CN118088168A - Reservoir transformation method and system for in-situ leaching production well - Google Patents
Reservoir transformation method and system for in-situ leaching production well Download PDFInfo
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- CN118088168A CN118088168A CN202211430659.1A CN202211430659A CN118088168A CN 118088168 A CN118088168 A CN 118088168A CN 202211430659 A CN202211430659 A CN 202211430659A CN 118088168 A CN118088168 A CN 118088168A
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- well flushing
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 81
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 26
- 238000002386 leaching Methods 0.000 title claims abstract description 23
- 238000011426 transformation method Methods 0.000 title description 2
- 238000011010 flushing procedure Methods 0.000 claims abstract description 107
- 239000007788 liquid Substances 0.000 claims abstract description 43
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 27
- 239000011707 mineral Substances 0.000 claims abstract description 27
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 19
- 239000007921 spray Substances 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 13
- 238000005406 washing Methods 0.000 claims description 13
- 238000009420 retrofitting Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 5
- 238000004146 energy storage Methods 0.000 abstract description 7
- 230000035699 permeability Effects 0.000 abstract description 6
- 230000035515 penetration Effects 0.000 abstract 1
- 238000002407 reforming Methods 0.000 description 20
- 230000002787 reinforcement Effects 0.000 description 18
- 238000010276 construction Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 229910052770 Uranium Inorganic materials 0.000 description 4
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 229920001875 Ebonite Polymers 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a method for modifying an in-situ leaching production well reservoir, which is used for reinforcing a production well sleeve at a reservoir to be modified, injecting a mineral layer modifying liquid into the reservoir to be modified to improve the energy storage permeability and achieving the purposes of increasing yield and improving efficiency. The invention also provides an on-site immersed production well reservoir reconstruction system, which comprises a sleeve unit and a tubular column unit, wherein the reinforced sleeve and the reservoir to be reconstructed are processed by utilizing a processing nozzle, then the annulus between the tubular column unit and the reinforced sleeve is blocked by utilizing an upper packer and a lower packer, a well flushing valve ball is put into the well flushing valve ball, mineral layer reconstruction liquid is conveyed into a mounting cavity by the upper packer, a communication channel is blocked by the well flushing valve ball, a shear nail is cut off, a well flushing valve seat slides downwards in the mounting cavity, a well flushing hole is opened, mineral layer reconstruction liquid enters a cavity between the tubular column unit and the reinforced sleeve from the well flushing hole, and then mineral layer reconstruction liquid is injected into the reservoir to be reconstructed by utilizing a seam or a hole processed by the reinforced sleeve, so that the energy storage penetration capacity is improved, and the purpose of increasing yield and improving efficiency is achieved.
Description
Technical Field
The invention relates to the technical field of in-situ leaching uranium extraction, in particular to a method and a system for modifying an in-situ leaching production well reservoir.
Background
The in-situ leaching uranium mining method is a novel uranium mining method which is integrated with mining and smelting and does not cause the ore to generate displacement by selectively dissolving uranium in the ore through the chemical reaction of a leaching agent and the mineral under the natural burying condition. Along with the running of the production well, the pollution of the ore bed or the blockage of the near-wellbore zone is generated, the liquid amount of each layer of the ore bed is different, and the liquid extraction amount is seriously influenced. In the prior art, the shell is used for perforation, fracturing and reconstruction of the ore deposit, the shell is easy to damage the sleeve, the subsequent exploitation work is influenced, the degree of fracturing and reconstruction of the ore deposit is uneven, and the subsequent efficient exploitation is not facilitated.
Therefore, how to change the current situation that the subsequent exploitation work is influenced by the modification of the reservoir by the perforation and fracturing of the shell in the operation process of the in-situ leaching production well in the prior art becomes a problem to be solved urgently by the person skilled in the art.
Disclosure of Invention
The invention aims to provide a method and a system for reforming a reservoir of an in-situ leaching production well, which are used for solving the problems in the prior art and improving the safety and the reliability of reservoir reforming construction so as to achieve the purposes of increasing yield and improving efficiency.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a reservoir reconstruction method for an in-situ leaching production well, which comprises the following steps:
step one, reinforcing a production well casing at a reservoir to be reformed;
step two, processing the reinforced production well casing and the reservoir to be reformed, which is close to the reinforced production well casing, to obtain a liquid injection port;
and step three, plugging the top and the bottom of the reinforced production well casing, and injecting the mineral layer reconstruction liquid into the reservoir to be reconstructed through the liquid injection port.
Preferably, in the first step, steel pipes are used as casings to achieve the reinforcement of the production well casing.
The invention also provides an in situ leaching production well reservoir reconstruction system, comprising:
the casing unit comprises a production well casing, the production well casing comprises a reinforcing casing, and the reinforcing casing is arranged at a reservoir to be rebuilt;
The pipe column unit can extend into the reinforced casing, the pipe column unit comprises an upper packer, a well flushing assembly, a lower packer and a plugging assembly which are sequentially connected, the well flushing assembly is communicated with an external mineral seam reconstruction liquid by utilizing the upper packer, and the upper packer and the lower packer can both plug an annulus between the pipe column unit and the reinforced casing; the well flushing assembly comprises a well flushing spray gun, a well flushing valve seat and a well flushing valve ball, one end of the well flushing spray gun is connected with the upper packer, the other end of the well flushing spray gun is connected with the lower packer, the well flushing spray gun is provided with a mounting cavity and a nozzle cavity, the mounting cavity is communicated with the nozzle cavity, the well flushing valve seat is slidably arranged in the mounting cavity, the mounting cavity is provided with a well flushing hole, the well flushing hole is communicated with the cavity between the pipe column unit and the reinforcing sleeve, and in an initial state, a shear pin is arranged between the well flushing valve seat and the well flushing spray gun, and the well flushing valve seat seals the well flushing hole; the well flushing valve seat is provided with a communication channel, the installation cavity is communicated with an external mineral seam reconstruction liquid by utilizing the communication channel, the well flushing valve ball can block the communication channel, the nozzle cavity is provided with a nozzle hole, the nozzle hole is communicated with the cavity between the tubular column unit and the reinforcing sleeve, and the nozzle hole can be connected with a processing nozzle; the plugging assembly is connected with the lower packer, and can plug the lower packer.
Preferably, a sealing assembly is arranged between the well flushing valve seat and the installation cavity, the sealing assembly comprises a plurality of sealing elements, the sealing elements are arranged along the axial direction of the well flushing valve seat and sleeved outside the well flushing valve seat, and the sealing elements are propped against the side wall of the installation cavity.
Preferably, the number of the well washing holes and the number of the nozzle holes are all multiple, the well washing holes are uniformly distributed circumferentially around the axis of the installation cavity, and the nozzle holes are uniformly distributed circumferentially around the axis of the nozzle cavity.
Preferably, the well-flushing assembly further comprises a pull-out rod detachably connected with the well-flushing valve seat, and a fishing ring is arranged at one end of the pull-out rod away from the well-flushing valve seat.
Preferably, the plugging assembly comprises a check valve connector, a check valve seat, an elastic piece and a check valve core, wherein the check valve connector is detachably connected with the lower packer and is communicated with the lower packer, the check valve seat is in threaded connection with the check valve connector, the check valve seat is provided with a through hole, the check valve core is arranged in a cavity surrounded by the check valve connector and the check valve seat, the elastic piece is arranged between the check valve connector and the check valve core, and under the action of the elastic piece, the check valve core is plugged with the through hole.
Preferably, the one-way valve core is in surface contact with the through hole.
Preferably, the upper packer and the lower packer are slip type packers, and the upper packer and the lower packer are detachably connected with the well flushing assembly by means of a crossover sub respectively.
Preferably, the reinforcement sleeve is made of steel pipe.
Compared with the prior art, the invention has the following technical effects: according to the method for reforming the reservoir of the in-situ immersed production well, firstly, the production well casing at the reservoir to be reformed is reinforced, then the reinforced production well casing and the reservoir to be reformed, which is close to the reinforced production well casing, are processed to obtain the liquid injection port, the top and the bottom of the reinforced production well casing are plugged, and the liquid injection port is used for injecting the mineral layer reforming liquid into the reservoir to be reformed. According to the invention, the energy storage permeability is improved by reinforcing the production well casing at the position of the reservoir to be reformed and injecting the reservoir reforming liquid into the reservoir to be reformed, so that the purposes of increasing production and improving efficiency are achieved, the problem that the perforation, fracturing and reforming of the shell in the prior art affect the exploitation of the subsequent production well is effectively avoided, and the reliability of reservoir reforming is improved.
Meanwhile, the invention also provides an on-site immersed production well reservoir transformation system which comprises a sleeve unit and a tubular column unit, wherein the sleeve unit is provided with a reinforcement sleeve at a reservoir to be transformed, the structural strength of the production well sleeve is reinforced by the reinforcement sleeve, and the tubular column unit can extend into the reinforcement sleeve. The pipe column unit comprises a well flushing assembly, when the pipe column unit is in an initial state, a well flushing valve ball is not put into the well flushing assembly, a packer is plugged by the plugging assembly, a processing nozzle is connected to a nozzle hole, processing media are conveyed into a nozzle cavity, a reinforced casing pipe and a reservoir to be reformed are subjected to slotting or perforating processing by the processing nozzle, then an annulus between the pipe column unit and the reinforced casing pipe is plugged by an upper packer and a lower packer, the plugging of the reinforced casing pipe of the reservoir section to be reformed is realized, the well flushing valve ball is put into the well flushing valve ball, mineral layer reforming liquid is conveyed into a mounting cavity by the upper packer, under the action of liquid pressure, the well flushing valve ball is plugged by a communicating channel, the liquid pressure born by a well flushing valve seat and the well flushing valve ball is continuously increased, a shear pin is cut off by the well flushing valve seat, the well flushing valve seat slides downwards in the mounting cavity, the well flushing hole is opened, mineral layer reforming liquid enters a cavity between the pipe column unit and the reinforced casing pipe through the well flushing hole, and then mineral layer reforming liquid is injected into the reservoir to be reformed by the reinforced casing pipe through the slotting or the hole, and the purpose of increasing energy storage permeability is achieved, and the effect is improved. According to the in-situ leaching production well reservoir reconstruction system, the production well is reinforced by the reinforcement sleeve, the liquid injection port is processed on the reinforcement sleeve by the pipe column unit, and the well flushing assembly is used for injecting the reservoir reconstruction liquid into the reservoir to be reconstructed, so that the reliability of the reservoir reconstruction construction is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the in situ leaching production well reservoir retrofit system of the present invention;
FIG. 2 is an enlarged schematic view of the structure shown at A in FIG. 1;
FIG. 3 is an enlarged schematic view of the structure at B in FIG. 1;
FIG. 4 is a schematic diagram of a portion of the structure of the in situ leaching production well reservoir retrofitting system of the present invention.
The well casing is characterized by comprising a production well casing 1, a reinforcing casing 2, an upper packer 3, a well flushing assembly 4, a lower packer 5, a plugging assembly 6, a well flushing spray gun 7, a well flushing valve seat 8, a well flushing valve ball 9, a mounting cavity 10, a nozzle cavity 11, a well flushing hole 12, a shearing nail 13, a communication channel 14, a nozzle hole 15, a sealing assembly 16, a pull-out rod 17, a one-way valve connector 18, a one-way valve seat 19, an elastic piece 20, a one-way valve core 21, an upper connector 22, an adjusting ring 23, a spacer ring 24, a hard rubber cylinder 25, a compression ring 26, an upper central pipe 27, a cone body 28, a slip body 29, a slip seat 30, a centralizing block 31, a slip ring sleeve 32, a lower central pipe 33, a conversion connector 34 and a soft rubber cylinder 35.
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 aims to provide a method and a system for reforming a reservoir of an in-situ leaching production well, which are used for solving the problems in the prior art and improving the safety and the reliability of reservoir reforming construction so as to achieve the purposes of increasing yield and improving efficiency.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The invention provides a reservoir reconstruction method for an in-situ leaching production well, which comprises the following steps:
step one, reinforcing a production well casing 1 at a reservoir to be rebuilt;
Step two, processing the reinforced production well casing 1 and the reservoir to be reformed, which is close to the reinforced production well casing 1, to obtain a liquid injection port;
and step three, plugging the top and the bottom of the reinforced production well casing 1, and injecting the mineral seam reconstruction liquid into the reservoir to be reconstructed through the liquid injection port.
According to the method for reforming the reservoir of the in-situ immersed production well, firstly, the production well casing 1 at the reservoir to be reformed is reinforced, then the reinforced production well casing 1 and the reservoir to be reformed, which is adjacent to the reinforced production well casing 1, are processed to obtain the liquid injection port, the top and the bottom of the reinforced production well casing 1 are plugged, and the liquid injection port is used for injecting the mineral layer reforming liquid into the reservoir to be reformed. According to the invention, the energy storage permeability is improved by reinforcing the production well casing 1 at the position of the reservoir to be reformed and injecting the reservoir reforming liquid into the reservoir to be reformed, so that the purposes of increasing production and improving efficiency are achieved, the problem that the perforation, fracturing and reforming of shells in the prior art affect the exploitation of subsequent production wells is effectively avoided, and the reliability of reservoir reforming is improved.
In this embodiment, steel pipes are used as the casing to reinforce the production well casing 1 and to improve the structural strength of the production well casing 1. In other embodiments of the invention, other materials of casing may be used to strengthen the production well casing 1.
The invention also provides an on-site immersed production well reservoir transformation system, which comprises a casing unit and a tubular column unit, wherein the casing unit comprises a production well casing 1, the production well casing 1 comprises a reinforcement casing 2, and the reinforcement casing 2 is arranged at a reservoir to be transformed; the pipe column unit can extend into the reinforcement sleeve 2, the pipe column unit comprises an upper packer 3, a well flushing assembly 4, a lower packer 5 and a plugging assembly 6 which are sequentially connected, the well flushing assembly 4 is communicated with an external mineral seam reconstruction liquid by using the upper packer 3, and the upper packer 3 and the lower packer 5 can both plug an annulus between the pipe column unit and the reinforcement sleeve 2; the well flushing assembly 4 comprises a well flushing spray gun 7, a well flushing valve seat 8 and a well flushing valve ball 9, one end of the well flushing spray gun 7 is connected with the upper packer 3, the other end of the well flushing spray gun 7 is connected with the lower packer 5, the well flushing spray gun 7 is provided with a mounting cavity 10 and a nozzle cavity 11, the mounting cavity 10 is communicated with the nozzle cavity 11, the well flushing valve seat 8 is slidably arranged in the mounting cavity 10, the mounting cavity 10 is provided with a well flushing hole 12, the well flushing hole 12 is communicated with a cavity between the pipe column unit and the reinforcing sleeve 2, and in an initial state, a shear pin 13 is arranged between the well flushing valve seat 8 and the well flushing spray gun 7, and the well flushing valve seat 8 seals the well flushing hole 12; the well-flushing valve seat 8 is provided with a communication channel 14, the installation cavity 10 is communicated with an external mineral seam reconstruction liquid by utilizing the communication channel 14, the well-flushing valve ball 9 can block the communication channel 14, the nozzle cavity 11 is provided with a nozzle hole 15, the nozzle hole 15 is communicated with the tubular column unit and the cavity between the reinforcing sleeves 2, and the nozzle hole 15 can be connected with a processing nozzle; the plugging assembly 6 is connected with the lower packer 5, and the plugging assembly 6 can plug the lower packer 5.
According to the in-situ immersed production well reservoir reconstruction system, the casing unit is provided with the reinforcing casing 2 at the reservoir to be reconstructed, the structural strength of the production well casing 1 is reinforced by the reinforcing casing 2, and the tubular column unit can extend into the reinforcing casing 2. The pipe column unit comprises a well flushing assembly 4, a well flushing valve ball 9 is not put into the well flushing assembly in an initial state, a plugging assembly 6 plugs a lower packer 5, a processing nozzle is connected to a nozzle hole 15, a processing medium is conveyed into a nozzle cavity 11, the processing nozzle is used for slotting or perforating the reinforced casing pipe 2 and a reservoir to be reformed, and in actual operation, a hydraulic sand blasting slotting mode can be selected; then, the annular space between the pipe column unit and the reinforcement sleeve 2 is plugged by the upper packer 3 and the lower packer 5, the reinforcement sleeve 2 of the reservoir section to be reformed is plugged, the well flushing valve ball 9 is put into the well flushing valve ball, mineral seam reforming fluid is conveyed into the installation cavity 10 through the upper packer 3, the well flushing valve ball 9 plugs the communication channel 14 under the action of liquid pressure, the liquid pressure born by the well flushing valve seat 8 and the well flushing valve ball 9 is continuously increased, the shear pins 13 are cut off, the well flushing valve seat 8 slides downwards in the installation cavity 10, the well flushing holes 12 are opened, the mineral seam reforming fluid enters the cavity between the pipe column unit and the reinforcement sleeve 2 through the well flushing holes 12, and then the mineral seam reforming fluid is injected into the reservoir to be reformed through the seam or the hole processed by the reinforcement sleeve 2, so that the energy storage permeability is improved, and the purposes of increasing yield and efficiency are achieved. According to the in-situ leaching production well reservoir reconstruction system, the production well is reinforced by the reinforcement sleeve 2, the liquid injection port is processed on the reinforcement sleeve 2 by the pipe column unit, and the well flushing assembly 4 is used for injecting the mineral seam reconstruction liquid into the reservoir to be reconstructed, so that the reliability of the mineral seam reconstruction construction is effectively improved. It should also be explained here that the working pressure requirement can be met by means of a pump skid when the reinforcement sleeve 2 is processed and the mineral seam reconstruction fluid is injected.
In order to avoid leakage, a sealing assembly 16 is arranged between the well-flushing valve seat 8 and the installation cavity 10, the sealing assembly 16 comprises a plurality of sealing elements, the sealing elements are distributed along the axial direction of the well-flushing valve seat 8 and sleeved outside the well-flushing valve seat 8, the sealing elements are abutted against the side wall of the installation cavity 10, the sealing assembly 16 adopts a multiple sealing mode, and the working reliability of the sealing assembly 16 is further improved.
In this embodiment, the number of the well holes 12 and the nozzle holes 15 is plural, the well holes 12 can be circumferentially and uniformly distributed around the axis of the installation cavity 10, and similarly, the nozzle holes 15 can be circumferentially and uniformly distributed around the axis of the nozzle cavity 11, so as to improve the stress uniformity and the working stability of the well washing assembly 4.
Specifically, the well washing assembly 4 further comprises a pull-out rod 17, the pull-out rod 17 can drive the pipe column unit to move, the pull-out rod 17 is detachably connected with the well washing valve seat 8, the well washing valve seat 8 is convenient to assemble and disassemble, a salvage ring is arranged at one end, away from the well washing valve seat 8, of the pull-out rod 17, the salvage is convenient, and the reliability of the pipe column unit is improved.
More specifically, the plugging assembly 6 includes a check valve joint 18, a check valve seat 19, an elastic member 20 and a check valve core 21, the check valve joint 18 is detachably connected with the lower packer 5 and is communicated with the lower packer 5, the check valve seat 19 is in threaded connection with the check valve joint 18, the check valve seat 19 is provided with a through hole, the check valve core 21 is arranged in a cavity enclosed by the check valve joint 18 and the check valve seat 19, the elastic member 20 is arranged between the check valve joint 18 and the check valve core 21, the check valve core 21 plugs the through hole under the action of the elastic member 20, and the elastic member 20 can select a spring. The plugging assembly 6 utilizes the one-way valve core 21 to plug the through hole of the one-way valve seat 19, thereby playing a role in plugging the lower packer 5, and effectively ensuring the tightness of the system in the working process of processing the nozzle.
It should be emphasized that the unidirectional valve core 21 is in surface contact with the through hole, and the surface contact can further improve the working reliability of the plugging assembly 6.
In the specific embodiment, the upper packer 3 and the lower packer 5 are slip type packers, the upper packer 3 comprises an upper joint 22, the upper end of the upper joint 22 can be connected with an element for lowering a tubular column unit into the reinforced sleeve 2, a central tube 27 on the lower end of the upper joint 22 is connected, an anti-rotation nail groove is designed on the upper joint, the upper joint is matched with an adjusting ring 23 for use, the adjusting ring 23 is connected with the upper joint 22 through common threads, and an anti-rotation hole is designed on the adjusting ring and is connected with the upper joint 22 through an anti-rotation pin; the adjusting ring 23, the spacing ring 24 and the compression ring 26 are all designed with shoulder presses, the adjusting ring 23 can be adjusted slightly according to the installation size of the rubber cylinder, and the rubber cylinder can be protected by the shoulder presses. The upper central tube 27 is connected with the upper joint 22 by adopting an oil pipe buckle, and the pressing ring 26, the hard rubber cylinder 25, the spacer ring 24, the soft rubber cylinder 35 and the adjusting ring 23 are sleeved into the upper central tube 27 in sequence, and the pressing ring 26 is provided with an anti-rotation hole and is fixed through an anti-rotation pin. The cone 28 is sleeved into the lower central tube 33 and is connected with the compression ring 26 by adopting common threads, and an anti-rotation hole is formed in the cone and is fixed through an anti-rotation pin. The slips 29 are sleeved into slip seats 30 and are assembled by springs. Three groups of spring mounting holes are designed on the centralizing block 31, are mounted through the spring groups and are limited by means of the slip seat 30 and the slip ring sleeve 32. The slip ring sleeve 32 is connected with the slip seat 30 through common threads, is provided with an anti-rotation hole and is fixed through pins. The slip ring is inserted into the slip ring sleeve 32 and is limited on the lower central tube 33 by a slip ring pin. The upper end of the lower central tube 33 is connected with the upper central tube 27 by adopting an oil pipe buckle, the lower end of the lower central tube 33 is connected with the adapter 34 by adopting an oil pipe buckle, and a sliding ring pin movement track groove is designed on the lower central tube 33, so that the switching between a long rail and a short rail is realized. Slip-type packers are a familiar means to those skilled in the art and will not be described in detail herein. The upper packer 3 and the lower packer 5 have the same structure, and when the ore layer reconstruction liquid is injected, the cone 28 stretches the slips 29, so that the slips 29 are clamped on the side wall of the reinforced casing 2, and the plugging between the tubular column unit and the casing unit is realized. In addition, the upper packer 3 and the lower packer 5 are detachably connected with the well flushing assembly 4 by the adapter 34 respectively, and a threaded connection mode can be adopted, so that convenience in disassembly, assembly and maintenance is improved. The upper and lower base pipes 27, 33 are in communication and external layer-modifying fluid is introduced into the well-flushing assembly 4 via the upper sub 22, upper base pipe 27, lower base pipe 33 and crossover sub 34.
Further, the reinforcing sleeve 2 is made of steel pipes, and the structural strength of the production well sleeve 1 can be greatly improved, so that the safety of reservoir reconstruction construction is improved. In practical application, in order to save production cost, the reinforced casing 2 made of steel pipes can be arranged at the position of the reservoir to be modified, and the casing made of common PVC material can be used as the casing 1 of the production well at other parts of the production well.
When the in-situ leaching production well reservoir reconstruction system is used for in-situ leaching production well reservoir reconstruction, the production well casing 1 is reinforced, the well washing assembly 4 is used for processing the reinforced casing 2 to obtain a liquid injection port, the upper and lower interfaces of a well section of a mineral layer to be reconstructed are sealed by the upper packer 3 and the lower packer 5 to form a sealed cavity, and mineral layer reconstruction liquid is injected into the reservoir in a large discharge amount, so that the energy storage permeability is improved, and the purposes of increasing yield and improving efficiency are achieved. The pipe column unit has the advantages of simple structure, novel structure and high working reliability, and meets the field construction requirement.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. A method for modifying a reservoir of an in-situ leaching production well, comprising the steps of:
step one, reinforcing a production well casing at a reservoir to be reformed;
step two, processing the reinforced production well casing and the reservoir to be reformed, which is close to the reinforced production well casing, to obtain a liquid injection port;
and step three, plugging the top and the bottom of the reinforced production well casing, and injecting the mineral layer reconstruction liquid into the reservoir to be reconstructed through the liquid injection port.
2. The method of in situ leaching production well reservoir retrofitting according to claim 1 and wherein: in the first step, steel pipes are used as casings to strengthen the production well casings.
3. An in situ dip production well reservoir retrofit system, comprising:
the casing unit comprises a production well casing, the production well casing comprises a reinforcing casing, and the reinforcing casing is arranged at a reservoir to be rebuilt;
The pipe column unit can extend into the reinforced casing, the pipe column unit comprises an upper packer, a well flushing assembly, a lower packer and a plugging assembly which are sequentially connected, the well flushing assembly is communicated with an external mineral seam reconstruction liquid by utilizing the upper packer, and the upper packer and the lower packer can both plug an annulus between the pipe column unit and the reinforced casing; the well flushing assembly comprises a well flushing spray gun, a well flushing valve seat and a well flushing valve ball, one end of the well flushing spray gun is connected with the upper packer, the other end of the well flushing spray gun is connected with the lower packer, the well flushing spray gun is provided with a mounting cavity and a nozzle cavity, the mounting cavity is communicated with the nozzle cavity, the well flushing valve seat is slidably arranged in the mounting cavity, the mounting cavity is provided with a well flushing hole, the well flushing hole is communicated with the cavity between the pipe column unit and the reinforcing sleeve, and in an initial state, a shear pin is arranged between the well flushing valve seat and the well flushing spray gun, and the well flushing valve seat seals the well flushing hole; the well flushing valve seat is provided with a communication channel, the installation cavity is communicated with an external mineral seam reconstruction liquid by utilizing the communication channel, the well flushing valve ball can block the communication channel, the nozzle cavity is provided with a nozzle hole, the nozzle hole is communicated with the cavity between the tubular column unit and the reinforcing sleeve, and the nozzle hole can be connected with a processing nozzle; the plugging assembly is connected with the lower packer, and can plug the lower packer.
4. A dip production well reservoir retrofitting system according to claim 3 and wherein: the well flushing valve seat is characterized in that a sealing assembly is arranged between the well flushing valve seat and the mounting cavity, the sealing assembly comprises a plurality of sealing elements, the sealing elements are distributed along the axial direction of the well flushing valve seat and sleeved outside the well flushing valve seat, and the sealing elements are propped against the side wall of the mounting cavity.
5. A dip production well reservoir retrofitting system according to claim 3 and wherein: the number of the well washing holes and the number of the nozzle holes are multiple, the well washing holes are circumferentially and uniformly distributed around the axis of the installation cavity, and the nozzle holes are circumferentially and uniformly distributed around the axis of the nozzle cavity.
6. A dip production well reservoir retrofitting system according to claim 3 and wherein: the well washing assembly further comprises a pulling rod, the pulling rod is detachably connected with the well washing valve seat, and one end, away from the well washing valve seat, of the pulling rod is provided with a fishing ring.
7. A dip production well reservoir retrofitting system according to claim 3 and wherein: the plugging assembly comprises a one-way valve connector, a one-way valve seat, an elastic piece and a one-way valve core, wherein the one-way valve connector is detachably connected with the lower packer and is communicated with the lower packer, the one-way valve seat is in threaded connection with the one-way valve connector, the one-way valve seat is provided with a through hole, the one-way valve core is arranged in a cavity enclosed by the one-way valve connector and the one-way valve seat, the elastic piece is arranged between the one-way valve connector and the one-way valve core, and under the action of the elastic piece, the one-way valve core is plugged with the through hole.
8. The in situ leaching production well reservoir retrofitting system of claim 7 wherein: the one-way valve core is in surface contact with the through hole.
9. A dip production well reservoir retrofitting system according to claim 3 and wherein: the upper packer and the lower packer are slip type packers, and the upper packer and the lower packer are detachably connected with the well flushing assembly through a crossover sub respectively.
10. An in situ leaching production well reservoir retrofitting system according to any of claims 3-9 and wherein: the reinforcing sleeve is made of steel pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211430659.1A CN118088168A (en) | 2022-11-15 | 2022-11-15 | Reservoir transformation method and system for in-situ leaching production well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211430659.1A CN118088168A (en) | 2022-11-15 | 2022-11-15 | Reservoir transformation method and system for in-situ leaching production well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118088168A true CN118088168A (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211430659.1A Pending CN118088168A (en) | 2022-11-15 | 2022-11-15 | Reservoir transformation method and system for in-situ leaching production well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118088168A (en) |
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2022
- 2022-11-15 CN CN202211430659.1A patent/CN118088168A/en active Pending
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