CN210239638U - Pressurized hole sealing device for coal mine nearly horizontal fracturing drilling - Google Patents
Pressurized hole sealing device for coal mine nearly horizontal fracturing drilling Download PDFInfo
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- CN210239638U CN210239638U CN201921229830.6U CN201921229830U CN210239638U CN 210239638 U CN210239638 U CN 210239638U CN 201921229830 U CN201921229830 U CN 201921229830U CN 210239638 U CN210239638 U CN 210239638U
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Abstract
The utility model discloses a hole sealing device under pressure for near horizontal fracturing drilling of a coal mine, which comprises an extraction pipe, a grouting pipe and a slurry return pipe; an extraction screen pipe is formed at the front end of the extraction pipe, and an air return and water filter structure is formed on a pipe section of the extraction pipe, which is positioned between the orifice hole sealing bag and the hole bottom sealing bag; the grouting pipe consists of a first grouting pipe and a second grouting pipe, and the first grouting pipe extends into the hole bottom sealing bag after penetrating through the hole opening sealing bag; the second grouting pipe is connected out of the hole bottom sealing bag and faces the hole opening sealing bag, and a blasting pressure limiting valve is arranged on the second grouting pipe; the slurry return pipe penetrates through the hole opening sealing bag, and a pressure release valve or a back pressure type safety valve is arranged on a pipe section of the slurry return pipe, which is positioned outside the hole opening of the drill hole. The utility model has the advantages of simple structure and convenient operation; the hole sealing section formed by sealing the hole by using the hole sealing device has a compact structure and a good hole sealing effect, and is particularly suitable for the situation that the middle hole sealing section is longer.
Description
Technical Field
The utility model discloses a belong to coal bed gas field of developing, in particular to colliery is nearly horizontal hydraulic fracturing drilling's in pit area pressure slip casting hole sealing device.
Background
In the field of coal mines, hydraulic permeability increasing measures represented by hydraulic fracturing are widely applied to permeability increasing of coal seams so as to improve the air permeability of the coal seams to realize high-efficiency extraction. For the hole sealing problem, methods such as 'two-plugging one-injecting' and the like are generally adopted on a coal mine site. Chinese patent documents CN201710845047.1 disclose a grouting hole sealing device, CN103615212A a two-plug one-grouting hole sealing device and CN208122818U a segmented pressure-limiting grouting hole sealing device. The main technical defects of the traditional two-plugging one-injection and low-pressure secondary grouting fracturing drilling and sealing mode adopted by the main stream of a mine are two aspects: the hole sealing material is ordinary cement, has contractibility, needs to increase a secondary grouting hole sealing process, is complex in technology and has poor tightness with a drilling wall; and secondly, low-pressure grouting is adopted, and the hole sealing slurry is not carried out under pressure, so that effective permeation of deeper cracks of the hole wall cannot be realized, and the pressure bearing capacity of a hole sealing section and the later extraction effect as an extraction hole during application are influenced. Although the conventional coal seam drilling hole pressurized grouting hole sealing technology is mature day by day, the existing hole sealing device and hole sealing process cannot be completely adopted in view of the particularity of underground near-horizontal hydraulic fracturing drilling holes, and the main reason is that the length (30-50 m) of the sealing length of a fracturing drilling hole is further prolonged compared with the length (8-20 m) of the sealing length of an ordinary coal seam extraction drilling hole, so that the following adverse effects are brought: the conventional coal seam drilling under-pressure grouting hole sealing pressure is small, the pressure of a deep hole sealing section cannot reach the design pressure, and the permeability of the conventional coal seam drilling under-pressure grouting hole sealing section to a coal wall crack is poor after the distance is lengthened; after the hole sealing length is increased, water and air are filtered only by the bag bags of the two end seats, the efficiency is low, the effect is poor, the limit air chamber phenomenon is easy to occur in the middle hole sealing section, the hole sealing effect is poor, and the air leakage probability is increased.
Along with the expansion of a fracturing scope, hydraulic fracturing fracture initiation pressure is also increasing correspondingly, hole sealing quality and hole sealing efficiency requirement to fracturing drilling hole sealing section are also higher, and "two are annotated, low pressure, secondary slip casting hole sealing mode that present mine mainstream adopted, the hole sealing process is loaded down with trivial details, the crack shutoff effect is relatively poor, need to develop a pressure slip casting hole sealing device urgently, through the one-time pressure slip casting accomplish two order slip casting modes of annotating, eliminate the limit air chamber, improve the crack shutoff effect.
Disclosure of Invention
The utility model aims to provide a pressurized grouting hole sealing device suitable for underground coal mine nearly horizontal hydraulic fracturing drilling aiming at the defects of complicated hole sealing procedures and poor fracture sealing effect in the prior art, which is characterized in that an air return water filtering structure is arranged on a pipe section of a middle hole sealing section through an extraction pipe so as to discharge gas and moisture through the air return water filtering structure in the process of forming two plugs; and an intermediate grouting plugging section is formed in the continuous pressurized grouting process after the two plugs are formed, the air return water filtering structure is used again to discharge air and moisture, a limit air chamber is prevented from being formed in the grouting plugging section, the intermediate plugging section is guaranteed to be compact in structure, and the fracture plugging effect is improved. The hole sealing device is simple in structure and convenient in hole sealing operation.
In order to achieve the above purpose, the present invention adopts the following technical solution.
A hole sealing device under pressure for a coal mine nearly horizontal fracturing drill hole comprises an extraction pipe, a grouting pipe and a slurry return pipe; an extraction sieve tube is formed at the front end of the extraction pipe, and an orifice sealing bag and a hole bottom sealing bag are arranged in the middle of the extraction pipe; when a drill hole is sealed, hole sealing slurry is poured through a grouting pipe, an orifice seat sealing section and a hole bottom seat sealing section are respectively formed in an orifice hole sealing bag section and a hole bottom sealing bag section of the drill hole, and a middle hole sealing section is formed between the orifice seat sealing section and the hole bottom seat sealing section; a gas return water filtering structure is formed on a pipe section of the extraction pipe corresponding to the middle hole sealing section, and comprises a plurality of gas return sieve pores arranged on the extraction pipe and a water filtering layer wrapped outside the gas return sieve pores; the grouting pipe consists of a first grouting pipe and a second grouting pipe, the first grouting pipe penetrates through the orifice hole sealing bag and then extends into the hole bottom sealing bag, and the far-end pipe orifice of the first grouting pipe is blocked by a plug; the first grouting pipe is provided with a first grouting hole and a second grouting hole on the corresponding pipe sections of the orifice sealing bag and the hole bottom sealing bag respectively; the second grouting pipe is connected out of the hole bottom sealing bag and extends towards the orifice sealing bag, the free end outlet of the second grouting pipe is positioned between the orifice sealing bag and the hole bottom sealing bag, and the second grouting pipe is provided with a blasting pressure limiting valve; the slurry return pipe penetrates through the orifice hole sealing bag, the inlet end of the slurry return pipe is positioned between the orifice hole sealing bag and the hole bottom sealing bag, the outlet end of the slurry return pipe is positioned outside the hole to be sealed, and a pressure release valve or a backpressure type safety valve is arranged on a pipe section of the slurry return pipe positioned outside the orifice of the drilled hole.
Adopt the aforesaid scheme the utility model discloses, through form on the pipeline section between drill way hole sealing bag and hole bottom hole sealing bag by taking out a plurality of return air sieve meshes on the extraction pipe and wrap up the return air drainage structure that the drainage layer formed outside the return air sieve mesh, in order to grout the in-process that forms the seat seal to drill way hole sealing bag and hole bottom hole sealing bag, and the slip casting in-process of middle hole sealing section, middle hole sealing section space reduces gradually, atmospheric pressure increases gradually, gas and the precipitation water in the middle hole sealing section flow back to taking out the extraction pipe through the return air sieve mesh, thereby effectively avoid appearing closed air chamber in the middle hole sealing section, also known as limit air chamber phenomenon; or reducing the probability of the occurrence of a limiting air chamber; thereby improving the compactness of internal tissues after slurry is poured, reducing the shrinkage rate and improving the fracture plugging effect; meanwhile, through arranging a first grouting pipe for communicating the two bags, a second grouting pipe for communicating the bag at the bottom of the hole and the middle hole sealing section and a blasting pressure limiting valve, simultaneous grouting of the two seat sealing sections, sequential grouting of the seat sealing section and the middle hole sealing section and pressurized grouting of the middle hole sealing section can be implemented; through setting up the thick liquid pipe and pressure relief valve or the backpressure type relief valve that return that form the space intercommunication with middle hole sealing section, can effectively ensure that the slip casting pressure of middle hole sealing section is restricted at the settlement within range, ensure slip casting safety, and can not form the excessive extrusion to the seat, ensure that the seat seals reliably. The structure is simple, and the hole sealing operation is convenient; is particularly suitable for the situation that the length value of the middle hole sealing section is large. The pressure limiting valve for blasting has the functions that when the pressure inside the corresponding pipeline or container reaches a set value, the valve is burst, the pipeline is disconnected, and the material flows out from the blasting opening. A relief valve or back pressure type safety valve is provided in which the valve is opened when the pressure inside the corresponding pipe or vessel reaches a set value, and is closed again when the pressure inside the pipe is lower than or equal to the set value during the relief process, so that the pressure inside the pipe or vessel is maintained at the set value. When the diameter and the number of the return air sieve holes in the extraction pipe are determined, the following factors are integrated for determination: the volume of the middle sealing section, the grouting pipe diameter, the working condition flow of a grouting pump, the flow loss coefficient in the grouting process and the filtering characteristic of the water filtering layer.
Preferably, the slurry return pipe is provided with a slurry return exhaust bypass through a tee joint, the bypass is provided with a slurry return exhaust control valve, and the inlet end of the slurry return pipe is provided with a filter screen. The formation probability of a limit air chamber is further reduced, and the plugging effect of the whole hole sealing section is improved.
Further preferably, an outlet end of the slurry return exhaust bypass is connected with an air pump. So as to further avoid or eliminate the phenomenon of a limit air chamber and further improve the plugging effect.
Preferably, the first grouting pipe is provided with a one-way valve, and the one-way valve is positioned in the orifice sealing bag. After grouting is stopped, the pressure in the two bags is not reduced, the hole sealing effect is improved, the one-way valve is arranged in the bags, the bags cannot be damaged in the expansion process of the bags, and the seat sealing effect of the bags is ensured.
Preferably, the water filtering layer is made of a single-layer cotton bag material into a cylinder shape and is fixedly connected with the extraction pipe through pipe clamps arranged at two ends. The air-return water filtering purpose of the middle hole sealing section is realized by fully utilizing the air-permeable water filtering characteristic of the cotton bag material, so that the air-return water filtering structure is simplified, and the manufacturing cost is reduced. In the scheme of arranging the pulp returning and exhausting bypass, the filter screen can also be made of a single-layer cotton bag material.
Preferably, the orifice sealing bag and the hole bottom sealing bag are both made of cotton bag materials and have an inner-layer and outer-layer double-layer bag structure, and are fixedly connected with the extraction pipe through pipe clamps arranged at two ends. The air-permeable and water-filtering purpose of the hole-sealing bag is realized by fully utilizing the air-permeable and water-filtering characteristics of the cotton bag material, so that the air-return and water-filtering structure is simplified, and the manufacturing cost is reduced.
The utility model has the advantages of simple structure and convenient operation; the hole sealing section formed by the hole sealing device is compact in structure, low in shrinkage rate and good in sealing effect, is suitable for various hydraulic fracturing drill holes in the underground coal mine, and particularly has a nearly horizontal drilling angle and a longer drilling sealing effect of the middle hole sealing section.
Drawings
Fig. 1 is a schematic structural diagram of the device of the present invention.
Fig. 2 is a schematic view of the structure of the orifice portion of the device of the present invention.
Fig. 3 is a schematic structural view of a middle hole sealing section of the device of the present invention.
Fig. 4 is a schematic structural view of the bottom of the hole of the device of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, which are not intended to limit the scope of the embodiments described herein.
In embodiment 1, referring to fig. 1, fig. 2, fig. 3, and fig. 4, a pressurized hole sealing device for a near-horizontal fracturing borehole of a coal mine includes an extraction pipe 1, a grouting pipe, and a slurry return pipe 8; an extraction sieve tube 1a is formed at the front end of the extraction tube 1, and an orifice sealing bag 2 and a hole bottom sealing bag 3 are arranged in the middle of the extraction tube 1; when a drill hole is sealed, hole sealing slurry is poured through a grouting pipe, an orifice seat sealing section and a hole bottom seat sealing section are respectively formed on an orifice hole sealing bag 2 and a hole bottom hole sealing bag 3 section of the drill hole, and a middle hole sealing section is formed between the orifice seat sealing section and the hole bottom seat sealing section; a gas return water filtering structure is formed on a pipe section of the extraction pipe 1 corresponding to the middle hole sealing section, and comprises a plurality of gas return sieve holes formed in the extraction pipe 1 and a water filtering layer 12 wrapped outside the gas return sieve holes; the grouting pipe consists of a first grouting pipe 6 and a second grouting pipe 7, the first grouting pipe 6 extends into the hole bottom sealing bag 3 after passing through the hole opening sealing bag 2, and the far-end pipe orifice of the first grouting pipe 6 is blocked by a plug; the first grouting holes 6a and the second grouting holes 6b are respectively arranged on the corresponding pipe sections of the first grouting pipe 6 positioned in the orifice sealing bag 2 and the hole bottom sealing bag 3; the second grouting pipe 7 is connected out of the hole bottom sealing bag 3 and extends towards the orifice sealing bag 2, the free end outlet of the second grouting pipe 7 is positioned between the orifice sealing bag 2 and the hole bottom sealing bag 3, and the second grouting pipe 7 is provided with a blasting pressure limiting valve 4; the slurry return pipe 8 penetrates through the orifice hole sealing bag 2, the inlet end of the slurry return pipe 8 is located between the orifice hole sealing bag 2 and the hole bottom sealing bag 3, the outlet end of the slurry return pipe 8 is located outside the hole to be sealed, a pressure release valve or a backpressure safety valve 5 is arranged on a pipe section of the slurry return pipe 8 located outside the orifice of the drilled hole, and the pressure release valve or the backpressure safety valve 5 is used for pressure maintaining of the whole hole sealing section of the two seat sealing sections and the middle hole sealing section. The first grouting hole 6a and the second grouting hole 6b are formed by at least 3 grouting small holes with the diameter of 10 mm; the slurry return pipe 8 is fixedly connected with the orifice sealing bag 2 through a pipe clamp to form sealing connection.
Wherein, the first grouting pipe 6 is connected with a grouting pump 17, and a grouting control valve 15 is arranged on the connecting pipeline. The first grouting pipe 6 is provided with a one-way valve 10, and the one-way valve 10 is positioned in the orifice sealing bag 2; the one-way valve 10 is used for integral pressure holding of the two bladders 3.
The water filtering layer 12 is made of a single-layer cotton bag material into a cylinder shape and is fixedly connected with the extraction pipe 1 through pipe clamps arranged at two ends. The orifice hole sealing bag 2 and the hole bottom sealing bag 3 are both made of cotton bag materials and have an inner-layer and outer-layer double-layer bag structure, and are fixedly connected with the extraction pipe 1 through pipe clamps arranged at two ends. The first grouting pipe 6 and the second grouting pipe 7 are fixed with the corresponding bags through the corresponding pipe clamps and form sealing connection.
The rest of the structure of this embodiment is the same as embodiment 1, and is not described herein again.
When the device of the embodiment 1 or 2 is used for grouting and sealing the near-horizontal hole under pressure in the underground coal mine, the method comprises the following steps:
s1, installing a hole sealing device: placing an extraction pipe 1 provided with an orifice hole sealing bag 2, a gas return water filtering structure and a hole bottom sealing bag 3 into a hole to be sealed according to an inward mode of a fracturing sieve pipe 1a, and enabling the hole bottom sealing bag 3 to be located in a stratum layer close to the outer side of a target coal bed; connecting the first grouting pipe 6 with a grouting pump 17, and arranging a grouting control valve 15 on a connecting pipeline; and the operating pressure value of the pressure relief valve or the back pressure type safety valve 5 is set;
s2, grouting and hole sealing: adopting a grouting pump 17 with grouting pressure more than 3.0MPa to simultaneously pour the uniformly stirred hole sealing material into the orifice hole sealing bag 2 and the hole bottom sealing bag 3 through a first grouting pipe 6 to form orifice and hole bottom seat seals, and after the blasting pressure limiting valve 4 is blasted, grouting through a second grouting pipe 7 to form a middle hole sealing section; when slurry return occurs in the slurry return pipe 8, the grouting control valve 15 is closed first, and then the grouting pump 17 is stopped to complete grouting.
Wherein, the blasting pressure limiting value of the blasting pressure limiting valve 4 is selected according to 2.0 MPa; the action pressure value of the pressure relief valve or the backpressure type safety valve 5 is set according to 2.5 Mpa. Before the hole sealing device is installed, manufacturing the hole sealing device and cleaning a hole to be sealed; after grouting is finished, equipment cleaning and field arrangement are carried out, and when the diameter and the number of the air return sieve holes in the extraction pipe 1 are determined in the hole sealing device manufacturing process, the following factors are integrated for determination: the volume of the middle sealing section, the grouting pipe diameter, the working condition flow of a grouting pump, the flow loss coefficient in the grouting process and the filtering characteristic of the water filtering layer.
When the device of the embodiment 2 is adopted, auxiliary air exhaust is carried out by the air suction pump 18 during grouting.
Will the utility model discloses the device is specifically applied to Chongqing can throw the new forms of energy loose algae colliery-225 m horizontal fracturing drilling of Yu and carry out the hole sealing test, adopts aforementioned hole sealing technology and ordinary cement mortar hole sealing respectively 5 experimental, and novel hole sealing test drilling is 1 slip casting, all realizes successfully returning the thick liquid, reaches design pressure 2.0MPa, takes out after the fracturing and takes out the single-hole and take out concentration 80% on average; common cement mortar hole sealing adopts 2 times of grouting, and the extraction concentration is 50%; meanwhile, the ground simulation experiment drilling adopts a steel pipe to simulate the drilling and the sealing, and then the internal structure is disassembled, so that the sealing quality is tight and has no crack and air chamber. Adopt the utility model discloses the hole sealing process is obviously simplified, reduces middle part air chamber and produces the probability, and adjusts fracturing pressure among the test process and reach 70MPa drilling hole sealing intact, shows the technical superiority of novel hole sealing technology. Wherein the extraction pipe 1 is a steel pipe with the drift diameter of 50mm and the outer diameter of 56 mm; the hole diameter of the drilled hole is 90mm, the first grouting pipe and the second grouting pipe are respectively made of 4-minute PVC pipes, and the selected pipe clamps and bags are all universal, so that the use requirements of the steel pipe for 50-75mm fracturing can be met; the fixing device is used for fixing the bag and sealing and fixing the grouting pipe, the grout return pipe and the like which extend into and pass through the bag and the bag.
Plugging the port of the first grouting pipe 6, and grouting by adopting at least 3 grouting small holes with the aperture of 10mm, which are arranged in the corresponding bag on the pipe wall; the air return sieve holes 1b of the air return water filtering structure are arranged in double rows, the aperture is 6mm, the axial distance is 20cm, and the total number is 12; the arrangement position of the air return sieve pore 1b is adjusted according to the inclination angle of the drilling hole, and when the upward hole is sealed, the position of the air return sieve pore 1b is close to the hole bottom bag; when the hole is closed, the sealing part is arranged at the position of the middle hole sealing section 3/4, and when the hole is closed downwards, the sealing part is close to the hole bag.
When setting the diameter and number of return air mesh openings 1b in a particular application, the following factors are considered: the air volume of the middle hole sealing section and the grouting amount in unit time; the equivalent diameter of the return air sieve openings 1b with the filter cloth.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (6)
1. A hole sealing device with pressure for a coal mine nearly horizontal fracturing drill hole comprises an extraction pipe (1), a grouting pipe and a slurry return pipe (8); an extraction sieve tube (1a) is formed at the front end of the extraction tube (1), and an orifice sealing bag (2) and a hole bottom sealing bag (3) are arranged in the middle of the extraction tube (1); when a drill hole is sealed, hole sealing slurry is poured through a grouting pipe, an orifice seat sealing section and a hole bottom seat sealing section are respectively formed at an orifice hole sealing bag (2) section and a hole bottom hole sealing bag (3) section of the drill hole, and a middle hole sealing section is formed between the orifice seat sealing section and the hole bottom seat sealing section; the gas return water filtering structure is characterized in that a pipe section of the extraction pipe (1) corresponding to the middle hole sealing section is provided with a gas return water filtering structure, and the gas return water filtering structure comprises a plurality of gas return sieve pores arranged on the extraction pipe (1) and a water filtering layer wrapped outside the gas return sieve pores; the grouting pipe consists of a first grouting pipe (6) and a second grouting pipe (7), the first grouting pipe (6) penetrates through the orifice hole sealing bag (2) and then extends into the hole bottom sealing bag (3), and a far-end pipe orifice of the first grouting pipe (6) is blocked by a plug; the first grouting holes (6a) and the second grouting holes (6b) are respectively formed in the corresponding pipe sections of the first grouting pipe (6) positioned in the orifice sealing bag (2) and the hole bottom sealing bag (3); the second grouting pipe (7) is connected out of the hole bottom sealing bag (3) and extends towards the orifice sealing bag (2), the free end outlet of the second grouting pipe (7) is positioned between the orifice sealing bag (2) and the hole bottom sealing bag (3), and the second grouting pipe (7) is provided with a blasting pressure limiting valve (4); the slurry return pipe (8) penetrates through the orifice hole sealing bag (2), the inlet end of the slurry return pipe (8) is located between the orifice hole sealing bag (2) and the hole bottom sealing bag (3), the outlet end of the slurry return pipe (8) is located outside the hole to be sealed, and a pressure release valve or a backpressure type safety valve (5) is arranged on a pipe section of the slurry return pipe (8) located outside the orifice of the drilled hole.
2. The pressurized hole sealing device for the coal mine near-horizontal fracturing drill hole according to claim 1, characterized in that the slurry return pipe (8) is provided with a slurry return exhaust bypass through a tee joint, a slurry return exhaust control valve (14) is arranged on the bypass, and the inlet end of the slurry return pipe (8) is provided with a filter screen (9).
3. The pressurized hole sealing device for the coal mine near-horizontal fracturing drill hole according to claim 2, wherein an air pump (18) is connected to the outlet end of the slurry return exhaust bypass.
4. The pressurized sealing device for the coal mine near-horizontal fracturing drill hole according to claim 1, characterized in that a one-way valve (10) is arranged on the first grouting pipe (6), and the one-way valve (10) is positioned in the hole sealing bag (2).
5. The pressurized hole sealing device for the near-horizontal fracturing drill hole of the coal mine according to any one of claims 1 to 4, wherein the water filtering layer is made of a single-layer cotton bag material into a cylindrical shape, and is fixedly connected with the extraction pipe (1) through pipe clamps arranged at two ends.
6. The pressurized hole sealing device for the coal mine nearly horizontal fracturing drill hole according to any one of claims 1 to 4, characterized in that the hole opening sealing bag (2) and the hole bottom sealing bag (3) are both made of cotton bag materials into double-layer bag structures with inner layers and outer layers, and are fixedly connected with the extraction pipe (1) through pipe clamps arranged at two ends.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921229830.6U CN210239638U (en) | 2019-07-30 | 2019-07-30 | Pressurized hole sealing device for coal mine nearly horizontal fracturing drilling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921229830.6U CN210239638U (en) | 2019-07-30 | 2019-07-30 | Pressurized hole sealing device for coal mine nearly horizontal fracturing drilling |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110284849A (en) * | 2019-07-30 | 2019-09-27 | 重庆市能源投资集团科技有限责任公司 | A kind of hole sealing device and method for sealing with pressure for the nearly horizontal fractures drilling of coal mine |
| CN111946308A (en) * | 2020-07-29 | 2020-11-17 | 山西晋城无烟煤矿业集团有限责任公司 | Coal reservoir and underlying goaf coalbed methane layered pressure control combined extraction method |
-
2019
- 2019-07-30 CN CN201921229830.6U patent/CN210239638U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110284849A (en) * | 2019-07-30 | 2019-09-27 | 重庆市能源投资集团科技有限责任公司 | A kind of hole sealing device and method for sealing with pressure for the nearly horizontal fractures drilling of coal mine |
| CN111946308A (en) * | 2020-07-29 | 2020-11-17 | 山西晋城无烟煤矿业集团有限责任公司 | Coal reservoir and underlying goaf coalbed methane layered pressure control combined extraction method |
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