CN114737970A - Pre-crack hydraulic fracturing roof cutting pressure relief construction method - Google Patents
Pre-crack hydraulic fracturing roof cutting pressure relief construction method Download PDFInfo
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- CN114737970A CN114737970A CN202210351323.XA CN202210351323A CN114737970A CN 114737970 A CN114737970 A CN 114737970A CN 202210351323 A CN202210351323 A CN 202210351323A CN 114737970 A CN114737970 A CN 114737970A
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- 238000010276 construction Methods 0.000 title claims abstract description 23
- 238000005520 cutting process Methods 0.000 title claims abstract description 13
- 239000003245 coal Substances 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 50
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 1
- 235000017491 Bambusa tulda Nutrition 0.000 claims 1
- 241001330002 Bambuseae Species 0.000 claims 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 1
- 239000011425 bamboo Substances 0.000 claims 1
- 230000008595 infiltration Effects 0.000 claims 1
- 238000001764 infiltration Methods 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 235000013547 stew Nutrition 0.000 claims 1
- 238000005065 mining Methods 0.000 abstract description 4
- 238000004321 preservation Methods 0.000 abstract 1
- 239000012634 fragment Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 238000005553 drilling Methods 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Shovels (AREA)
Abstract
The invention discloses a pre-crack hydraulic fracturing roof cutting pressure relief construction method, which belongs to the technical field of coal mining, wherein a plugging pipe is arranged on the lower end surface of a coal mine roof and is clamped and connected with the coal mine roof, a hole for communicating a through pipe is formed in the plugging pipe, the through pipe extends into the coal mine roof through the plugging pipe, one end of the through pipe is provided with a plugging cylinder, the plugging cylinder is designed in an air bag manner, an expansion cavity is arranged in the plugging cylinder, one end of the plugging cylinder is provided with a jet flow port, the middle part of the jet flow port is communicated with the plugging cylinder, a rotating shaft is arranged in the jet flow port, the outer edge surface of the rotating shaft is provided with a rotating sheet, the outer edge surface of the rotating shaft is also provided with a guide shaft, the outer edge surface of the guide shaft is fixedly connected with a guide plate, and the outer edge surface of the guide plate is abutted against the inner diameter of the through pipe, the pre-crack hydraulic fracturing roof cutting pressure relief construction method is not easy to leak, and the pressure preservation rate is high.
Description
Technical Field
The invention belongs to the technical field of coal mining, and particularly relates to a pre-crack hydraulic fracturing roof cutting pressure relief construction method.
Background
Coal mines are areas where humans mine coal resources in coal-rich mining areas, and are generally divided into underground coal mines and opencast coal mines. When the coal seam is far away from the ground surface, a roadway is excavated to the underground, the roadway is generally selected to be excavated into a mineworker coal mine, and when the mineworker coal mine is mined, the structure of the mineworker coal mine needs to be changed in real time according to the condition of the mining roadway, so that the danger of underground work is reduced.
The traditional pressure relief construction usually adopts a packing pipe to carry out the jet flow after the shutoff, but the shutoff is comparatively troublesome, leaks easily.
Disclosure of Invention
The invention aims to provide a construction method for pre-crack hydraulic fracturing, roof cutting and pressure relief, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a pre-crack hydraulic fracturing roof-cutting pressure relief construction method includes the steps of conducting pre-drilling on the top of a coal seam to be fractured according to needs, after pre-drilling, anchoring a plugging pipe in a pre-drilled hole in an inclined mode, conducting angle adjustment on the plugging pipe according to the coal seam environment or rock stratum distribution of the coal seam, conducting pre-water injection in the anchored plugging pipe after adjustment is completed, standing for about one hour after water injection, continuously observing whether pressure is reduced or not during standing, if water seepage occurs in a position after reduction, and completing continuous fracturing work after confirmation.
Further, the construction method comprises the following specific steps:
s1, setting plugging holes in sequence according to the coal seam environment at the top of the coal seam, wherein the positions of the plugging holes are separated by 10-45 cm by taking the coal seam environment as a reference;
s2, after the plugging hole is established, the pressure is established to be normal, after no water seepage exists, water flow is directly released, the water flow advances in the coal seam along the plugging hole, and whether the water pressure rapidly drops and whether water seepage occurs or not needs to be continuously observed in the fracturing process;
s3, when the pressure drops rapidly, whether the pressure is relieved or not is determined.
Further, the lower terminal surface of colliery roof is located to the shutoff pipe, the shutoff pipe is connected with colliery roof block, the hole that supplies to link up the pipe intercommunication is seted up to the inside of shutoff pipe, the inside that links up the pipe and extend into the colliery roof through the shutoff pipe, the terminal surface is equipped with the jet flow box under the colliery roof.
Furthermore, one side of the jet flow box body is provided with a jet flow pipe, and one end of the jet flow pipe, which is far away from the jet flow box body, is connected with a through pipe.
Furthermore, a plugging cylinder is arranged at one end of the through pipe, the plugging cylinder is designed in an air bag mode, and an expansion cavity is arranged inside the plugging cylinder.
Furthermore, one end of the plugging cylinder is provided with a jet flow port, the middle part of the jet flow port is communicated with the plugging cylinder, a rotating shaft is arranged in the jet flow port, and a rotating sheet is arranged on the outer edge surface of the rotating shaft.
Further, a guide shaft is provided on an outer edge surface of the rotation shaft, a guide plate is fixedly connected to the outer edge surface of the guide shaft, and the outer edge surface of the guide plate is in contact with an inner diameter of the through pipe.
Furthermore, the water source of the jet flow port is washed in the coal mine roof to form a pressure relief cavity, and silt in the pressure relief cavity is further deposited after being intercepted by the plugging cylinder and then continuously sprayed through the jet flow of the jet flow port, so that a passage is conveniently opened up in the coal mine roof.
The technical effects and advantages of the construction method for pre-fracture hydraulic fracturing topping and pressure relief are as follows: when water flow is injected, the plugging cylinder expands through the release of the water flow and is clamped with the other end of the plugging pipe, so that the water flow can effectively plug the through hole of the plugging pipe after being jetted through the jet flow port, a certain plugging rate is improved, and the probability of directly releasing the pressure from the inside due to overlarge pressure is reduced;
because establishing of revolving fragment and aiming axis for rivers drive the revolving fragment to rotate after leading to rivers via running through the siphunculus, and the rotatory in-process of revolving fragment drives silt and leads to the inside of rotatory entering jet orifice after rotating to one side via the guide plate and is absorbed, and the intraoral rivers of jet orifice have certain promotion to the cutting efficiency of stratum after mixing through the silt that the guide plate drove.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view of the embodiment of the present invention shown at B in FIG. 1;
fig. 3 is an enlarged view of the embodiment of the present invention at C in fig. 2.
In the figure: 1. a jet flow box body; 2. a jet pipe; 3. coal mine roof; 4. plugging the pipe; 5. a through pipe; 6. a plugging cylinder; 7. a pressure relief cavity; 8. an expansion chamber; 9. a jet port; 10. a baffle; 11. a rotating shaft; 12. a rotating sheet; 13. a guide shaft.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Please refer to fig. 1-3, which illustrate a construction method of pre-crack hydraulic fracturing roof cutting and pressure relief, wherein a jet flow pipe 2 is arranged at one side of a jet flow box body 1, one end of the jet flow pipe 2, which is far away from the jet flow box body 1, is connected with a through pipe 5, a plugging pipe 4 is arranged at the lower end surface of a coal mine roof 3, the plugging pipe 4 is connected with the coal mine roof 3 in a clamping manner, a hole for communicating the through pipe 5 is arranged inside the plugging pipe 4, the through pipe 5 extends into the coal mine roof 3 through the plugging pipe 4, one end of the through pipe 5 is provided with a plugging cylinder 6, the plugging cylinder 6 adopts an air bag type design, an expansion cavity 8 is arranged inside the plugging cylinder 6, water flow in the jet flow box body 1 enters the through pipe 5 through the jet flow pipe 2, the through pipe 5 extends into the coal mine roof 3 through the plugging pipe 4, after the water flow is injected, when the water flow passes through the plugging cylinder 6, the expansion cavity 8 of the plugging cylinder 6 fills and fixes a gap of the plugging pipe 4 after the water flow is injected and expanded, the other end of the water flow after jet flow further compacts the plugging cylinder 6 due to water pressure, so that the gap of the plugging pipe 4 is difficult to lose water;
one end of the plugging cylinder 6 is provided with a jet flow port 9, the middle part of the jet flow port 9 is communicated with the plugging cylinder 6, a rotating shaft 11 is arranged inside the jet flow port 9, a rotating sheet 12 is arranged on the outer edge surface of the rotating shaft 11, a guide shaft 13 is arranged on the outer edge surface of the rotating shaft 11, a guide plate 10 is fixedly connected with the outer edge surface of the guide shaft 13, the outer edge surface of the guide plate 10 is abutted against the inner diameter of the through pipe 5, a water source of jet flow of the jet flow port 9 is washed inside the coal mine roof 3 to form a pressure relief chamber 7, silt in the pressure relief chamber 7 is further deposited after being intercepted by the plugging cylinder 6 and then continuously sprayed through the jet flow of the jet flow port 9, a passage is conveniently opened inside the coal mine roof 3, when water flows through the jet flow port 9, the rotating sheet 12 starts to rotate under the driving of the water flow due to high-speed flowing through the rotating sheet 12, when the rotating sheet 12 rotates, the guide shaft 13 simultaneously drives the guide plate 10 to start to rotate, therefore, silt water after being jetted by the jet flow opening 9 flows back to the middle through a vortex generated by the rotation of the guide plate 10, so that silt can be mixed in the water flow of the jet flow opening 9 to further wash the interior of the coal mine roof 3, and the washing efficiency is improved;
the top cutting and pressure relief construction method for hydraulic fracturing of the pre-fractured coal seam includes pre-drilling the top of the coal seam to be fractured as required, anchoring a plugging pipe 4 obliquely inside the pre-drilled hole after pre-drilling, adjusting the angle of the plugging pipe 4 according to the coal seam environment or rock stratum distribution of the coal seam, injecting water into the anchored plugging pipe 4 in advance after adjustment is completed, standing for about one hour after water injection, continuously observing whether pressure is reduced during standing, and if water seepage occurs at any position after reduction, finishing continuous fracturing work after confirmation.
Further, the construction method comprises the following concrete steps:
s1, setting plugging holes in sequence according to the coal seam environment at the top of the coal seam, wherein the positions of the plugging holes are separated by 10-45 cm by taking the coal seam environment as a reference;
s2, after the plugging hole is established, the pressure is established to be normal, after no water seepage exists, water flow is directly released, the water flow advances in the coal seam along the plugging hole, and whether the water pressure rapidly drops and whether water seepage occurs or not needs to be continuously observed in the fracturing process;
s3, when the pressure drops rapidly, whether the pressure is relieved or not is determined.
When the construction method for pre-crack hydraulic fracturing topping pressure relief is applied, firstly, the plugging pipes 4 are driven into the lower end face of the coal mine roof 3 according to a preset angle, a plurality of plugging pipes 4 need to be embedded, so as to increase the position capable of releasing pressure, after confirming that the plugging pipe 4 is anchored with the lower end surface of the coal mine roof 3, the through pipe 5 is penetrated into the plugging pipe 4 for pre-water injection, simultaneously detecting whether water seepage or pressure reduction exists, if water seepage or pressure reduction exists, replacing the plugging pipe 4 in another area for repeated operation, after confirming that no water seepage or pressure reduction exists, because the pressure relief cavity 7 should be generated in the sealing tube, the water flow is reduced to slightly reduce the volume of the expansion cavity 8 of the sealing tube 6, and then the sealing tube 5 is further fed until the water flow flows out along the sealing tube 4 in the sealing tube 4, namely the water jet port 9 reaches the inside of the coal mine roof 3, the water flow is increased at the moment, and the gap of the sealing tube 4 is filled and fixed after the expansion cavity 8 is expanded due to the injection of the water flow;
when rivers pass through spout mouth 9, because rivers flow through revolving fragment 12 under high speed state for revolving fragment 12 begins to rotate under the drive of rivers, when revolving fragment 12 was rotatory, guide shaft 13 drives guide plate 10 simultaneously and begins to rotate, thereby the vortex that the silt water behind the 9 spouts streams of spout mouth flows back to the centre through the rotatory production of guide plate 10, thereby make silt can mix and further erode the inside of colliery roof 3 in the rivers of spout mouth 9.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (8)
1. A pre-crack hydraulic fracturing roof cutting pressure relief construction method is characterized by comprising the following steps: carry out the coal seam top of fracturing as required and carry out the trompil in advance, behind the trompil in advance, at the inside slant anchor shutoff pipe (4) of trompil in advance, its shutoff pipe (4) carry out angle modulation according to the coal seam environment or the rock stratum distribution of coal seam, the back of finishing the adjustment, carry out water injection in advance in the shutoff pipe (4) of anchor, it is about an hour to stew after the water injection, whether the pressure reduces to need continuously to observe during the period of steing, if have the position to appear the infiltration after reducing, confirm the back, accomplish and continuously fracture work.
2. A pre-crack hydraulic fracturing roof cutting pressure relief construction method is characterized by comprising the following specific steps:
s1, setting plugging holes in sequence according to the coal seam environment at the top of the coal seam, wherein the positions of the plugging holes are separated by 10-45 cm by taking the coal seam environment as a reference;
s2, after the plugging hole is established, the pressure is established to be normal, after no water seepage exists, water flow is directly released, the water flow advances in the coal seam along the plugging hole, and whether the water pressure rapidly drops and whether water seepage occurs or not needs to be continuously observed in the fracturing process;
s3, when the pressure drops rapidly, whether the pressure is relieved or not is determined.
3. The construction method for pre-fracture hydraulic fracturing topping and pressure relief as claimed in claim 2, wherein: the lower terminal surface of colliery roof (3) is located in shutoff pipe (4), shutoff pipe (4) are connected with colliery roof (3) block, the hole that supplies to link up pipe (5) intercommunication is seted up to the inside of shutoff pipe (4), link up the inside that siphunculus (5) extended into colliery roof (3) through shutoff pipe (4), the terminal surface is equipped with efflux box (1) under colliery roof (3).
4. The construction method for pre-fracture hydraulic fracturing topping and pressure relief as claimed in claim 3, wherein: and a jet pipe (2) is arranged on one side of the jet flow box body (1), and one end, far away from the jet flow box body (1), of the jet pipe (2) is connected with a through pipe (5).
5. The pre-fractured hydraulic fracturing roof cutting and pressure relief construction method according to claim 4, wherein the construction method comprises the following steps: one end of the through pipe (5) is provided with a plugging cylinder (6), the plugging cylinder (6) adopts an air bag type design, and an expansion cavity (8) is arranged inside the plugging cylinder (6).
6. The construction method for pre-fracture hydraulic fracturing topping and pressure relief as claimed in claim 5, wherein: one end of the blocking cylinder (6) is provided with a jet flow port (9), the middle of the jet flow port (9) is communicated with the blocking cylinder (6), a rotating shaft (11) is arranged inside the jet flow port (9), and a rotating sheet (12) is arranged on the outer edge surface of the rotating shaft (11).
7. The construction method for pre-fracture hydraulic fracturing topping and pressure relief as claimed in claim 6, wherein: the outer fringe face of rotation axis (11) is equipped with leading axle (13) simultaneously, the outer fringe face fixedly connected with guide plate (10) of leading axle (13), the outer fringe face of guide plate (10) and the internal diameter that passes through pipe (5) are the butt each other.
8. The construction method for pre-fracture hydraulic fracturing topping and pressure relief as claimed in claim 6, wherein: the water source of spout mouth (9) efflux erodes in the inside of colliery roof (3) and forms pressure-relief chamber (7), silt in pressure-relief chamber (7) further silts up after the interception of shutoff section of thick bamboo (6) and continuously sprays through the efflux of spout mouth (9) afterwards, conveniently opens up the route in the inside of colliery roof (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210351323.XA CN114737970A (en) | 2022-04-02 | 2022-04-02 | Pre-crack hydraulic fracturing roof cutting pressure relief construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210351323.XA CN114737970A (en) | 2022-04-02 | 2022-04-02 | Pre-crack hydraulic fracturing roof cutting pressure relief construction method |
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| CN202210351323.XA Pending CN114737970A (en) | 2022-04-02 | 2022-04-02 | Pre-crack hydraulic fracturing roof cutting pressure relief construction method |
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| CN112814639A (en) * | 2021-02-04 | 2021-05-18 | 广州海洋地质调查局 | Expansion type staged fracturing process pipe column and fracturing method |
| CN112855155A (en) * | 2021-04-02 | 2021-05-28 | 中国矿业大学 | Gob-side entry retaining thick hard roof segmented directional hydraulic fracturing method |
| CN114165232A (en) * | 2021-12-15 | 2022-03-11 | 山西潞安环保能源开发股份有限公司常村煤矿 | Method for hydraulic fracturing, roof cutting and pressure relief of underground coal mine end mining roof |
| CN114183114A (en) * | 2021-12-07 | 2022-03-15 | 中国矿业大学 | Hydraulic punching and cave-making cooperative steam injection enhanced gas extraction method |
-
2022
- 2022-04-02 CN CN202210351323.XA patent/CN114737970A/en active Pending
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| CN102213077A (en) * | 2011-05-25 | 2011-10-12 | 煤炭科学研究总院沈阳研究院 | Coal seam reaming system using three-dimensional (3D) swirling water jet and reaming and fracturing method for permeability enhancement |
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| CN112324337A (en) * | 2020-11-05 | 2021-02-05 | 河南神火煤电股份有限公司 | Whole-process gas extraction method for through-layer top comb-shaped drilling of bottom plate of soft coal seam |
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| CN112814639A (en) * | 2021-02-04 | 2021-05-18 | 广州海洋地质调查局 | Expansion type staged fracturing process pipe column and fracturing method |
| CN112855155A (en) * | 2021-04-02 | 2021-05-28 | 中国矿业大学 | Gob-side entry retaining thick hard roof segmented directional hydraulic fracturing method |
| CN114183114A (en) * | 2021-12-07 | 2022-03-15 | 中国矿业大学 | Hydraulic punching and cave-making cooperative steam injection enhanced gas extraction method |
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