CN114320432A - Coal seam water injection wetting method based on mechanical wave resonance - Google Patents
Coal seam water injection wetting method based on mechanical wave resonance Download PDFInfo
- Publication number
- CN114320432A CN114320432A CN202210058736.9A CN202210058736A CN114320432A CN 114320432 A CN114320432 A CN 114320432A CN 202210058736 A CN202210058736 A CN 202210058736A CN 114320432 A CN114320432 A CN 114320432A
- Authority
- CN
- China
- Prior art keywords
- coal seam
- water injection
- wetting
- mechanical wave
- wave resonance
- 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.)
- Granted
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The application provides a coal seam water injection wetting method based on mechanical wave resonance, which comprises the following steps: step 1, drilling a borehole on an operation surface, pre-pumping gas, and plugging the borehole when the pressure and the content of the gas in a coal seam are reduced to preset values; step 2, measuring the natural vibration frequency of the coal seam after pre-pumping gas; step 3, arranging at least one coal seam water injection wetting device on the working surface; and 4, adjusting the frequency of the mechanical wave resonance device to enable the coal seam to generate natural vibration, and meanwhile, opening a water injection device to perform water injection wetting on the coal seam. The effect of water injection and wetting can be improved.
Description
Technical Field
The application relates to the field of coal mining, in particular to a coal seam water injection wetting method based on mechanical wave resonance.
Background
In the related technology, a large amount of coal dust is generated during coal mining, so that the health of personnel is threatened, accidents such as coal dust explosion and the like can be induced, and the safety production of a mine is seriously threatened. Coal seam water injection is one of important measures for dust prevention and dust suppression of coal rock working faces. However, the gas in the coal can seriously interfere with the water injection wetting effect: the method comprises the following steps that firstly, most of gas in a coal seam exists in coal pores in an adsorption mode, a gas adsorption film is formed on the surface of coal, and the wetting of water on the surface of the coal is further prevented; secondly, gas molecules and water molecules form competitive adsorption, water molecule adsorption sites are occupied, and the water solution adsorption capacity is reduced; and thirdly, the gas pressure can prevent the invasion of the aqueous solution and further reduce the wetting capacity of the aqueous solution.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the application aims to provide a coal seam water injection wetting method based on mechanical wave resonance, and the water injection wetting effect can be improved.
In order to achieve the above object, the present application provides a coal seam water injection wetting method based on mechanical wave resonance, the coal seam water injection wetting method adopts a coal seam water injection wetting device arranged on an operation surface of a coal seam to wet water injection of the coal seam, the coal seam water injection wetting device includes a water injection device and a mechanical wave resonance device configured on two drill holes away from a set distance on the operation surface, the coal seam water injection wetting method includes the following steps: step 1, drilling the drill hole on the working surface, pre-pumping gas, and plugging the drill hole when the pressure and the content of the gas in the coal seam are reduced to preset values; step 2, measuring the natural vibration frequency of the coal seam after pre-gas extraction; step 3, arranging at least one coal seam water injection wetting device on the working surface; and 4, adjusting the frequency of the mechanical wave resonance device to enable the coal seam to generate natural vibration, and simultaneously opening the water injection device to perform water injection wetting on the coal seam.
According to the wetting method of coal seam water injection provided by the application, through the cooperation of the mechanical wave resonance device and the water injection device, high-pressure water injection can be realized under the condition of coal seam natural vibration, more pore cracks can be generated in the coal seam, the wetting method of coal seam water injection is favorable for water permeation and adsorption, and the wetting effect of coal seam water injection is improved.
In addition, the coal seam water injection wetting method provided by the application can also have the following additional technical characteristics:
further, when gas is pre-extracted in the step 1, stopping gas extraction and plugging the drilled hole when the gas pressure in the coal seam is reduced to 0.74MPa and the gas content is reduced to 8 m/t.
Further, before the natural frequency of the coal bed is measured in the step 2, the coal bed which is subjected to gas pre-extraction is sampled and made into a coal sample.
Further, when the natural frequency of the coal seam is measured in the step 2, the natural frequency of the coal sample is measured by using a coal rock natural frequency testing device to represent the natural frequency of the coal seam after pre-gas extraction.
Further, when the coal seam water injection wetting device is arranged in the step 3, two drill holes with the distance of 8-10 meters are selected on the working surface, wherein the water injection device is arranged on one drill hole, and the mechanical wave resonance device is arranged on the other drill hole.
Furthermore, the water injection device comprises a water injection pipeline, a high-pressure water pump and a water tank, wherein the water injection pipeline extends into the drill hole.
Further, the water injection device also comprises a pressure gauge and a valve.
Further, the mechanical wave resonance device includes a mechanical wave device, a power amplifier, and a signal generator.
Further, when the frequency of the mechanical wave resonance device is adjusted in step 4, the frequency of the mechanical wave resonance device is made to coincide with the natural frequency of the coal sample.
Furthermore, a plurality of coal seam water injection wetting devices are arranged on the working face at intervals of 8-10 meters.
Drawings
Exemplary embodiments of the present application will now be described in detail with reference to the drawings, with the understanding that the following description of the embodiments is intended to be illustrative, and not limiting of the scope of the application, and in which:
FIG. 1 is a flow chart of a method of wetting a coal seam injection water according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a coal seam injection water wetting apparatus according to an embodiment of the present application;
reference numerals:
1. a roadway;
2. a coal seam;
3. a water injection device;
4. a mechanical wave resonance device;
20. working surface;
21. drilling;
31. a water injection pipeline;
32. a pressure gauge;
33. a valve;
34. a high pressure water pipe;
35. a high pressure water pump;
36. a water tank;
41. a mechanical wave device;
42. a power amplifier;
42. a signal generator.
Detailed Description
Preferred embodiments of the present application are described in detail below with reference to examples. However, it should be understood by those skilled in the art that these exemplary embodiments are not meant to limit the present application in any way. Furthermore, the features in the embodiments of the present application may be combined with each other without conflict. In different figures, identical components are denoted by identical reference numerals and other components are omitted for the sake of brevity, but this does not indicate that other components may not be included. It should be understood that the dimensions, proportions and numbers of elements in the drawings are not intended to limit the present application.
As shown in fig. 1 and 2, a coal seam water injection wetting method according to an embodiment of the present application uses a coal seam water injection wetting apparatus disposed on a working surface 20 of a coal seam 2 to water and wet the coal seam 2, wherein the coal seam water injection wetting apparatus includes a water injection apparatus 3 and a mechanical wave resonance apparatus 4 disposed on two boreholes 21 spaced apart from each other by a set distance on the working surface 20, and the coal seam water injection wetting method includes the following steps: step 1, drilling a borehole 21 on an operation surface 20, pre-pumping gas, and plugging the borehole 21 when the gas pressure and the gas content in a coal seam 2 are reduced to a preset value; step 2, measuring the natural vibration frequency of the coal bed 2 after pre-pumping gas; step 3, arranging at least one coal seam water injection wetting device on the working surface 20; and 4, adjusting the frequency of the mechanical wave resonance device 4 to enable the coal seam 2 to generate natural vibration, and simultaneously opening the water injection device 3 to perform water injection wetting on the coal seam 2.
In the related technology, a large amount of coal dust is generated during coal mining, so that the health of personnel is threatened, accidents such as coal dust explosion and the like can be induced, and the safety production of a mine is seriously threatened. Coal seam water injection is one of important measures for dust prevention and dust suppression of coal rock working faces. However, the gas in the coal can seriously interfere with the water injection wetting effect: the method comprises the following steps that firstly, most of gas in a coal seam exists in coal pores in an adsorption mode, a gas adsorption film is formed on the surface of coal, and the wetting of water on the surface of the coal is further prevented; secondly, gas molecules and water molecules form competitive adsorption, water molecule adsorption sites are occupied, and the water solution adsorption capacity is reduced; and thirdly, the gas pressure can prevent the invasion of the aqueous solution and further reduce the wetting capacity of the aqueous solution.
Therefore, the coal seam water injection wetting method can realize high-pressure water injection under the condition of the natural vibration of the coal seam 2 by matching the water injection device 3 with the mechanical wave resonance device 4, can generate more pore cracks in the coal seam 2, is favorable for water permeation and adsorption, and improves the water injection wetting effect of the coal seam 2.
By drilling the drilling hole 21 on the working face 20 of the coal seam 2 and pre-pumping gas from the coal seam 2 through the drilling hole 21, the gas pressure and the gas content in the coal seam 2 are reduced to a predetermined value, for example, the gas pressure is reduced to below 0.74MPa, and the gas content is reduced to below 8 m/t, so that water permeation and adsorption can be promoted to a certain extent.
In addition, the coal seam water injection wetting device comprises a water injection device 3 and a mechanical wave resonance device 4, two drill holes 21 with a set distance are selected on the working surface 20, for example, the distance between the two drill holes 21 is 8-10 meters, the water injection device 3 is arranged on one drill hole 21, the mechanical wave resonance device 4 is arranged on the other drill hole 21, the frequency of the mechanical wave resonance device 4 is adjusted to be consistent with the natural vibration frequency of the coal seam 2, the coal seam 2 generates natural vibration under the excitation of the mechanical wave resonance device 4, more porous cracks are generated in the coal seam 2, the water injection device 3 injects water into the drill holes 21 under the condition of the natural vibration of the coal seam 2, the water permeation and adsorption are facilitated, and the water injection wetting effect on the coal seam 2 can be improved.
According to an embodiment of the present application, before measuring the natural frequency of the coal seam 2, the coal seam 2 after being subjected to the pre-gas extraction treatment is sampled and made into a coal sample, for example, the size of the coal sample is 7 × 10cm, the coal sample is uniform in texture, and then the natural frequency of the coal sample is measured by using a coal rock natural frequency measuring device, and the natural frequency of the coal sample can represent the natural frequency of the coal seam 2.
According to an embodiment of the present application, the water injection device 3 includes a water injection line 31, a high pressure water pump 35 and a water tank 36, wherein the water injection line 31 is inserted into the borehole 21, the water injection line 31 is communicated with the water tank 36 through a high pressure water pipe 34, the high pressure water pump 35 is disposed on the high pressure water pipe 35 for pumping water in the water tank 36 into the borehole 21 through the water injection line 31, and as an example, a pressure gauge 32 and a valve 33 are further disposed on the high pressure water pipe 35 between the high pressure water pump 35 and the water injection line 35.
According to an embodiment of the present application, the mechanical wave resonator 4 includes a mechanical wave device 41, a power amplifier 42, and a signal generator 43, where the mechanical wave device 41 is a prior art, and no further description is given to the mechanism and the working mechanism of the mechanical wave device, the mechanical wave device 41 is disposed on the borehole 21, the power amplifier 42 amplifies the signal input by the signal generator 43 into the mechanical wave device 41, and the frequency of the mechanical wave device 41 is adjusted to be consistent with the frequency of the measured coal sample, so that the coal seam 2 can generate self-vibration, further more pore fractures are generated in the coal seam 2, and water permeation and adsorption are facilitated.
Optionally, the coal seam water injection wetting device is arranged on the working face 20 at intervals of 8-10 meters, so that the working efficiency can be improved.
According to the wetting method of coal seam water injection provided by the application, through the cooperation of the mechanical wave resonance device and the water injection device, high-pressure water injection can be realized under the condition of coal seam natural vibration, more pore cracks can be generated in the coal seam, the wetting method of coal seam water injection is favorable for water permeation and adsorption, and the wetting effect of coal seam water injection is improved.
Although embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A coal seam water injection wetting method based on mechanical wave resonance is characterized in that a coal seam water injection wetting device arranged on an operation surface of a coal seam is adopted to conduct water injection wetting on the coal seam, the coal seam water injection wetting device comprises a water injection device and a mechanical wave resonance device which are arranged on two drill holes which are arranged on the operation surface and are separated by a set distance, and the coal seam water injection wetting method comprises the following steps:
step 1, drilling the drill hole on the working surface, pre-pumping gas, and plugging the drill hole when the pressure and the content of the gas in the coal seam are reduced to preset values;
step 2, measuring the natural vibration frequency of the coal seam after pre-gas extraction;
step 3, arranging at least one coal seam water injection wetting device on the working surface;
and 4, adjusting the frequency of the mechanical wave resonance device to enable the coal seam to generate natural vibration, and simultaneously opening the water injection device to perform water injection wetting on the coal seam.
2. The method for wetting coal seam water injection based on mechanical wave resonance as claimed in claim 1,
and when gas is pre-extracted in the step 1, stopping gas extraction and plugging the drilled hole when the gas pressure in the coal seam is reduced to 0.74MPa and the gas content is reduced to 8m year/t.
3. The method for wetting coal seam water injection based on mechanical wave resonance as claimed in claim 2,
and (3) sampling the coal seam subjected to gas pre-extraction and preparing a coal sample before measuring the natural vibration frequency of the coal seam in the step (2).
4. The method for wetting coal seam water injection based on mechanical wave resonance as claimed in claim 3,
and 2, when the natural vibration frequency of the coal seam is measured in the step 2, measuring the natural vibration frequency of the coal sample by using a coal rock natural vibration frequency testing device to represent the natural vibration frequency of the coal seam after pre-gas extraction.
5. The method for wetting coal seam water injection based on mechanical wave resonance as claimed in claim 4,
and (3) when the coal seam water injection wetting device is arranged, selecting two drill holes with a distance of 8-10 meters on the working surface, wherein the water injection device is arranged on one drill hole, and the mechanical wave resonance device is arranged on the other drill hole.
6. The method for wetting coal seam water injection based on mechanical wave resonance as claimed in claim 5,
the water injection device comprises a water injection pipeline, a high-pressure water pump and a water tank, wherein the water injection pipeline extends into the drill hole.
7. The method for wetting coal seam water injection based on mechanical wave resonance as claimed in claim 6,
the water injection device also comprises a pressure gauge and a valve.
8. The method for wetting coal seam water injection based on mechanical wave resonance as claimed in claim 7,
the mechanical wave resonance device comprises a mechanical wave device, a power amplifier and a signal generator.
9. The method for wetting coal seam water injection based on mechanical wave resonance as claimed in claim 8,
and (4) when the frequency of the mechanical wave resonance device is adjusted in the step (4), enabling the frequency of the mechanical wave resonance device to be consistent with the natural vibration frequency of the coal sample.
10. The method for wetting coal seam water injection based on mechanical wave resonance as claimed in claim 9,
and a plurality of coal seam water injection wetting devices are arranged on the working face at intervals of 8-10 meters.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210058736.9A CN114320432B (en) | 2022-01-19 | 2022-01-19 | Coal seam water injection wetting method based on mechanical wave resonance |
| LU502620A LU502620B1 (en) | 2022-01-19 | 2022-08-02 | Coal seam water injection wetting method based on mechanical wave resonance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210058736.9A CN114320432B (en) | 2022-01-19 | 2022-01-19 | Coal seam water injection wetting method based on mechanical wave resonance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114320432A true CN114320432A (en) | 2022-04-12 |
| CN114320432B CN114320432B (en) | 2023-06-13 |
Family
ID=81029580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210058736.9A Active CN114320432B (en) | 2022-01-19 | 2022-01-19 | Coal seam water injection wetting method based on mechanical wave resonance |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114320432B (en) |
| LU (1) | LU502620B1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2067181C1 (en) * | 1992-01-16 | 1996-09-27 | Научно-производственная фьючерская фирма "Геоэнергия" | Method for decrease of gas dynamic activity of outburst-prone seams |
| CN102889094A (en) * | 2011-07-20 | 2013-01-23 | 平安煤矿瓦斯治理国家工程研究中心有限责任公司 | Coal seam water injection system |
| CN106703871A (en) * | 2017-02-06 | 2017-05-24 | 华北科技学院 | Method of using high-pressure water injection to prevent and treat gas coal dust |
| US20170146679A1 (en) * | 2015-11-24 | 2017-05-25 | Shandong University Of Science And Technology | Test apparatus and a test method for the wetted perimeter of coal seam water injection |
-
2022
- 2022-01-19 CN CN202210058736.9A patent/CN114320432B/en active Active
- 2022-08-02 LU LU502620A patent/LU502620B1/en active IP Right Grant
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2067181C1 (en) * | 1992-01-16 | 1996-09-27 | Научно-производственная фьючерская фирма "Геоэнергия" | Method for decrease of gas dynamic activity of outburst-prone seams |
| CN102889094A (en) * | 2011-07-20 | 2013-01-23 | 平安煤矿瓦斯治理国家工程研究中心有限责任公司 | Coal seam water injection system |
| US20170146679A1 (en) * | 2015-11-24 | 2017-05-25 | Shandong University Of Science And Technology | Test apparatus and a test method for the wetted perimeter of coal seam water injection |
| CN106703871A (en) * | 2017-02-06 | 2017-05-24 | 华北科技学院 | Method of using high-pressure water injection to prevent and treat gas coal dust |
Non-Patent Citations (1)
| Title |
|---|
| 贾方旭 * |
Also Published As
| Publication number | Publication date |
|---|---|
| LU502620B1 (en) | 2023-02-02 |
| CN114320432B (en) | 2023-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Song et al. | Fracturing with carbon dioxide: from microscopic mechanism to reservoir application | |
| WO2019242191A1 (en) | Hydraulic cutting seam and multistage combustion shock wave combined coal-fracturing gas extraction method | |
| CN104632174A (en) | Coal seam liquid carbon dioxide fracturing device and method | |
| CN103233768B (en) | Horizontal-drilling staged-fracturing pressure relief method for underground coal bed | |
| Zhang et al. | A review of experimental apparatus for supercritical CO2 fracturing of shale | |
| Yang et al. | Environmentally friendly techniques for high gas content thick coal seam stimulation─ multi-discharge CO2 fracturing system | |
| CN109838218B (en) | Experimental device and method for simulating multi-section fractured horizontal gas well stuffy well post-mining | |
| CN204419145U (en) | Coal seam liquid carbon dioxide fracturing device | |
| CN104481462A (en) | Coal-bed gas aging well production capacity increasing method | |
| CN113216921B (en) | Shock wave energy optimization method for electric pulse pretreatment before fracturing of tight reservoir | |
| CN105201461A (en) | Multistage sand jet perforation and fracture combined operation method adopting coiled tubing and bottom packer | |
| CN112664258A (en) | 3-111 gas efficient extraction method capable of preventing rock burst | |
| US20140262285A1 (en) | Methods for fraccing oil and gas wells | |
| CN113216962A (en) | Synergistic permeability-increasing desorption-promoting experimental system and method for ultrasonic-activated fracturing fluid | |
| CN114320432A (en) | Coal seam water injection wetting method based on mechanical wave resonance | |
| CN108959724B (en) | Method for designing acid damage process parameters of compact sandstone reservoir | |
| CN112304842B (en) | Shale oil CO2/N2Alternating displacement injection quantity simulation analysis method | |
| CN204200217U (en) | One protected against explosion flowing bottomhole pressure (FBHP) testing arrangement | |
| RU2351751C2 (en) | Method of improving hydro-dynamic connection of borehole with pay-out bed | |
| Madyarov et al. | Understanding the impact of completion designs on multi-stage fracturing via block test experiments | |
| CA2928816C (en) | Method for extracting methane from coal beds and from penetrating rock enclosing a coal bed | |
| CN110805438A (en) | Method for determining critical desorption pressure of coal bed gas | |
| WO2021238055A1 (en) | Modification device for natural gas hydrate resonance reservoir | |
| CN113466087A (en) | Method for analyzing influence factors of sodium cellulose viscosity in capsule-mucus hole packer | |
| CN212296319U (en) | Reforming device for natural gas hydrate resonance reservoir |
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 |