CN113775372A - Method for extracting coal seam gas by coal mine fixed-point fracturing - Google Patents
Method for extracting coal seam gas by coal mine fixed-point fracturing Download PDFInfo
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- CN113775372A CN113775372A CN202111156078.9A CN202111156078A CN113775372A CN 113775372 A CN113775372 A CN 113775372A CN 202111156078 A CN202111156078 A CN 202111156078A CN 113775372 A CN113775372 A CN 113775372A
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- 239000003245 coal Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000000605 extraction Methods 0.000 claims abstract description 27
- 239000002775 capsule Substances 0.000 claims abstract description 26
- 238000012856 packing Methods 0.000 claims abstract description 22
- 238000005553 drilling Methods 0.000 claims abstract description 11
- 239000007921 spray Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005065 mining Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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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
- 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)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
A method for extracting coal seam gas by coal mine fixed-point fracturing comprises the following steps: (1) drilling a main hole and a branch hole in a coal seam and placing a flexible oil pipe; (2) arranging high-pressure water outlets on the flexible oil pipe and separating the adjacent high-pressure water outlets by using a packing capsule; (3) a hydraulic fracturing pump, an orifice anchor, a three-way joint, a high-pressure pipe hoop, a one-way valve, a high-pressure water nozzle, a rear packing capsule and a plug are sequentially connected to the flexible oil pipe positioned in the main hole; (4) connecting a hole anchor, a high-pressure pipe hoop, a front packing capsule, a one-way valve, a high-pressure water nozzle, a rear packing capsule and a plug in sequence on a flexible oil pipe positioned in a branch hole; (5) starting a hydraulic fracturing pump, fracturing coal beds corresponding to high-pressure water outlets of the main hole and the branch holes, and extending fractures; and after fracturing, performing main hole and branch hole combined gas extraction. On the basis of small flow and large pressure, the invention realizes the effect of accurate fracturing.
Description
Technical Field
The invention relates to a method for jointly extracting gas from main and branch holes of a coal seam of a mine, in particular to a method for jointly extracting gas from the coal seam by directionally drilling the main and branch holes in a bedding layer of an underground coal mine.
Background
At present, gas extraction mainly comprises extraction before mining, extraction in mining and extraction after mining. Extraction before mining mainly comprises bedding drilling, ground drilling extraction, void layer drilling extraction and the like, and then a drilling mode of directional drilling gradually appears. The branch hole is formed on the basis of the main hole, so that the gas extraction efficiency is facilitated, the extraction method for forming the branch hole in the main hole is generally adopted at present, when the main hole and the branch hole are required to be extracted, the existing method basically takes the respective extraction of the main hole and the branch hole as the main part, the method is complex and labor-consuming, the extraction time and the extraction cost cannot be saved, and the extraction efficiency cannot be further improved.
Disclosure of Invention
The invention aims to provide a method for jointly extracting gas from main and branch holes of a mine coal seam, which can jointly extract the gas from the main and branch holes under the condition of improving the extraction efficiency.
In order to achieve the purpose, the invention provides a method for extracting gas from main and branch holes of a mine coal seam in a combined manner.
The technical scheme adopted by the invention is as follows: a method for extracting coal seam gas by coal mine fixed-point fracturing comprises the following steps:
1. drilling a main hole in a high-order bedding layer of a coal seam, and forming a branch hole in the main hole;
2. respectively placing the flexible oil pipes (4) in the main holes and the branch holes;
3. a plurality of high-pressure water outlets are arranged on the flexible oil pipe (4) and the adjacent high-pressure water outlets are separated by using a packing capsule;
4. a hydraulic fracturing pump (1), an orifice anchor (3), a three-way joint (5), a high-pressure pipe hoop (7), a one-way valve (12), a high-pressure water nozzle (15), a rear packing capsule (13) and a plug (14) are sequentially connected to a flexible oil pipe (4) positioned in a main hole;
5. an orifice anchor (3), a high-pressure pipe hoop (7), a front packing capsule (9), a one-way valve (12), a high-pressure water nozzle (15), a rear packing capsule (13) and a plug (14) are sequentially connected to a flexible oil pipe (4) positioned in a branch hole;
6. starting the hydraulic fracturing pump, wherein one part of pressure is concentrated on the high-pressure water spray nozzle between the main hole double-sealed capsules, and the other part of pressure is concentrated on the high-pressure water outlets of the branch holes; the coal bed corresponding to the high-pressure water outlet is fractured, and the fracture is extended;
7. and after fracturing, performing main hole and branch hole combined gas extraction.
The invention has the advantages of
1. The invention provides a method for hydraulic fracturing combined extraction of a main hole and a branch hole, which can effectively increase the gas extraction efficiency and save the extraction cost;
2. by adopting a point type fracturing method of the main hole and the branch hole, the requirement on the flow of fracturing fluid can be reduced on the basis of meeting the extraction requirement, and accurate fracturing is realized;
3. when gas is extracted, the main branch hole and the branch hole can be jointly extracted, and the extraction difficulty and cost are reduced.
The invention abandons the traditional mode of respectively extracting the main hole and the branch hole, adopts a combined extraction method, and simultaneously performs all extraction operations on the main hole and the branch hole, thereby saving the cost, shortening the extraction time and improving the extraction efficiency.
During hydraulic fracturing, water pressure is accurately fractured according to the position of expected action, and the main hole and the branch hole of the directional drilling hole can be fractured and extracted simultaneously. After the drill hole is formed, fixing and sealing the oil pipe by using an orifice anchor and a double-seal capsule; the main hole and the branch hole are fractured in a point type way; after water is injected, water pressure in the main hole and the branch hole acts on the point for fracturing, pressure loss is greatly reduced, the effects of accurate pressure application and small flow and high pressure can be achieved, and the main hole and the branch hole can be used for jointly extracting gas after fracturing is completed.
The invention realizes the effect of accurate fracturing on the basis of small flow and large pressure. Due to the fact that the single points in the main holes and the branch holes have large acting pressure, the acting area in the single holes is large, and the purposes of reducing the number of the branch holes, reducing coal bed pollution and saving cost are achieved.
Drawings
Fig. 1 is a layout of a main bore hydraulic fracturing apparatus of the present invention.
Fig. 2 is a layout diagram of a branched hole hydraulic fracturing device of the present invention.
In the figure: 1. the hydraulic fracturing pump comprises a hydraulic fracturing pump body, 2 parts of a main hole, 3 parts of an orifice anchor, 4 parts of a flexible oil pipe, 5 parts of a three-way joint, 6 parts of a branch hole, 7 parts of a high-pressure pipe hoop, 8 parts of a water outlet, 9 parts of a front packing capsule, 10 parts of a screw thread, 11 parts of a segmentation point, 12 parts of a one-way valve, 13 parts of a rear packing capsule, 14 parts of a plug, 15 parts of a high-pressure water jet, 16 parts of a branch hole.
Detailed Description
The invention is further described below with reference to fig. 1 and 2:
as shown in fig. 1, a method for extracting coal seam gas by coal mine fixed-point fracturing comprises the following steps:
1. drilling a main hole in a high-order bedding layer of a coal seam, and forming a branch hole in the main hole;
2. respectively placing the flexible oil pipes (4) in the main holes and the branch holes;
3. a plurality of high-pressure water outlets are arranged on the flexible oil pipe (4) and the adjacent high-pressure water outlets are separated by using a packing capsule;
4. a hydraulic fracturing pump (1), an orifice anchor (3), a three-way joint (5), a high-pressure pipe hoop (7), a one-way valve (12), a high-pressure water nozzle (15), a rear packing capsule (13) and a plug (14) are sequentially connected to a flexible oil pipe (4) positioned in a main hole;
5. an orifice anchor (3), a high-pressure pipe hoop (7), a front packing capsule (9), a one-way valve (12), a high-pressure water nozzle (15), a rear packing capsule (13) and a plug (14) are sequentially connected to a flexible oil pipe (4) positioned in a branch hole;
6. starting the hydraulic fracturing pump, wherein one part of pressure is concentrated on the high-pressure water spray nozzle between the main hole double-sealed capsules, and the other part of pressure is concentrated on the high-pressure water outlets of the branch holes; the coal bed corresponding to the high-pressure water outlet is fractured, and the fracture is extended;
7. and after fracturing, performing main hole and branch hole combined gas extraction.
Claims (4)
1. A method for extracting coal seam gas by coal mine fixed-point fracturing is characterized by comprising the following steps:
(1) drilling a main hole in a high-order bedding layer of a coal seam, and forming a branch hole in the main hole;
(2) respectively placing the flexible oil pipes (4) in the main holes and the branch holes;
(3) a plurality of high-pressure water outlets are arranged on the flexible oil pipe (4) and the adjacent high-pressure water outlets are separated by using a packing capsule;
(4) a hydraulic fracturing pump (1), an orifice anchor (3), a three-way joint (5), a high-pressure pipe hoop (7), a one-way valve (12), a high-pressure water nozzle (15), a rear packing capsule (13) and a plug (14) are sequentially connected to a flexible oil pipe (4) positioned in a main hole;
(5) an orifice anchor (3), a high-pressure pipe hoop (7), a front packing capsule (9), a one-way valve (12), a high-pressure water nozzle (15), a rear packing capsule (13) and a plug (14) are sequentially connected to a flexible oil pipe (4) positioned in a branch hole;
(6) starting the hydraulic fracturing pump, wherein one part of pressure is concentrated on the high-pressure water spray nozzle between the main hole double-sealed capsules, and the other part of pressure is concentrated on the high-pressure water outlets of the branch holes; the coal bed corresponding to the high-pressure water outlet is fractured, and the fracture is extended;
(7) and after fracturing, performing main hole and branch hole combined gas extraction.
2. The method for extracting coal bed gas through coal mine fixed point fracturing, as claimed in claim 1, wherein the main hole is divided into a plurality of sections by the branch hole, each section comprises two packing capsules, and a high pressure water nozzle for point fracturing is arranged between the packing capsules.
3. The method for extracting coal bed gas through coal mine fixed point fracturing according to claim 1, wherein the branch hole is provided with a plurality of sections, each section is separated by two packing capsules, and a high-pressure water nozzle for point fracturing is arranged between the packing capsules.
4. The method for extracting coal seam gas through coal mine fixed point fracturing, according to claim 1, is characterized in that the main hole is drilled directionally along the bedding layer, and the branch holes are communicated with the main hole in the coal seam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111156078.9A CN113775372A (en) | 2021-09-30 | 2021-09-30 | Method for extracting coal seam gas by coal mine fixed-point fracturing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111156078.9A CN113775372A (en) | 2021-09-30 | 2021-09-30 | Method for extracting coal seam gas by coal mine fixed-point fracturing |
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| CN113775372A true CN113775372A (en) | 2021-12-10 |
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| CN202111156078.9A Pending CN113775372A (en) | 2021-09-30 | 2021-09-30 | Method for extracting coal seam gas by coal mine fixed-point fracturing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116291691A (en) * | 2023-03-27 | 2023-06-23 | 河南焦煤能源有限公司 | Efficient hydraulic fracturing gas extraction system |
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| US5576485A (en) * | 1995-04-03 | 1996-11-19 | Serata; Shosei | Single fracture method and apparatus for simultaneous measurement of in-situ earthen stress state and material properties |
| CN101424180A (en) * | 2007-04-30 | 2009-05-06 | 普拉德研究及开发股份有限公司 | Well treatment using electric submersible pumping system |
| CN102777155A (en) * | 2011-05-13 | 2012-11-14 | 中国石油化工股份有限公司 | Shale gas bridge plug subsection completion method |
| CN205063929U (en) * | 2015-10-08 | 2016-03-02 | 河南理工大学 | Colliery is sealed in pit and is pressed integration segmentation hydraulic fracturing device |
| CN107288540A (en) * | 2016-03-31 | 2017-10-24 | 中国石油化工股份有限公司 | A kind of oil/gas drilling volume increase connection makees device and method |
| US20170370156A1 (en) * | 2015-11-30 | 2017-12-28 | China University Of Mining And Technology | Method of performing combined drilling, flushing, and cutting operations on coal seam having high gas content and prone to bursts to relieve pressure and increase permeability |
| US20200080382A1 (en) * | 2018-04-12 | 2020-03-12 | Shandong University Of Science And Technology | Drill-power-based directional hydraulic fracturing system for downhole quick slotting and method thereof |
| 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 |
-
2021
- 2021-09-30 CN CN202111156078.9A patent/CN113775372A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4452489A (en) * | 1982-09-20 | 1984-06-05 | Methane Drainage Ventures | Multiple level methane drainage shaft method |
| US5576485A (en) * | 1995-04-03 | 1996-11-19 | Serata; Shosei | Single fracture method and apparatus for simultaneous measurement of in-situ earthen stress state and material properties |
| CN101424180A (en) * | 2007-04-30 | 2009-05-06 | 普拉德研究及开发股份有限公司 | Well treatment using electric submersible pumping system |
| CN102777155A (en) * | 2011-05-13 | 2012-11-14 | 中国石油化工股份有限公司 | Shale gas bridge plug subsection completion method |
| CN205063929U (en) * | 2015-10-08 | 2016-03-02 | 河南理工大学 | Colliery is sealed in pit and is pressed integration segmentation hydraulic fracturing device |
| US20170370156A1 (en) * | 2015-11-30 | 2017-12-28 | China University Of Mining And Technology | Method of performing combined drilling, flushing, and cutting operations on coal seam having high gas content and prone to bursts to relieve pressure and increase permeability |
| CN107288540A (en) * | 2016-03-31 | 2017-10-24 | 中国石油化工股份有限公司 | A kind of oil/gas drilling volume increase connection makees device and method |
| US20200080382A1 (en) * | 2018-04-12 | 2020-03-12 | Shandong University Of Science And Technology | Drill-power-based directional hydraulic fracturing system for downhole quick slotting and method thereof |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116291691A (en) * | 2023-03-27 | 2023-06-23 | 河南焦煤能源有限公司 | Efficient hydraulic fracturing gas extraction system |
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Application publication date: 20211210 |