction sleeve 1 in, and cementing the well by using cement slurry with high heat conduction coefficient;
Step three: the method comprises the steps of (1) directionally deflecting the top surface of a dry hot rock heat storage layer by utilizing a deflecting tool, drilling horizontal wells 4 in different directions, and controlling the drilling direction and the drilling distance of a horizontal section by a measurement while drilling system and a borehole track control system in the drilling process, wherein the length of the horizontal wells 4 is controlled to be 500-2000 m;
step four: drilling a secondary vertical well 5 at the bottom center of a main vertical well 1-1 on the top surface of the dry-hot rock heat storage layer, wherein the secondary vertical well 5 enables the main vertical well 1-1 to form closed communication with a horizontal well 4;
step five: a heat insulation oil pipe 6 is arranged in the center of the main vertical well 1-1, so that a heat production fluid is produced;
Step six: pressurizing the heat collecting fluid through a booster pump 9 and pumping the heat collecting fluid from an oil sleeve annulus 10, pumping the heat collecting fluid which has undergone sufficient heat exchange through a water pump 8, and placing the water pump 8 at the bottom of a main vertical well 1-1 to collect high temperature water, wherein the flow direction of the heat collecting fluid can refer to the flow direction 2-1 of the heat collecting fluid in the drawing;
step seven: the geothermal power generation system 7 on the ground is utilized for thermoelectric conversion, so that cyclic power generation is realized;
Step eight: according to the working requirements, the periodic pipeline leakage inspection and repair is carried out, and the method comprises the following steps:
Preliminary preparation: taking out the heat insulation oil pipe 6 and the water suction pump 8, then placing a well body leakage detection mechanism and a filling and trimming mechanism into the high heat conduction sleeve 1 by using an external lifting machine, wherein the well body leakage detection mechanism comprises a rotary lifting machine 201, the rotary lifting machine 201 is fixedly connected with a faced telescopic rod 202, one end of the faced telescopic rod 202, which is far away from the rotary lifting machine 201, is fixedly provided with a functional box 203, a storage box 204 is fixedly connected in the functional box 203, the upper end of the storage box 204 is fixedly connected with a blanking pipe 205, the blanking pipe 205 penetrates through the functional box 203 and extends upwards, the functional box 203 is fixedly connected with an air pump 206, the upper end of the functional box 203 is fixedly connected with a detection barrel 207, the detection barrel 207 is communicated with the functional box 203, the detection barrel 207 is internally and is internally connected with a floating block 208, the upper end of the floating block 208 is fixedly connected with a magnet 209 and a touch block 210, the inner side of the detection barrel 207 is fixedly connected with a second switch 212, the inner wall of the detection barrel 207 is fixedly connected with three Hall switches 211, the storage box 204 is communicated with a hose 310, one end, which is far away from the storage box 204, is fixedly connected with a body 309, one side, which is far away from the rotary lifting machine 201, is provided with the functional box 201, is fixedly connected with a movable body 309, and is arranged on the inner wall of the movable body 202, which is driven by the functional box 203, and is adhered to the high heat conduction sleeve 1 by the high heat conduction sleeve;
During the working process: after the gas is infused into the functional box 203 through the gas pump 206, the change of the internal gas pressure of the functional box 203 is detected through the detection barrel 207, the floating block 208, the touch block 210 and the second switch 212 so as to detect whether the high heat conduction sleeve 1 attached to the functional box 203 is damaged or not, then the detection result is fed back to the display, after the position of the damaged position is determined, the external blanking device is controlled to infuse the filling material into the hose 310 through the external controller connected with the display, then the filling material is filled into the damaged position to be repaired under the action of the small-sized extraction pump arranged in the hose 310, then the attaching body 309 is controlled to reciprocate up and down, the filling material at the damaged position is scraped and leveled back and forth through the attaching body 309, and the heat insulation oil pipe 6 and the water pump 8 are then lowered into the main vertical well 1-1 after the repair is completed.
The main vertical well 1-1 adopts a three-opening structure, uses a phi 660.4mm drill bit to drill to 800m, a phi 508.0mm sleeve is put into to seal a surface water layer, then uses a phi 444.5mm drill bit to drill to 1800m or so, a phi 339.7mm sleeve is put into to seal an upper sandstone bottom layer, the three-opening structure uses a phi 311.0mm drill bit to drill, the well is completed with naked eyes, wherein the heat conductivity of the sleeve is above 120W/(m.K), the heat conductivity of cement paste used for cementing is above 5W/(m.K), the length of the horizontal well 4 is greater than or equal to 800m, and the heat exchange time and the heat exchange area of a heat collecting medium can be increased by increasing the length of the horizontal well 4, so that the heat exchange efficiency is improved.
The heat insulation oil pipe 6 adopts a vacuum heat insulation oil pipe, the heat conductivity coefficient of the heat insulation oil pipe is below 0.04W/(m.K), the heat exchange between the extracted high Wen Caire medium and the inflow low-temperature heat extraction medium can be reduced, the heat extraction efficiency is improved, the geothermal power generation system 7 adopts a direct power generation mode of double-stage flash evaporation, and the heat insulation oil pipe has the advantages of simple structure and high heat efficiency.
Referring to fig. 1 to 12, a method for exploiting dry rock by closed cycle of a horizontal well with annular branches includes a well body leakage detection mechanism and a filling and trimming mechanism, wherein the well body leakage detection mechanism and the filling and trimming mechanism are used for detecting a high heat conduction sleeve 1, and before the well body leakage detection mechanism and the filling and trimming mechanism are used for detection, a heat insulation oil pipe 6 and a water suction pump 8 are taken out, and the well body leakage detection mechanism and the filling and trimming mechanism are hoisted and conveyed to a detection or repairing position by an external hoisting machine;
The well body leakage detection mechanism is used for detecting whether the heat conduction sleeve 1 is broken or not, the well body leakage detection mechanism comprises a rotary lifter 201, four symmetrically arranged veneer telescopic rods 202 are fixedly connected with the rotary lifter 201, one ends of the four veneer telescopic rods 202 far away from the rotary lifter 201 are fixedly connected with a functional box 203, the rotary lifter 201 is mainly used for driving the veneer telescopic rods 202 and the functional box 203 to rotate, the veneer telescopic rods 202 are mainly used for driving the functional box 203 to be attached to the inner wall of the high heat conduction sleeve 1, the radian of the functional box 203 is correspondingly arranged with that of the inner wall of the high heat conduction sleeve 1, each functional box 203 is fixedly connected with a storage box 204, the storage boxes 204 are mainly used for storing filling materials, the upper ends of the storage boxes 204 are fixedly connected with a discharging pipe 205, each storage box 204 is communicated with the adjacent discharging pipe 205, a one-way valve is arranged in the discharging pipe 205, the discharging pipe 205 is mainly used for operators to add the filling materials into the storage boxes 204, each discharging pipe 205 penetrates through the adjacent functional box 203 and extends upwards, one side of the inner cavity of each functional box 203 is fixedly connected with an air pump 206, the air pump 206 is used for infusing the air outside the functional box 203 into the functional box 203, the upper end of each functional box 203 is fixedly connected with a detection barrel 207, a through groove I is formed between each detection barrel 207 and the adjacent functional box 203, the through groove I is used for communicating the detection barrel 207 with the functional box 203, both sides of the inner wall of each detection barrel 207 are provided with sliding grooves, the sliding grooves of the detection barrels 207 are slidably connected with a floating block 208, the diameter of the floating block 208 is matched with the diameter of the inner ring of the detection barrel 207, the floating block 208 is in sealing connection with the detection barrel 207, the upper end of the floating block 208 is provided with a ring groove, a magnet 209 is fixedly connected in the ring groove of the floating block 208, the magnet 209 is mainly used for interacting with a Hall switch 211 to feed back the damage condition of the high heat conduction sleeve 1, the circle center of the upper end of the floating block 208 is fixedly connected with a touch block 210, the circle center of the top of the inner cavity of the detection barrel 207 is fixedly connected with a second switch 212, the touch block 210 corresponds to the second switch 212 in position, the inner wall of the detection barrel 207 is fixedly connected with three Hall switches 211 in equal distance, the Hall switches 211 and the second switch 212 are connected with an external display, a veneering telescopic rod 202, an air pump 206, the Hall switches 211, the second switch 212, the external display and an external blanking device are electrically connected with an external controller, the upper end of a blanking pipe 205 is connected with the external blanking device, a magnet 209 is matched with the Hall switches 211 for use, a push plate 213 is connected in the inner sliding way of the storage box 204, two support frames 214 are fixedly connected to one side, close to the veneering telescopic rod 202, of the inner cavity of the storage box 204, the two support frames 214 are cross-shaped supports, a rotation-stopping yoke plate 215 is connected to the centers of the two support frames 214 in a rotating way, positioning blocks 217 are arranged on one side, opposite to the two rotation-stopping yoke plates 215, of each positioning block 217, sliding columns 216 are sleeved outside the two positioning blocks 217, the two sliding columns 216 are connected with the adjacent positioning blocks 217 in a sliding way, one side, far away from the veneering telescopic rod 202, of each sliding column 216 is fixedly connected with the push plate 213, the sliding column 216 is mainly used for pushing the pushing plate 213, and the size of the pushing plate 213 is matched with the inner cavity of the storage box 204.
The filling and trimming mechanism is used for transporting materials and filling and leveling broken parts of the high heat conduction sleeve 1 and comprises a fixed bottom plate 301, a pushing telescopic rod 308, a fitting body 309 and a moving structure, wherein the moving structure comprises a driving screw rod 302, a first Z-shaped gear plate 303, a first sliding groove plate 304, a first gear 3051, a first connecting rod 3052, a second connecting rod 3053, a second gear 3054, a second Z-shaped gear plate 306 and a second sliding groove plate 307, the fixed bottom plate 301 is fixedly connected to one side of the storage box 204 far away from the rotary lifter 201, the upper end of the fixed bottom plate 301 is rotatably connected with the driving screw rod 302, a first sliding groove plate 304 is fixedly arranged on one side of the storage box 204, which is close to the driving screw rod 302, a first Z-shaped gear plate 303 is arranged on the first sliding groove plate 304 in a sliding way, a first sliding block is arranged on one side of the first Z-shaped gear plate 303, which is close to the first sliding groove plate 304, a second through groove is formed in the first sliding groove plate 304, the first sliding block arranged on the first Z-shaped gear plate 303 is connected in the second through groove formed in the first sliding groove plate 304 in a sliding way, a thread groove matched with the driving screw rod 302 is formed on one side of the first Z-shaped gear plate 303, external threads of the driving screw rod 302 are connected with the thread groove arranged on the first Z-shaped gear plate 303 in a thread fit way, when the driving screw rod 302 rotates, the external thread of the driving screw rod 302 can extrude and push the first Z-shaped gear plate 303 to move, the left side and the right side of the first Z-shaped gear plate 303 are fixedly connected with symmetrically arranged racks I, the left side and the right side of the first sliding groove plate 304 are rotationally connected with a first gear 3051, the two racks I are respectively meshed with the two first gears 3051, a second sliding groove plate 307 is arranged on one side of the storage box 204 far away from the rotary lifter 201 in a sliding way, a second Z-shaped gear plate 306 is arranged on the second sliding groove plate 307 in a sliding way, a sliding block II is arranged on one side of the second Z-shaped gear plate 306 close to the second sliding groove plate 307, the second sliding groove plate 307 is provided with a through groove III, a sliding block II arranged on the second Z-shaped gear plate 306 is connected in the through groove III arranged on the second sliding groove plate 307 in a sliding way, the left side and the right side of the second sliding groove plate 307 are respectively and rotationally connected with a second gear 3054, two first gears 3051 are respectively and fixedly connected with a first connecting rod 3052, two second gears 3054 are respectively and fixedly connected with a second connecting rod 3053, the two second connecting rods 3053 are respectively and rotationally connected with adjacent first connecting rods 3052, racks II which are symmetrically arranged are fixedly connected on the left side and the right side of the second Z-shaped gear plate 306 and are respectively meshed with the two second gears 3054, the two pushing telescopic rods 308 are arranged, the two pushing telescopic rods 308 are fixedly connected with the second chute plate 307, one ends of the two pushing telescopic rods 308, which are far away from the second chute plate 307, are fixedly connected with the attaching body 309, the upper end and the lower end of one side, which is far away from the pushing telescopic rods 308, of the attaching body 309 are provided with oblique scraping plates, the radian of each oblique scraping plate is correspondingly arranged with the radian of the inner wall of the high heat conduction sleeve 1, the attaching body 309 is provided with a through groove IV, a hose 310 is fixedly arranged in the through groove IV of the attaching body 309, the hose 310 penetrates through the attaching body 309, one end, which is far away from the attaching body 309, of the hose 310 is fixedly connected with the storage box 204, the hose 310 is communicated with the storage tank 204, the joint body 309 is provided with five hoses 310 altogether, each hose 310 is internally provided with a small-sized pumping pump for pumping filling materials in the storage tank 204, the position of the joint body 309 provided with a through groove four is fixedly connected with a silica gel sheet 311, each silica gel sheet 311 is composed of two symmetrically arranged semicircular sheets, after filling, the well body leakage detection mechanism and the filling and trimming mechanism are taken out from the well, the device is cleaned by an operator, the joint of the hose 310 and the silica gel sheet 311 is prevented from being blocked due to residual and hardening of filling materials, the upper end of the attaching body 309 is fixedly connected with a flow rate monitor 312, the flow rate monitor 312 is used for detecting the flow rate of the filling material in the hose 310, the attaching body 309 is provided with five flow rate monitors 312, the five flow rate monitors 312 respectively correspond to the positions of the five hoses 310, a housing 313 is sleeved outside each flow rate monitor 312, and the housing 313 is used for protecting the flow rate monitor 312;
Through setting up first gear 3051, first connecting rod 3052, second connecting rod 3053 and second gear 3054, can drive the second runner 307 and reciprocate, compare in the direct telescopic structure such as electric putter, electric putter itself has a take the altitude, and receive the restriction of own altitude, its output can't reach the region below the own altitude, and this gear structure is the length sum that can extend to two connecting rods the highest, and the minimum position that can reach is also lower.
The working principle of the above embodiment is as follows:
When the device is used, firstly, the heat-collecting fluid in the main vertical well 1-1 is pumped out by the heat-insulating oil pipe 6 and the water pump 8, then the heat-insulating oil pipe 6 and the water pump 8 are taken out, the well body leakage detection mechanism and the filling and trimming mechanism are placed in the high heat-conducting sleeve 1 by using an external lifting machine, then the four faced telescopic rods 202 are controlled to be started simultaneously by an external controller, the four faced telescopic rods 202 which are symmetrically arranged drive the four functional boxes 203 to be close to the inner wall of the high heat-conducting sleeve 1, the four functional boxes 203 can be bonded with the inner wall of the high heat-conducting sleeve 1 so as to position and fix the device, the air pump 206 is controlled to be started after the functional boxes 203 are bonded and sealed with the inner wall of the high heat-conducting sleeve 1, and the air pump 206 is used for infusing external air into the inner cavity of the functional boxes 203;
If the high heat conduction sleeve 1 at the joint of the functional box 203 is not damaged, when gas is infused, the air pressure in the functional box 203 is enhanced, the floating block 208 can be pushed to rise upwards, the air pump 206 continuously infuses gas into the functional box 203, so that the touch block 210 at the upper end of the floating block 208 is contacted with the second switch 212 at the top of the inner cavity of the detection barrel 207, at the moment, the air pump 206 stops delivering gas into the functional box 203, if the high heat conduction sleeve 1 does not have a gap, the functional box 203 is in a closed state, the internal gas cannot leak, so that the touch block 210 continuously contacts with the second switch 212, the high heat conduction sleeve 1 is complete, no repair is needed, the detection result is displayed to an operator through an external display screen, the height of the functional box 203 can be adjusted by using an external lifter, and the angle of the functional box 203 is adjusted by using the rotation of the rotary lifter 201, so that other parts of the inner wall of the high heat conduction sleeve 1 are detected by using the functional box 203;
If the high heat conduction sleeve 1 at the joint of the functional box 203 is damaged, after the touch block 210 contacts with the second switch 212 and the air pump 206 stops delivering air into the functional box 203, the air in the functional box 203 can leak through the notch, so that the air pressure in the functional box 203 is reduced, the floating block 208 moves downwards in the detection barrel 207, the touch block 210 is separated from the second switch 212 when the floating block 208 moves downwards, the high heat conduction sleeve 1 is damaged, the magnet 209 is driven to move together when the floating block 208 moves downwards, three Hall switches 211 are fixedly connected to the inner wall of the detection barrel 207 at equal intervals, an electric reaction is generated when the magnet 209 approaches to the Hall switches 211, so that the Hall switches 211 are electrified and an electrified signal is fed back to an external display, the speed of the air leakage can be calculated according to the time of the separation of the touch block 210 and the second switch 212 and the electrified time of each Hall switch 211, the size of the damaged position of the high heat conduction sleeve 1 can be finally calculated to prompt an operator to transport a proper amount of filling material, when the damaged position is detected, an external lifter and the position of the functional box 203 can be adjusted by the external lifter and the multiple groups of positions can be detected about the damaged position of the inner wall 203 can be detected for multiple times, and multiple repair results can be determined;
The external controller connected with the display controls the external blanking device to downwards infuse the filling material with the required volume through the blanking pipe 205, so that the filling material is added into the storage tank 204, meanwhile, the anti-rotation yoke 215 is driven by the driving motor to rotate, so that the positioning block 217 is utilized to drive the sliding column 216 and the pushing plate 213 to reciprocate, the pushing plate 213 is utilized to push the filling material in the storage tank 204 to the position of the hose 310, the pushing plate 213 can squeeze the filling material when being far away from the veneering telescopic rod 202, so that the filling material better enters the hose 310, the pushing plate 213 can assist the filling material to enter the storage tank 204 from the blanking pipe 205 when being close to the veneering telescopic rod 202, meanwhile, the pushing telescopic rod 308 is controlled to be opened, the laminating body 309 is pushed to be laminated with the inner wall of the high heat conduction sleeve 1 by utilizing the pushing telescopic rod 308, and then the pumping pump in the hose 310 is controlled to be opened, the filling material in the storage box 204 is extracted to one end of the hose 310 close to the silica gel sheet 311, the filling material can jack up the silica gel sheet 311, the filling material flows out from between the two semicircular sheets and fills up the damaged part of the high heat conduction sleeve 1, the housing 313 can prevent the filling material from influencing the flow velocity monitor 312, after the filling material is output, under the action of the elastic material of the silica gel sheet 311, the two semicircular sheets can automatically close to seal the hose 310 to prevent the filling material from flowing back, then the driving screw 302 is driven by an external motor to rotate, the driving screw 302 rotates to drive the first Z-shaped gear plate 303 to move from left to right, thereby driving the two first gears 3051 and the two first connecting rods 3052 to rotate, at the moment, the two first connecting rods 3052 can jack up the two second connecting rods 3053, the two second gears 3054 and the second chute plate 307, simultaneously, the two second gears 3054 are driven to rotate so that the second Z-shaped gear plate 306 moves from right to left, when the second chute plate 307 moves up to the highest point, the driving screw rod 302 is controlled by the external controller to start rotating reversely, the second chute plate 307 can be driven to move downwards, the oblique scraping plate on the attaching body 309 can scrape and level the filling material attached to the inner wall of the high heat conduction sleeve 1 while the second chute plate 307 reciprocates up and down, and the flow velocity of the filling material inside the hose 310 is detected through the flow velocity monitor 312 so as to further monitor the filling condition of the damaged part.
Through well body leakage detection mechanism and fill the setting of repairing mechanism, can in time repair the damage after detecting the damage, improved the continuity of inspection and maintenance, through the cooperation of detecting barrel 207 and inner structure and use, can feed back the gap size of damage, know the size of damage can help the feasibility of aassessment repair, if the damage is too big, repair operation becomes difficult or when infeasible, can consider other alternatives, reduces unnecessary repair operation, improves work efficiency.
It is noted that relational terms such as first and second, and the like are 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 (8)
1. A method for exploiting dry and hot rock by using closed circulation of a circular branch horizontal well, which is characterized by comprising the following steps:
Step one: developing regional geothermal geological survey and comprehensive geophysical survey, delineating a dry hot rock survey development target area, and selecting a dry hot rock heat storage layer with the thickness of more than 400m and the temperature of more than 180 ℃ as a mining object;
step two: drilling a main vertical well (1-1) to the top surface of the dry hot rock heat storage layer by using a drilling tool in a ground area above the selected dry hot rock heat storage layer, putting a high heat conduction sleeve (1) in, and cementing with cement slurry;
step three: the method comprises the steps of directionally deflecting the top surface of a dry hot rock heat storage layer by utilizing a deflecting tool, drilling a horizontal well (4), and controlling the drilling direction and the drilling distance of a horizontal section in the drilling process by a measurement while drilling system and a borehole track control system, wherein the length of the horizontal well (4) is controlled to be 500-2000 m;
Step four: drilling a secondary vertical well (5) at the bottom center of a main vertical well (1-1) on the top surface of the dry-hot rock heat storage layer, wherein the secondary vertical well (5) is used for communicating the main vertical well (1-1) with a horizontal well (4);
Step five: a heat insulation oil pipe (6) is arranged in the center of the main vertical well (1-1), so that a heat production fluid is produced;
Step six: pressurizing the heat collecting fluid through a booster pump (9) and pumping the heat collecting fluid from an oil sleeve annulus (10), and pumping the heat collecting fluid subjected to sufficient heat exchange through a water pump (8);
step seven: thermoelectric conversion is carried out by using a geothermal power generation system (7) on the ground to realize power generation;
Step eight: according to the working requirements, the periodic pipeline leakage inspection and repair is carried out, and the method comprises the following steps:
Preliminary preparation: taking out the heat insulation oil pipe (6) and the water suction pump (8), then utilizing an external elevator to put a well body leakage detection mechanism and a filling and trimming mechanism into the high heat conduction sleeve (1), wherein the well body leakage detection mechanism comprises a rotary elevator (201), the rotary elevator (201) is fixedly connected with a faced telescopic rod (202), one end of the faced telescopic rod (202) far away from the rotary elevator (201) is fixedly provided with a functional box (203), the functional box (203) is fixedly connected with a storage box (204), the upper end of the storage box (204) is fixedly connected with a blanking pipe (205), the blanking pipe (205) penetrates through the functional box (203) and extends upwards, the functional box (203) is fixedly connected with an air pump (206), the upper end of the functional box (203) is fixedly connected with a detection barrel (207), the detection barrel (207) is communicated with the functional box (203), the inner sliding connection with a floating block (208), the upper end of the floating block (208) is fixedly connected with a magnet (209) and a touch block (210), the inner top of the detection barrel (207) is fixedly connected with a second switch (212), the inner wall of the detection barrel (207) is fixedly connected with three switches (211) and the inner wall of the three switches (211) is fixedly connected with a hose (310) and is far away from one end of the hose (310), a movable structure is arranged on one side of the storage box (204) far away from the rotary lifter (201), a laminating body (309) is arranged on the movable structure, and the functional box (203) is driven to be laminated with the inner wall of the high heat conduction sleeve (1) by using the veneer telescopic rod (202);
During the working process: the air pump (206) is used for injecting air into the functional box (203), when the high heat conduction sleeve (1) at the joint of the functional box (203) is not damaged, the air pressure inside the functional box (203) is enhanced, the floating block (208) is pushed to rise upwards, the air pump (206) is used for continuously injecting air into the functional box (203), the touch block (210) at the upper end of the floating block (208) is contacted with the second switch (212) at the top of the inner cavity of the detecting barrel (207), at the moment, the air pump (206) stops injecting air into the functional box (203), the high heat conduction sleeve (1) is not provided with a notch, the functional box (203) is in a closed state, the air inside the functional box (203) cannot leak, the touch block (210) is continuously contacted with the second switch (212), the high heat conduction sleeve (1) is completely, repairing is not needed, the detection result is fed back to the display, the external lifter is used for adjusting the height of the functional box (203), the rotating lifter (201) is used for adjusting the angle of the functional box (203), the functional box (203) is used for detecting the inner wall of the high heat conduction sleeve (1), when the high heat conduction sleeve (203) is in contact with the second switch (203), the functional box (203) is stopped, the air is in the joint of the functional box (203) is in the contact with the high heat conduction sleeve (203), and the inner part (203) is not provided with the high heat conduction sleeve (212), the inside gas of function box (203) leaks through the breach for atmospheric pressure in function box (203) reduces, thereby make floating block (208) downtake in detection bucket (207), touching piece (210) and second switch (212) separation when floating block (208) downtake, indicate here high heat conduction sleeve pipe (1) has the damage, and drive magnetite (209) and remove together when floating block (208) downtake, produce the electrical reaction when magnetite (209) are close to hall switch (211), make hall switch (211) circular telegram and feed back the circular telegram signal to outside display, after confirming the damage position, through the outside controller who is connected with the display, control outside unloader and irrigate filling material into hose (310), and then under the effect of the built-in extraction pump of hose (310), fill the filling material into the damage and repair, again control laminating body (309) and reciprocate from top to bottom, scrape the filling material of damage through laminating body (309), again with thermal-insulated oil pipe (6) and pump (8) vertical pump (1-1) under the vertical well after accomplishing.
2. A method for producing hot and dry rock by closed loop horizontal well utilization of annular branch according to claim 1, wherein: the heat insulation oil pipe (6) adopts a vacuum heat insulation oil pipe, the heat conductivity coefficient of the heat insulation oil pipe is below 0.04W/(m.K), and the geothermal power generation system (7) adopts a direct power generation mode of double-stage flash evaporation.
3. A method for producing hot and dry rock by closed loop horizontal well utilization of annular branch according to claim 2, wherein: the rotary lifter (201) is fixedly connected with four symmetrically arranged veneering telescopic rods (202), one end, far away from the rotary lifter (201), of each veneering telescopic rod (202) is fixedly connected with a functional box (203), a storage box (204) is fixedly connected in each functional box (203), a blanking pipe (205) is fixedly connected to the upper end of each storage box (204), each blanking pipe (205) penetrates through the adjacent functional boxes (203) and extends upwards, an air pump (206) is fixedly connected to each functional box (203), a detection barrel (207) is fixedly connected to the upper end of each functional box (203), each detection barrel (207) is communicated with an adjacent functional box (203), push plates (213) are connected in a sliding manner in the storage boxes (204), support frames (214) are fixedly connected to the inner sides of the storage boxes (204), two support frames (214) are provided, each support frame (214) is rotatably connected with a rotation-stopping yoke plate (215), one side, close to each other, of each rotation-stopping yoke plate (215) is provided with a positioning block (217), sliding columns (216) are sleeved on the outer sides of the two positioning blocks (217), each sliding column (216) is connected with the adjacent positioning block (217) in a sliding manner, one side of the two sliding columns (216) far away from the veneering telescopic rod (202) is fixedly connected with the pushing plate (213).
4. A method of producing hot and dry rock with closed loop horizontal well by annular branching according to claim 3, wherein: the filling and trimming mechanism comprises a fixed bottom plate (301), a pushing telescopic rod (308), a binding body (309) and a moving structure, wherein the moving structure comprises a driving screw rod (302), a first Z-shaped gear plate (303), a first sliding groove plate (304), a first gear (3051), a first connecting rod (3052), a second connecting rod (3053), a second gear (3054), a second Z-shaped gear plate (306) and a second sliding groove plate (307), one side, far away from the rotary lifter (201), of each storage box (204) is fixedly connected with the fixed bottom plate (301), the upper end of the fixed bottom plate (301) is rotationally connected with the driving screw rod (302), one side, close to the driving screw rod (302), of the storage box (204) is fixedly provided with the first sliding groove plate (304), one side, close to the driving screw rod (302), of the first Z-shaped gear plate (303) is provided with the first Z-shaped gear plate (303), one side, close to the driving screw rod (302), of the first Z-shaped gear plate (303) is provided with the threads, the left side and the right side, close to the first Z-shaped gear plate (303) is provided with the first Z-shaped gear plate (302), the threads (303) are fixedly connected with the driving screw rod (303), the first racks are respectively meshed with the two first gears (3051), one side of the storage box (204) far away from the rotary lifter (201) is provided with a second sliding groove plate (307) in a sliding mode, the second sliding groove plate (306) is fixedly arranged on the left side and the right side of the second sliding groove plate (307) in a sliding mode, the second gears (3054) are respectively and rotatably connected with the left side and the right side of the second sliding groove plate (307), the two first gears (3051) are respectively and fixedly connected with a first connecting rod (3052), the two second gears (3054) are respectively and fixedly connected with a second connecting rod (3053), the two second connecting rods (3053) are respectively and rotatably connected with the first connecting rods (3052), the left side and the right side of the second sliding groove plate (306) are fixedly connected with symmetrically arranged racks, the two racks are respectively meshed with the two second gears (3054), the push telescopic rods (308) are fixedly connected with the second sliding groove plate (307), the two telescopic rods (307) are respectively and fixedly connected with the second connecting rods (3054), the telescopic rods (308) are respectively and fixedly connected with the second sliding groove bodies (309), and the positions of the flexible silicon rubber sheet (309) are fixedly connected with the flexible sheet (309).
5. The method for mining dry and hot rock by using closed loop circulation of annular branch horizontal well according to claim 4, wherein: and an inclined scraping plate is arranged on one side of the attaching body (309) away from the pushing telescopic rod (308).
6. The method for mining dry and hot rock by using closed loop circulation of annular branch horizontal well according to claim 5, wherein: five hoses (310) and five silica gel sheets (311) are fixedly arranged on the attaching body (309), one end, far away from the attaching body (309), of each hose (310) is communicated with the adjacent storage box (204), and the positions of the five silica gel sheets (311) are respectively corresponding to the positions of the five hoses (310).
7. A method of producing hot and dry rock with closed loop horizontal well by annular branching of claim 6, wherein: the upper end of the attaching body (309) is fixedly connected with a flow rate monitor (312), and the flow rate monitor (312) is used for detecting the flow rate of the filling material in the hose (310).
8. A method of producing hot and dry rock with closed loop horizontal well utilization of annular branch of claim 7, wherein: the outer side of the flow velocity monitor (312) is sleeved with a housing (313).
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| CN218991541U (en) * | 2022-11-19 | 2023-05-09 | 盘锦国宇实业有限公司 | Long section sleeve damage well liner pipe patch tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7278480B2 (en) * | 2005-03-31 | 2007-10-09 | Schlumberger Technology Corporation | Apparatus and method for sensing downhole parameters |
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|---|---|---|---|---|
| US6105673A (en) * | 1996-11-05 | 2000-08-22 | Harris; Todd K. | Patching of injection and production well annular casing leaks for restoring mechanical integrity |
| US5957195A (en) * | 1996-11-14 | 1999-09-28 | Weatherford/Lamb, Inc. | Wellbore tool stroke indicator system and tubular patch |
| CN111442565A (en) * | 2018-03-03 | 2020-07-24 | 陈晓辉 | Anti-skid method of leak detection device and leak detection method with same |
| RU2680158C1 (en) * | 2018-04-05 | 2019-02-18 | Федеральное государственное бюджетное учреждение науки Институт проблем нефти и газа Российской академии наук (ИПНГ РАН) | Method of formation geomechanical impact |
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| CN117948727A (en) | 2024-04-30 |
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