CN114542005B - Pressure-injection integrated packer device for hydraulic fracturing of hard thick-roof coal - Google Patents
Pressure-injection integrated packer device for hydraulic fracturing of hard thick-roof coal Download PDFInfo
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- CN114542005B CN114542005B CN202210148531.XA CN202210148531A CN114542005B CN 114542005 B CN114542005 B CN 114542005B CN 202210148531 A CN202210148531 A CN 202210148531A CN 114542005 B CN114542005 B CN 114542005B
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- packer
- connecting pipe
- upper packer
- pipe
- lower packer
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- 239000003245 coal Substances 0.000 title claims abstract description 58
- 238000002347 injection Methods 0.000 title claims abstract description 57
- 239000007924 injection Substances 0.000 title claims abstract description 57
- 238000007789 sealing Methods 0.000 claims abstract description 54
- 239000002775 capsule Substances 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000004891 communication Methods 0.000 claims abstract description 9
- 210000001503 joint Anatomy 0.000 claims abstract description 8
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 230000010354 integration Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000005065 mining Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011084 recovery 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The pressure-injection integrated packer device for hydraulic fracturing of hard thick-roof coal comprises an upper packer, a lower packer and a throttle, wherein the upper packer comprises an upper packer connecting pipe and an upper packer sealing capsule, and an upper packer water injection hole which is enveloped by the upper packer sealing capsule is penetrated through the pipe wall of the upper packer connecting pipe; the lower packer comprises a packer connecting pipe and a lower packer sealing capsule; one end of the restrictor is in butt joint communication with the upper packer connecting pipe, the other end of the restrictor is in butt joint communication with the lower packer connecting pipe, a pipe orifice at one end of the upper packer connecting pipe far away from the restrictor is connected with a one-way valve, a pipe orifice at one end of the lower packer connecting pipe far away from the restrictor is connected with a lower packer lower seal head, and a jet hole penetrating into the lower packer connecting pipe is formed in the side wall of the lower packer lower seal head. The invention has reasonable and compact structure and convenient use, reduces the working procedures of underground operation, improves the coal discharging operation efficiency, and reduces the workload of workers.
Description
Technical Field
The invention relates to the field of coal mining equipment, in particular to a pressure-injection integrated packer device for hydraulic fracturing of hard thick-roof coal.
Background
In the production process of the coal mine, as the mining depth is gradually increased, the ground stress is obviously increased, and the top coal at the upper part of the mining coal bed is more compact and hard compared with the shallow coal bed, so that the difficulty that the top coal is difficult to collapse due to the mine pressure and falls into a coal discharge port is caused. At present, the hydraulic fracturing technology is mainly adopted to crush the top coal, and then the top coal collapses and falls into a coal discharge port under the action of mine pressure, so that the recovery rate of the coal is improved, and the yield of the coal mine is increased.
For hard thick-roof coal, only a few cracks are generated in the hard thick-roof coal, the requirement that the hard thick-roof coal collapses and falls into a coal outlet can not be met, and the hard thick-roof coal is mainly characterized in that the roof coal is hard and cannot be broken even if layering is carried out. The current method for solving the problem mainly relies on secondary jet fracturing, and the layered hard thick-top coal is cut by adopting a water jet mode. However, the secondary fracturing not only requires a large amount of material resources and manpower, but also wastes a large amount of time. Therefore, the existing hydraulic fracturing device needs to be optimized and improved so that primary fracturing can be realized and secondary fracturing effect can be realized.
Disclosure of Invention
Based on the method, the invention provides the pressure-injection integrated packer device for hydraulic fracturing of the hard thick roof coal, and the hard thick roof coal can be effectively fractured by the synchronous action of fracturing medium fracturing and fracturing medium jet flow so as to meet the requirement that the hard thick roof coal after fracturing falls into a coal discharge port.
In order to achieve the above purpose, the invention provides a pressure-injection integrated packer device for hydraulic fracturing of hard and thick roof coal, which comprises an upper packer, a lower packer and a restrictor, wherein:
the upper packer comprises a hollow cylindrical upper packer connecting pipe and an upper packer sealing capsule sleeved on the peripheral pipe wall of the upper packer connecting pipe, an upper packer water injection hole sleeved by the upper packer sealing capsule is penetrated through the pipe wall of the upper packer connecting pipe, and the upper packer water injection hole is used for injecting fracturing medium in the upper packer connecting pipe into the upper packer sealing capsule so as to expand the upper packer sealing capsule;
the lower packer comprises a hollow cylindrical lower packer connecting pipe and a lower packer sealing capsule sleeved on the peripheral pipe wall of the lower packer connecting pipe, a lower packer water injection hole sleeved by the lower packer sealing capsule is penetrated through the pipe wall of the lower packer connecting pipe, and the lower packer water injection hole is used for injecting fracturing medium in the lower packer connecting pipe into the lower packer sealing capsule so as to expand the lower packer sealing capsule;
one end of the restrictor is in butt joint communication with the upper packer connecting pipe, the other end of the restrictor is in butt joint communication with the lower packer connecting pipe, a pipe orifice at one end of the upper packer connecting pipe, which is far away from the restrictor, is connected with a one-way valve, a pipe orifice at one end of the lower packer connecting pipe, which is far away from the restrictor, is connected with a lower packer lower seal head, jet holes penetrating into the lower packer connecting pipe are formed in the side wall of the lower packer lower seal head, and the lower packer lower seal head is used for being connected with an external fracturing medium injection pipeline.
As a further preferable technical scheme of the invention, the one-way valve comprises a round table shell and a plugging ball, wherein the round table shell is provided with an opening communicated with the upper packer connecting pipe, the plugging ball is arranged in the round table shell, when pressure is generated by fracturing medium in the upper packer connecting pipe, the plugging ball plugs the opening on the round table shell under the pushing of the pressure.
As a further preferable technical scheme of the invention, an upper packer upper seal head is sleeved on one end pipe orifice of the upper packer connecting pipe far away from the throttle, and the upper packer connecting pipe is fixedly connected with the one-way valve through the upper packer upper seal head.
As a further preferable technical scheme of the invention, an orifice sleeve for connecting the throttle is connected with an upper packer lower seal head on the upper packer connecting pipe, and the upper packer connecting pipe is fixedly connected with the throttle through the upper packer lower seal head.
As a further preferable technical scheme of the invention, an upper packer sliding sleeve is movably sleeved on the pipe body of the upper packer connecting pipe, one end of the upper packer sealing capsule is fixedly connected with the upper packer sliding sleeve, and the other end of the upper packer sealing capsule is fixedly connected with the upper packer lower sealing head.
As a further preferable technical scheme of the invention, a pipe orifice sleeve used for connecting the throttle is connected with a lower packer upper seal head on the lower packer connecting pipe, and the lower packer connecting pipe is fixedly connected with the throttle through the lower packer upper seal head.
As a further preferable technical scheme of the invention, a lower packer sliding sleeve is movably sleeved on the pipe body of the lower packer connecting pipe, one end of the lower packer sealing capsule is fixedly connected with the lower packer sliding sleeve, and the other end of the lower packer sealing capsule is fixedly connected with the lower packer upper sealing head.
As a further preferable technical scheme of the invention, the lower packer lower seal head is in a shape of a round table with a wide upper part and a narrow lower part, a central hole of the lower packer lower seal head is used for communicating a fracturing medium injection pipeline with a lower packer connecting pipe, a jet hole is formed on the round table side wall of the lower packer lower seal head, and an included angle between the axial direction of the jet hole and the axial direction of the lower packer connecting pipe is 15-60 degrees.
As a further preferable technical scheme of the invention, the number of the jet holes is a plurality of jet holes, and the jet holes are arranged at intervals around the periphery of the lower packer lower head.
As a further preferable technical scheme of the invention, the fracturing medium is water.
The pressure-injection integrated packer device for hydraulic fracturing of hard thick-roof coal can achieve the following beneficial effects by adopting the technical scheme:
1) The hydraulic fracturing and injection integrated packer device for the hard and thick roof coal can effectively and accurately fracture the hard and thick roof coal, and ensure that the size of the fractured hard and thick roof coal accords with the maximum size of a coal discharge port, thereby greatly reducing the material resources and manpower of hydraulic fracturing of the hard and thick roof coal of a mine, and solving the problem that the hard and thick roof coal is difficult to collapse;
2) The hard thick roof coal can be effectively cracked by the synchronous action of the fracturing medium fracturing and the fracturing medium jet flow, so that the requirement that the hard thick roof coal after being cracked falls into a coal discharge port is met;
3) The invention has reasonable and compact structure and convenient use, reduces the working procedures of underground operation, improves the coal discharging operation efficiency, and reduces the workload of workers.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of an example provided by a pressure-injection integrated packer device for hydraulic fracturing of hard thick roof coal of the present invention;
FIG. 2 is a schematic front view of a lower head of the lower packer;
FIG. 3 is a schematic bottom view of a lower head of the lower packer.
In the figure: 1. the sealing device comprises a one-way valve, a sealing ball, a 3, an upper packer connecting pipe, a 4, an upper packer upper end socket, a 5, an upper packer lower end socket, a 6, an upper packer sliding sleeve, a 7, an upper packer sealing capsule, a 8, an upper packer water injection hole, a 9, a restrictor, a 10, a lower packer connecting pipe, a 11, a lower packer upper end socket, a 12, a lower packer lower end socket, a 13, a lower packer sliding sleeve, a 14, a lower packer sealing capsule, a 15, a lower packer water injection hole, a 16 and a jet hole.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The invention will be further described with reference to the drawings and detailed description. The terms such as "upper", "lower", "left", "right", "middle" and "a" in the preferred embodiments are merely descriptive, but are not intended to limit the scope of the invention, as the relative relationship changes or modifications may be otherwise deemed to be within the scope of the invention without substantial modification to the technical context.
As shown in fig. 1, the invention provides a pressure-injection integrated packer device for hydraulic fracturing of hard and thick roof coal, which comprises a one-way valve 1, an upper packer, a lower packer and a restrictor 9, wherein the upper packer, the restrictor 9 and the lower packer are sequentially connected and communicated, an injection cavity formed by communication is used for injecting a fracturing medium, the one-way valve 1 is used for automatically sealing the injection cavity under the pressure action of the fracturing medium, and the used fracturing medium is water.
The upper packer comprises a hollow cylindrical upper packer connecting pipe 3 and an upper packer sealing capsule 7 sleeved on the peripheral pipe wall of the upper packer connecting pipe 3, an upper packer water injection hole 8 sleeved by the upper packer sealing capsule 7 is penetrated through the pipe wall of the upper packer connecting pipe 3, and the upper packer water injection hole 8 is used for injecting fracturing medium in the upper packer connecting pipe 3 into the upper packer sealing capsule 7 so as to expand the upper packer sealing capsule 7;
the lower packer comprises a hollow cylindrical lower packer connecting pipe 10 and a lower packer sealing capsule 14 sleeved on the peripheral pipe wall of the lower packer connecting pipe 10, a lower packer water injection hole 15 sleeved by the lower packer sealing capsule 14 is penetrated through the pipe wall of the lower packer connecting pipe 10, and the lower packer water injection hole 15 is used for injecting fracturing medium in the lower packer connecting pipe 10 into the lower packer sealing capsule 14 so as to expand the lower packer sealing capsule 14;
one end of the restrictor 9 is in butt joint communication with the upper packer connecting pipe 3, the other end of the restrictor 9 is in butt joint communication with the lower packer connecting pipe 10, one end pipe orifice of the upper packer connecting pipe 3, which is far away from the restrictor 9, is connected with a one-way valve 1, one end pipe orifice of the lower packer connecting pipe 10, which is far away from the restrictor 9, is connected with a lower packer lower seal head 12, jet holes 16 penetrating into the lower packer connecting pipe 10 are formed in the side wall of the lower packer lower seal head 12, the number of the jet holes 16 is multiple, the jet holes 16 are arranged around the peripheral interval of the lower packer lower seal head 12, and the lower packer lower seal head 12 is used for being connected with an external fracturing medium injection pipeline.
Working principle: in the using process of the pressure-injection integrated packer device, the packer device is required to be connected with a fracturing medium injection pipeline and then pushed to a fracturing position of a borehole in a coal bed, and the fracturing medium injection pipeline is connected with a pressurizing pump. After an external fracturing medium injection pipeline injects fracturing medium with pressure into the injection cavity through a lower packer lower seal head 12, firstly, a one-way valve 1 seals the upper packer connecting pipe 3 under the pressure action of the fracturing medium so as to enable the injection cavity to form a sealed cavity, as the fracturing medium continues to be injected, the pressure in the injection cavity is further increased, the fracturing medium can be respectively injected into an upper packer sealing capsule 7 and a lower packer sealing capsule 14 through an upper packer water injection hole 8 and a lower packer water injection hole 15 and expand the upper packer sealing capsule 7 and the lower packer sealing capsule 14, at the moment, the upper packer sealing capsule 7 and the lower packer sealing capsule 14 form separate pressure spaces together with a borehole wall between the upper packer sealing capsule and the lower packer sealing capsule, the throttle 9 is positioned in the separate pressure spaces so as to be used for discharging fracturing fluid from the injection cavity to fracture surrounding coal bodies, so that large-scale separate-fracturing of the hard-roof coal is realized, and the fracturing medium can further eject the hard-roof fracture-roof coal in a small-thickness range under the condition of high pressure through an injection hole 16 on the side face of the lower packer lower seal head, and the coal can further collapse in the small-roof coal injection operation. It should be noted that, the pipe body of the restrictor 9 is uniformly provided with holes, the high-pressure fracturing medium in the injection cavity is ejected from the holes to realize coal seam fracturing, meanwhile, the restrictor 9 can control the flow speed and flow of the fracturing medium ejected by the restrictor, the restrictor 9 used in the invention is the existing equipment, and the detailed structure and principle thereof are not described herein.
In specific implementation, the check valve 1 comprises a round platform shell and a plugging ball 2, the round platform shell is provided with an opening communicated with the upper packer connecting pipe 3, the plugging ball 2 is arranged in the round platform shell, when fracturing medium in the upper packer connecting pipe 3 generates pressure, the plugging ball 2 plugs the opening on the round platform shell under the pushing of the pressure.
In specific implementation, an upper packer upper seal head 4 is sleeved on an orifice of one end of the upper packer connecting pipe 3 far away from the restrictor 9, and the upper packer connecting pipe 3 is fixedly connected with the one-way valve 1 through the upper packer upper seal head 4. The orifice sleeve for connecting the restrictor 9 on the upper packer connecting pipe 3 is connected with an upper packer lower seal head 5, and the upper packer connecting pipe 3 is fixedly connected with the restrictor 9 through the upper packer lower seal head 5.
The pipe body of the upper packer connecting pipe 3 is movably sleeved with an upper packer sliding sleeve 6, one end of an upper packer sealing capsule 7 is fixedly connected with the upper packer sliding sleeve 6, the other end of the upper packer sealing capsule is fixedly connected with an upper packer lower seal head 5, and the upper packer lower seal head 5 and a lower packer lower seal head 12 can play a role in limiting the position of the upper packer sealing capsule 7.
In specific implementation, a pipe orifice sleeve for connecting the restrictor 9 is connected to the lower packer connecting pipe 10, and the lower packer connecting pipe 10 is fixedly connected with the restrictor 9 through the lower packer upper end sleeve 11.
The pipe body of the lower packer connecting pipe 10 is movably sleeved with a lower packer sliding sleeve 13, one end of a lower packer sealing capsule 14 is fixedly connected with the lower packer sliding sleeve 13, and the other end is fixedly connected with a lower packer upper seal head 11.
Preferably, the lower packer lower head 12 is in a shape of a truncated cone with a wide upper part and a narrow lower part, a central hole of the lower packer lower head 12 is used for communicating a fracturing medium injection pipeline with the lower packer connecting pipe 10, the jet holes 16 are formed in the side wall of the truncated cone of the lower packer lower head 12, an included angle between the axial direction of the jet holes 16 and the axial direction of the lower packer connecting pipe 10 is 15-60 degrees, and the number of the jet holes 16 on the lower packer lower head 12 is four and is arranged at equal intervals, as shown in fig. 2 and 3.
While particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely illustrative, and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined only by the appended claims.
Claims (10)
1. The utility model provides a hard thick roof coal hydraulic fracturing is with penetrating integration packer device which characterized in that includes upper packer, lower packer and choke, wherein:
the upper packer comprises a hollow cylindrical upper packer connecting pipe and an upper packer sealing capsule sleeved on the peripheral pipe wall of the upper packer connecting pipe, an upper packer water injection hole sleeved by the upper packer sealing capsule is penetrated through the pipe wall of the upper packer connecting pipe, and the upper packer water injection hole is used for injecting fracturing medium in the upper packer connecting pipe into the upper packer sealing capsule so as to expand the upper packer sealing capsule;
the lower packer comprises a hollow cylindrical lower packer connecting pipe and a lower packer sealing capsule sleeved on the peripheral pipe wall of the lower packer connecting pipe, a lower packer water injection hole sleeved by the lower packer sealing capsule is penetrated through the pipe wall of the lower packer connecting pipe, and the lower packer water injection hole is used for injecting fracturing medium in the lower packer connecting pipe into the lower packer sealing capsule so as to expand the lower packer sealing capsule;
one end of the restrictor is in butt joint communication with the upper packer connecting pipe, the other end of the restrictor is in butt joint communication with the lower packer connecting pipe, a pipe orifice at one end of the upper packer connecting pipe, which is far away from the restrictor, is connected with a one-way valve, a pipe orifice at one end of the lower packer connecting pipe, which is far away from the restrictor, is connected with a lower packer lower seal head, jet holes penetrating into the lower packer connecting pipe are formed in the side wall of the lower packer lower seal head, and the lower packer lower seal head is used for being connected with an external fracturing medium injection pipeline.
2. The pressure-injection integrated packer device for hydraulic fracturing of hard and thick roof coal according to claim 1, wherein the one-way valve comprises a round table shell and a plugging ball, the round table shell is provided with an opening communicated with the upper packer connecting pipe, the plugging ball is arranged in the round table shell, when pressure is generated by a fracturing medium in the upper packer connecting pipe, the plugging ball plugs the opening on the round table shell under the pushing of the pressure.
3. The pressure-injection integrated packer device for hydraulic fracturing of hard and thick roof coal according to claim 2, wherein an end pipe orifice of the upper packer connecting pipe far away from the restrictor is sleeved with an upper packer upper end socket, and the upper packer connecting pipe is fixedly connected with the one-way valve through the upper packer upper end socket.
4. The pressure-injection integrated packer device for hydraulic fracturing of hard and thick roof coal, as claimed in claim 3, wherein a pipe orifice sleeve for connecting the restrictor is connected with an upper packer lower seal head, and the upper packer connecting pipe is fixedly connected with the restrictor through the upper packer lower seal head.
5. The pressure-injection integrated packer device for hydraulic fracturing of hard and thick roof coal, as claimed in claim 4, wherein an upper packer sliding sleeve is movably sleeved on a pipe body of the upper packer connecting pipe, one end of the upper packer sealing capsule is fixedly connected with the upper packer sliding sleeve, and the other end of the upper packer sealing capsule is fixedly connected with the upper packer lower head.
6. The pressure-injection integrated packer device for hydraulic fracturing of hard and thick roof coal, as claimed in claim 1, wherein a pipe orifice sleeve for connecting the restrictor is connected with a lower packer upper seal head, and the lower packer connecting pipe is fixedly connected with the restrictor through the lower packer upper seal head.
7. The pressure-injection integrated packer device for hydraulic fracturing of hard and thick roof coal, as claimed in claim 6, wherein a lower packer sliding sleeve is movably sleeved on a pipe body of the lower packer connecting pipe, one end of the lower packer sealing capsule is fixedly connected with the lower packer sliding sleeve, and the other end of the lower packer sealing capsule is fixedly connected with the lower packer upper end socket.
8. The pressure-injection integrated packer device for hydraulic fracturing of hard and thick roof coal according to claim 1, wherein the lower packer lower head is in a shape of a round table with a wide upper part and a narrow lower part, a central hole of the lower packer lower head is used for a fracturing medium injection pipeline to be communicated with a lower packer connecting pipe, an injection hole is formed in the side wall of the round table of the lower packer lower head, and an included angle between the axial direction of the injection hole and the axial direction of the lower packer connecting pipe is 15-60 degrees.
9. The pressure-injection integrated packer device for hydraulic fracturing of hard and thick roof coal of claim 1, wherein the number of the jet holes is plural, and the plurality of jet holes are arranged at intervals around the periphery of the lower packer lower head.
10. The pressure-injection integrated packer device for hydraulic fracturing of hard and thick roof coals of any one of claims 1-9, wherein the fracturing medium is water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210148531.XA CN114542005B (en) | 2022-02-17 | 2022-02-17 | Pressure-injection integrated packer device for hydraulic fracturing of hard thick-roof coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210148531.XA CN114542005B (en) | 2022-02-17 | 2022-02-17 | Pressure-injection integrated packer device for hydraulic fracturing of hard thick-roof coal |
Publications (2)
| Publication Number | Publication Date |
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| CN114542005A CN114542005A (en) | 2022-05-27 |
| CN114542005B true CN114542005B (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210148531.XA Active CN114542005B (en) | 2022-02-17 | 2022-02-17 | Pressure-injection integrated packer device for hydraulic fracturing of hard thick-roof coal |
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|---|---|---|---|---|
| US4265487A (en) * | 1978-04-10 | 1981-05-05 | The Curators Of The University Of Missouri | High pressure water jet mining machine |
| RU2396429C1 (en) * | 2009-07-09 | 2010-08-10 | Анатолий Николаевич Осипов | Procedure for weakening marginal massif of mine workings at development of coal beds |
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-
2022
- 2022-02-17 CN CN202210148531.XA patent/CN114542005B/en active Active
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|---|---|---|---|---|
| US4265487A (en) * | 1978-04-10 | 1981-05-05 | The Curators Of The University Of Missouri | High pressure water jet mining machine |
| RU2396429C1 (en) * | 2009-07-09 | 2010-08-10 | Анатолий Николаевич Осипов | Procedure for weakening marginal massif of mine workings at development of coal beds |
| CN109736805A (en) * | 2018-12-12 | 2019-05-10 | 天地科技股份有限公司 | A kind of method of the modified release watershed management bump of thick-layer tight roof |
| CN110284921A (en) * | 2019-04-24 | 2019-09-27 | 山东科技大学 | A kind of severe inclined thick coal seam mash gas harnessing method based on binary complex liquid |
| CN111255454A (en) * | 2020-01-17 | 2020-06-09 | 天地科技股份有限公司 | Method for directional roof cutting and pressure relief of hard roof of coal mine |
| CN112031772A (en) * | 2020-07-21 | 2020-12-04 | 大同煤矿集团有限责任公司 | Method for inducing overall damage of overlying residual coal pillars by using high-pressure water jet |
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| Title |
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| 坚硬煤体水力压裂联合深孔爆破提高块煤率研究;庞立宁;煤炭工程;第53卷(第10期);79-83 * |
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| CN114542005A (en) | 2022-05-27 |
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