CN107630717B - Coal bed permeability increasing method with electric pulse and coal bed water injection in cooperation - Google Patents
Coal bed permeability increasing method with electric pulse and coal bed water injection in cooperation Download PDFInfo
- Publication number
- CN107630717B CN107630717B CN201710840327.3A CN201710840327A CN107630717B CN 107630717 B CN107630717 B CN 107630717B CN 201710840327 A CN201710840327 A CN 201710840327A CN 107630717 B CN107630717 B CN 107630717B
- Authority
- CN
- China
- Prior art keywords
- drill hole
- negative electrode
- positive electrode
- coal seam
- electrode drill
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Processing Of Solid Wastes (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
A coal seam permeability increasing method with electric pulse and coal seam water injection in cooperation is suitable for improving the extraction rate of coal seams in low-permeability and high-gas areas. Firstly, constructing a negative electrode drill hole and a positive electrode drill hole in a coal seam, then conveying a high-pressure rubber pipe to the middle part of the drill hole, injecting ionized water with certain pressure into the coal seam after sealing the drill hole, keeping constant water pressure for 20-30 days, and discharging the ionized water in the drill hole through a drainage system. And (3) conveying the positive electrode and the negative electrode to the middle part of the coal seam, enabling the positive electrode and the negative electrode to be in contact with the coal wall, and then discharging to the coal seam through the explosion-proof high-voltage control console and the high-voltage discharge switch to break down the coal seam. And taking out the positive electrode and the negative electrode, and connecting the negative electrode drill hole and the positive electrode drill hole into a gas extraction pipeline. According to the invention, the electric conductivity of the coal body is enhanced by injecting the ionized water into the coal bed, and the energy generated by the high-voltage electric pulse is directly acted on the coal body, so that a large number of cracks are generated in the coal body, and the single-hole gas extraction rate can be effectively increased.
Description
Technical Field
The invention relates to a coal seam permeability increasing method, in particular to a coal seam permeability increasing method with electric pulse and coal seam water injection in cooperation, which is suitable for improving the extraction rate of a coal seam in a low-permeability and high-gas area.
Background
In recent years, as coal mines enter deep mining stages in China, the problems of low coal seam air permeability and high gas content are particularly prominent, and the key point for solving the problems is to improve the air permeability of the coal seam. Currently, common methods for increasing the permeability of coal seams are: the method comprises the following steps of exploiting a liberation layer, hydraulic fracturing, deep hole blasting and the like, but the techniques also have great defects: the mining of the liberation layer has a lot of gangue and is not suitable for the mining of a single coal bed; the direction of hydraulic fracturing is difficult to control, a large amount of water resources are wasted, and the crack propagation range is small; deep hole blasting technology is difficult to convey explosives to a preset place in a soft coal seam. Based on the defects of the existing coal seam permeability increasing technology, it is important to develop a simpler and more effective coal seam permeability increasing method to solve the problem of difficult gas extraction of a low-permeability coal seam.
Disclosure of Invention
The technical problem is as follows: the invention aims to overcome the problems in the prior art and provides a coal seam permeability increasing method with the coordination of electric pulse and coal seam water injection, the coal seam water injection and pulse discharge technology are combined, on the basis of enhancing the conductivity of a coal body by injecting ionic water into the coal seam, high-voltage electric pulse is utilized to generate huge energy which directly acts on the coal seam, a discharge channel is generated between a positive electrode and a negative electrode, the huge energy instantly passes through the discharge channel to form a channel with strong stress waves to crack and dredge the coal body, so that a good migration channel is provided for gas extraction, and the gas extraction efficiency can be effectively increased.
The technical scheme is as follows: the invention discloses a coal bed permeability increasing method with electric pulse and coal bed water injection cooperated, which comprises the following steps:
a. constructing a negative electrode drill hole and a positive electrode drill hole in the coal seam until the negative electrode drill hole and the positive electrode drill hole penetrate through the top plate of the coal seam by 0.5 m;
b. respectively feeding the long high-pressure rubber pipe and the short high-pressure rubber pipe into the negative electrode drill hole and the positive electrode drill hole after construction till the negative electrode drill hole and the positive electrode drill hole are fed into the middle of the coal seam, respectively sealing the negative electrode drill hole and the positive electrode drill hole by using a hole sealer, connecting the end of the long high-pressure rubber pipe exposed out of the hole opening to a water inlet and drainage system, and sealing the short high-pressure rubber pipe exposed out of the hole opening by using a plug;
c. opening a water injection control valve of a water inlet and drainage system, closing the water drainage control valve, respectively injecting ionized water into the negative electrode drill hole and the positive electrode drill hole through a high-pressure water injection system, stopping water injection when the water pressure in the negative electrode drill hole and the positive electrode drill hole reaches 10MPa, and maintaining for 20-30 days;
d. closing the water injection control valve, opening the water drainage control valve, and draining the ionized water in the negative electrode drill hole and the positive electrode drill hole through the water drainage system;
e. opening a plug on a high-pressure rubber pipe at the exposed end of the negative electrode drill hole, conveying a negative electrode connected with the explosion-proof high-pressure control console to the middle part of the negative electrode drill hole from the short high-pressure rubber pipe, simultaneously opening a plug on a short high-pressure rubber pipe exposed out of the positive electrode drill hole, conveying a positive electrode connected with the explosion-proof high-pressure control console to the middle part of the positive electrode drill hole from the short high-pressure rubber pipe, and enabling the negative electrode and the positive electrode to be close;
f. turning on a high-voltage discharge switch to discharge the coal seam, and directly applying huge electric energy to the coal seam so as to generate a large number of cracks and increase the air permeability of the coal seam, and after the coal seam is repeatedly discharged for 50-100 times, turning off the high-voltage discharge switch and taking out a negative electrode and a positive electrode;
g. and c, repeating the steps c, d, e and f for multiple times, and connecting the negative electrode drill hole and the positive electrode drill hole into a gas extraction pipeline for gas extraction.
The conductivity of the ion water injected by the high-pressure water injection system is more than 2000 mu s/cm.
The output voltage of the explosion-proof high-voltage control console is 50-1000 kV.
The distance between the negative electrode drill hole and the positive electrode drill hole is 5-10 m.
The water pressure of the high-pressure water injection system is 0-50 MPa.
Has the advantages that: according to the invention, the coal seam water injection and the high-voltage electric pulse are organically combined, on the basis of enhancing the coal conductivity by injecting the ionized water into the coal seam, the high-voltage electric pulse is utilized to generate huge energy which directly acts on the coal seam, a discharge channel is generated between a positive electrode and a negative electrode, the huge energy instantly passes through the discharge channel to form strong stress waves to crack the coal body and dredge the blocked channel, so that a good migration channel is provided for gas extraction, and the extraction efficiency of gas can be effectively increased. The method is simple to operate, safe and reliable, can effectively improve the single-hole gas extraction rate, and has wide practical value in the technical field.
Drawings
FIG. 1 is a schematic diagram of the coal bed permeability increase method of the invention with electric pulse and coal bed water injection in cooperation;
in the figure: 1-an explosion-proof high-voltage control console, 2-a high-voltage discharge switch, 3-a short high-voltage rubber hose II, 4-a positive electrode, 5-a negative electrode, 6-a negative electrode drilled hole, 7-a positive electrode drilled hole, 8-a hole packer I, 9-a hole packer II, 10-a water injection control valve I, 11-a high-voltage water injection system unified, 12-a coal bed, 13-a drainage control valve I, 14-a drainage system unified, 15-a long high-voltage rubber hose I, 16-a short high-voltage rubber hose I, 17-a long high-voltage rubber hose II, 18-a plug I, 19-a plug II, 20-a water injection control valve II, 21-a high-voltage water injection system II, 22-a drainage control valve II and 23-a drainage system II.
Detailed Description
An embodiment of the present invention is further described below with reference to the accompanying drawings:
the invention discloses a coal bed permeability increasing method with electric pulse and coal bed water injection cooperated, which comprises the following steps:
a. constructing a negative electrode drill hole 6 and a positive electrode drill hole 7 in the coal seam 12 until the coal seam 12 penetrates through the top plate 0.5 m; the distance between the negative electrode drill 6 and the positive electrode drill 7 is 5-10 m;
b. respectively feeding a long high-pressure rubber pipe and a short high-pressure rubber pipe into a negative electrode drill hole 6 and a positive electrode drill hole 7 after construction until the negative electrode drill hole 6 and the positive electrode drill hole 7 are fed into the middle of a coal seam 12, namely feeding a long high-pressure rubber pipe I15 and a short high-pressure rubber pipe I16 into the negative electrode drill hole 6 after construction, feeding a short high-pressure rubber pipe II 3 and a long high-pressure rubber pipe II 17 into the positive electrode drill hole 7 after construction, respectively sealing the negative electrode drill hole 6 and the positive electrode drill hole 7 by using a hole sealing device, connecting 2 long high-pressure rubber pipe ends exposed out of the hole openings with a drainage system, sealing 2 short high-pressure rubber pipes exposed out of the hole openings by using a plug, connecting one end of the long high-pressure rubber pipe I15 to be exposed out of the hole openings of the negative electrode drill hole 6 with the; one end of a second long high-pressure rubber pipe 17 exposed out of the orifice of the positive electrode drill hole 7 is connected with a drainage system, and a second short high-pressure rubber pipe 3 exposed out of the orifice is sealed by a second plug 19;
c. opening a first water injection control valve 10 in a drainage system connected with a first long high-pressure rubber hose 15, closing a first drainage control valve 13, opening a second water injection control valve 20 in the drainage system connected with a second long high-pressure rubber hose 17, closing a second drainage control valve 22, and respectively injecting ionized water into the negative electrode drill hole 6 and the positive electrode drill hole 7 through a first high-pressure water injection system 11 and a second high-pressure water injection system 21, wherein the electric conductivity of the injected ionized water is more than 2000 mus/cm; the water pressure of the high-pressure water injection system is 0-50 MPa. Stopping water injection when the water pressure in the negative electrode drill 6 and the positive electrode drill 7 reaches 10MPa, and maintaining for 20-30 days;
d. closing the first water injection control valve 10 and the second water injection control valve 20, opening the first water discharge control valve 13 and the second water discharge control valve 22, and discharging the ionized water in the negative electrode drill hole 6 and the positive electrode drill hole 7 through the water discharge system unit 14 and the water discharge system unit 23;
e. opening a first plug 18 on a short high-pressure rubber hose 16 with an exposed negative electrode drill hole 6, conveying a negative electrode 5 connected with an explosion-proof high-pressure control console 1 to the middle of the negative electrode drill hole 6 from the short high-pressure rubber hose 16, simultaneously opening a second plug 19 on a short high-pressure rubber hose 3 with an exposed positive electrode drill hole 7, conveying a positive electrode 4 connected with the explosion-proof high-pressure control console 1 to the middle of the positive electrode drill hole 7 from the short high-pressure rubber hose 3, and enabling the negative electrode 5 and the positive electrode 6 to be close to a coal seam 12;
f. and (3) turning on the high-voltage discharge switch 2, and discharging the coal seam 12 through the explosion-proof high-voltage control console 1, wherein the output voltage of the explosion-proof high-voltage control console 1 is 50-1000 kV. Setting voltage according to field conditions, wherein if the set voltage is 500kV, when the voltage reaches 500kV, discharging the coal seam 12 through the high-voltage discharge switch 2, huge electric energy directly acts on the coal seam 12 to generate a large number of cracks and increase the air permeability of the coal seam 12, discharging the coal seam 12 for 50-100 times repeatedly, closing the high-voltage discharge switch 2, and taking out the negative electrode 5 and the positive electrode 4 from the first short high-voltage rubber hose 16 and the second short high-voltage rubber hose 3 respectively;
g. and c, repeating the steps c, d, e and f for multiple times, and connecting the negative electrode drill hole 6 and the positive electrode drill hole 7 into a gas extraction pipeline for gas extraction.
Claims (1)
1. A coal seam permeability increasing method with electric pulse and coal seam water injection in cooperation is characterized by comprising the following steps:
a. constructing a negative electrode drill hole (6) and a positive electrode drill hole (7) in the coal seam (12) until the negative electrode drill hole and the positive electrode drill hole penetrate through the top plate of the coal seam (12) by 0.5 m; the distance between the negative electrode drill hole (6) and the positive electrode drill hole (7) is 5-10 m;
b. respectively feeding a long high-pressure rubber pipe and a short high-pressure rubber pipe into the negative electrode drill hole (6) and the positive electrode drill hole (7) after construction until the negative electrode drill hole and the positive electrode drill hole are fed into the middle part of the coal seam (12), namely feeding a long high-pressure rubber pipe I (15) and a short high-pressure rubber pipe I (16) into the negative electrode drill hole (6) after construction, feeding a short high-pressure rubber pipe II (3) and a long high-pressure rubber pipe II (17) into the positive electrode drill hole (7) after construction, respectively sealing the negative electrode drill hole (6) and the positive electrode drill hole (7) by using a hole sealing device, connecting the end of the long high-pressure rubber pipe exposed out of the hole opening to a water inlet and drainage system, and sealing the short high-;
c. opening a water injection control valve of a water inlet and drainage system, closing the water drainage control valve, respectively injecting ionized water into the negative electrode drill hole (6) and the positive electrode drill hole (7) through a high-pressure water injection system, stopping water injection when the water pressure in the negative electrode drill hole (6) and the positive electrode drill hole (7) reaches 10MPa, and maintaining for 20-30 days; the conductivity of the ion water injected by the high-pressure water injection system is more than 2000 mu s/cm; the water pressure of the high-pressure water injection system is 0-50 MPa;
d. closing the water injection control valve, opening the water drainage control valve, and draining the ionized water in the negative electrode drill hole (6) and the positive electrode drill hole (7) through a water drainage system;
e. opening a plug on a high-pressure rubber hose at the exposed end of a negative electrode drill hole (6), conveying a negative electrode (5) connected with an explosion-proof high-pressure control console (1) to the middle part of the negative electrode drill hole (6) from the short high-pressure rubber hose, simultaneously opening a plug on the short high-pressure rubber hose exposed by a positive electrode drill hole (7), conveying a positive electrode (4) connected with the explosion-proof high-pressure control console (1) to the middle part of the positive electrode drill hole (7) from the short high-pressure rubber hose, and enabling the negative electrode (5) and the positive electrode (4) to be close to a coal seam (12;
f. turning on a high-voltage discharge switch (2), and discharging the coal seam (12) through an explosion-proof high-voltage control console (1), wherein the output voltage of the explosion-proof high-voltage control console (1) is 50-1000 kV; the huge electric energy is directly acted on the coal seam (12), so that a large number of cracks are generated, the air permeability of the coal seam (12) is increased, the high-voltage discharge switch (2) is closed after the coal seam (12) is repeatedly discharged for 50-100 times, and the negative electrode (5) and the positive electrode (4) are taken out;
g. and (d) repeating the steps c, d, e and f for multiple times, and connecting the negative electrode drill hole (6) and the positive electrode drill hole (7) into a gas extraction pipeline for gas extraction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710840327.3A CN107630717B (en) | 2017-09-18 | 2017-09-18 | Coal bed permeability increasing method with electric pulse and coal bed water injection in cooperation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710840327.3A CN107630717B (en) | 2017-09-18 | 2017-09-18 | Coal bed permeability increasing method with electric pulse and coal bed water injection in cooperation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107630717A CN107630717A (en) | 2018-01-26 |
| CN107630717B true CN107630717B (en) | 2020-02-07 |
Family
ID=61101859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710840327.3A Active CN107630717B (en) | 2017-09-18 | 2017-09-18 | Coal bed permeability increasing method with electric pulse and coal bed water injection in cooperation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107630717B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108343378B (en) * | 2018-01-29 | 2019-09-03 | 中国矿业大学 | A kind of coal seam rapid drilling method of the mechanical drilling of electric pulse auxiliary |
| CN109162755B (en) * | 2018-09-11 | 2020-07-28 | 中国矿业大学 | Rock cross-cut coal uncovering method combining electric pulse and grouting reinforcement |
| CN109252861B (en) * | 2018-09-11 | 2020-06-26 | 中国矿业大学 | Electric pulse assisted liquid nitrogen freezing type rock cross-cut coal uncovering method |
| CN109538209B (en) * | 2018-09-11 | 2020-01-21 | 中国矿业大学 | Method for weakening hard roof of coal seam based on electric pulse technology |
| CN110578549B (en) * | 2019-07-23 | 2021-05-04 | 华北科技学院 | Electric explosion and seismic fracturing cooperated microwave heat drive gas extraction system and method |
| CN110485940B (en) * | 2019-09-30 | 2023-06-13 | 中国铁建重工集团股份有限公司 | Rock drilling trolley |
| CN111271038A (en) * | 2020-03-12 | 2020-06-12 | 内蒙古科技大学 | Novel coalbed methane yield increasing method for low-permeability coal body |
| CN111237013B (en) * | 2020-03-13 | 2022-03-22 | 神华神东煤炭集团有限责任公司 | Drainage method and device |
| CN111520140A (en) * | 2020-04-27 | 2020-08-11 | 中国矿业大学 | Rock cross-cut coal uncovering method based on gas injection displacement enhanced electric pulse fracturing |
| CN111520182A (en) * | 2020-04-27 | 2020-08-11 | 中国矿业大学 | Electric pulse fracturing and gas injection displacement synergistic regional gas extraction method |
| CN111550225B (en) * | 2020-05-15 | 2021-04-16 | 燕山大学 | Variable flow pulse hydraulic fracturing method |
| CN112392540B (en) * | 2020-11-19 | 2022-02-01 | 中国矿业大学 | Microwave-assisted pre-splitting and high-voltage pulse synergistic coal seam weakening and permeability increasing device and method |
| CN114320295A (en) * | 2022-01-12 | 2022-04-12 | 辽宁工程技术大学 | Method for preventing rock burst during mining of thick coal seam containing gangue based on electric pulse technology |
| CN115030691B (en) * | 2022-06-20 | 2023-12-15 | 太原理工大学 | Low-permeability coal seam electric pulse heat injection collaborative reinforcement gas extraction method and device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061014A (en) * | 2014-07-07 | 2014-09-24 | 太原理工大学 | Coal seam anti-reflection experiment device based on high-voltage electric pulse |
| CN104481574A (en) * | 2014-09-29 | 2015-04-01 | 中国矿业大学(北京) | Method for improving coal seam gas permeability through high energy acoustoelectric composite technology |
| CN104863561A (en) * | 2015-04-15 | 2015-08-26 | 中国矿业大学 | Underground coalbed pulsed detonation wave directional cracking anti-reflection method |
| CN105275443A (en) * | 2015-11-06 | 2016-01-27 | 中国矿业大学 | Coal mine underground high-power electric knock assisted hydraulic fracturing permeability enhancement method |
| CN106285608A (en) * | 2016-10-28 | 2017-01-04 | 中国矿业大学 | A kind of coal bed gas well pulse-knocking fracturing seepage increasing method |
| CN106593388A (en) * | 2016-12-22 | 2017-04-26 | 中国矿业大学 | Coal-bed gas well electric pulse blockage releasing and permeation enhancing method |
-
2017
- 2017-09-18 CN CN201710840327.3A patent/CN107630717B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061014A (en) * | 2014-07-07 | 2014-09-24 | 太原理工大学 | Coal seam anti-reflection experiment device based on high-voltage electric pulse |
| CN104481574A (en) * | 2014-09-29 | 2015-04-01 | 中国矿业大学(北京) | Method for improving coal seam gas permeability through high energy acoustoelectric composite technology |
| CN104863561A (en) * | 2015-04-15 | 2015-08-26 | 中国矿业大学 | Underground coalbed pulsed detonation wave directional cracking anti-reflection method |
| CN105275443A (en) * | 2015-11-06 | 2016-01-27 | 中国矿业大学 | Coal mine underground high-power electric knock assisted hydraulic fracturing permeability enhancement method |
| CN106285608A (en) * | 2016-10-28 | 2017-01-04 | 中国矿业大学 | A kind of coal bed gas well pulse-knocking fracturing seepage increasing method |
| CN106593388A (en) * | 2016-12-22 | 2017-04-26 | 中国矿业大学 | Coal-bed gas well electric pulse blockage releasing and permeation enhancing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107630717A (en) | 2018-01-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107630717B (en) | Coal bed permeability increasing method with electric pulse and coal bed water injection in cooperation | |
| CN106593388B (en) | A kind of coal bed gas well electrical pulse blocking removing seepage increasing method | |
| WO2017075935A1 (en) | Method of increasing permeability of coal seam using high-power electric blasting assisted by hydraulic fracturing from bottom drainage roadway | |
| CN105275443B (en) | A kind of underground coal mine high power electric detonation shake auxiliary hydraulic fracturing anti-reflection method | |
| CN105370257B (en) | A kind of coal bed gas well high power electric detonation shake auxiliary hydraulic fracturing method for increasing | |
| CN104863628B (en) | One kind utilizes the anti-reflection shielding coal roadway tunneling method of pulse detonation wave fracturing | |
| CN109505565B (en) | Method for extracting coal seam gas by water injection and gas injection alternating displacement | |
| CN108397182B (en) | Device and method for enhancing permeability of coal seam through electric pulse and liquid nitrogen freeze thawing | |
| CN109162755B (en) | Rock cross-cut coal uncovering method combining electric pulse and grouting reinforcement | |
| WO2021189660A1 (en) | Safe and environment-friendly rock blasting device and method | |
| CN106285608A (en) | A kind of coal bed gas well pulse-knocking fracturing seepage increasing method | |
| CN103075128A (en) | Method for sealing gas extraction drill holes | |
| CN203891922U (en) | Effective extraction system for gas in coal seam | |
| CN104453827A (en) | Method for improving air permeability of coal bed in high-energy electric detonation mode | |
| CN106164413A (en) | Utilize fracturing device and the shale gas extracting process thereof of plasma reaction shock wave | |
| CN104533513A (en) | High-pressure abrasive material gas jet coal-breaking pressure relief and permeability improvement equipment and method | |
| CN106930746B (en) | Drilling acetone invades the alternative expression coal seam anti-reflection method combined with hydraulic fracturing | |
| CN105114116A (en) | Method for strengthening regional gas extraction through hydro-thermal coupling fracturing | |
| CN104912588B (en) | Spalling permeability increasing method for rapid excavation of underground seam gateway | |
| CN105317397A (en) | Double cloth bags type grouting sealing set and method | |
| CN206233896U (en) | For the anti-pumping blocking of gas pumping and the outer plugging device of drainage holes | |
| CN205638532U (en) | But colliery is reuse's integrative hole sealing device of gas drainage water injection in pit | |
| CN204532411U (en) | A kind of extension type flushing type gas drainage hole-sealing device | |
| CN204457849U (en) | The anti-reflection equipment of coal release is broken in high-pressure abrasive material gas jet | |
| CN103899270A (en) | Three-wall water injection hole packer for coal mines |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |