Gas extraction method through drilling along coal seam on basis of extraction pipeline valve control

A technology for drainage drilling and gas drainage, which is used in gas discharge, mining equipment, earthwork drilling, etc., can solve the problems of uneven and inefficient gas drainage along the coal seam, and achieve uniform and efficient drainage Effect

Active Publication Date: 2020-01-14
NORTH CHINA INST OF SCI & TECH
9 Cites 2 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the current problem of uneven and inefficient gas extraction along the coal seam, and to provide a ...
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Method used

B. adjust the extraction pipeline control valve 7 close to the stop production line 8 positions, by adjusting the extraction pipeline control valve 7, reduce its extraction negative pressure, and adjust the extraction pipe adjacent to the cut eye 2 positions simultaneously Road control valve 7, so that the drainage negative pressure reduced in the drainage pipeline near the stop production line 8 is distributed to the drainage pipeline near the cut-off hole 2, so as to increase the drainage negative pressure in the drainage pipeline. increase the gas drainage flow rate, so that the drainage effect at the 2 locations adjacent to the cut hole can reach the national standard.
C. along with coal mining face 1 advances, continue to regulate and control the control valve of corresponding area according to above-mentioned method, by turning down the extraction pipeline control valve 7 near stop production line 8 positions, turn up The drainage pipeline control valve 7 near the cut-off hole 2 can improve the drainage flow rate of the drainage pipeline near the cut-off hole 2, and the drainage pipeline near the cut-off line 8 will not affect the national recommended drainage. On the basis of the mining effect, the extraction negative pressure is appropriately reduced; finally, the extraction effect of each extraction borehole in the coal seam can just meet the national...
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Abstract

The invention discloses a gas extraction method through drilling along a coal seam on the basis of extraction pipeline valve control. The method comprises the following steps that 1) gas along the coal seam is uniformly extracted from an angle of the extraction drilling arrangement in an extraction process, an air intake roadway and an air return roadway start to be tunneled from the position of astopping line, along with tunneling of the roadways, extraction drilling holes are sequentially arranged on the air inlet roadway side, when tunneling is advanced to the position of an open-off cut,the extraction drilling arrangement is ended, an extraction valve adjacent to the position of the stopping line is adjusted down, an extraction valve adjacent to the position of the open-off cut is adjusted up, more negative pressure is distributed to the extraction drilling holes adjacent to the open-off cut, and an extraction flow in the extraction drilling holes adjacent to the open-off cut position is increased; and 2) the gas along the coal seam is efficiently extracted according to the pressure distribution rule on the ore and the permeability coefficient of the coal seam, valves, adjacent to a working face area, of a pressure relief area and valves of a pressurization area are closed, valves, adjacent to the pressurization area, of the pressure relief area are opened all, and the purpose of efficient gas extraction is achieved.

Application Domain

Gas removal

Technology Topic

CoalDrill hole +3

Image

  • Gas extraction method through drilling along coal seam on basis of extraction pipeline valve control
  • Gas extraction method through drilling along coal seam on basis of extraction pipeline valve control

Examples

  • Experimental program(1)

Example Embodiment

[0023] The specific implementation steps of the gas drainage method for drilling along the coal seam based on the valve control of the drainage pipeline in the present invention are as follows:
[0024] 1. From the perspective of the arrangement of the drainage holes in the extraction process, the gas is uniformly drained along the coal seam
[0025] a. Start to excavate the air inlet roadway 3 and the return air roadway 9 from the position of the coal seam stop line 8. As the excavation face advances, arrange the extraction holes and carry out extraction. 2, the drainage drilling arrangement is completed.
[0026] b. Adjust the control valve 7 of the extraction pipeline near the stop line 8, reduce the negative extraction pressure by adjusting the control valve 7 of the extraction pipeline, and at the same time adjust the control valve of the extraction pipeline near the position of the opening 2 7. Distribute the reduced extraction negative pressure of the extraction pipeline near the production stop line 8 to the extraction pipeline adjacent to the incision hole 2 to increase the negative extraction pressure in the extraction pipeline. The large gas drainage flow makes the drainage effect near the two incisions reach the national standard.
[0027] c. As the coal mining face 1 moves forward, continue to adjust the control valve in the corresponding area according to the above method, by reducing the control valve 7 of the extraction pipeline near the stop line 8, and increasing the value near the cutting The control valve 7 of the extraction pipeline at the position of eye 2 can improve the extraction flow of the extraction pipeline at the position of the opening incision 2, and the extraction pipeline at the position of 8 near the stop line does not affect the basis of the extraction effect recommended by the state. Appropriately reduce the negative drainage pressure; finally, the drainage effect of each drainage hole in the coal seam can just meet the national recommended standard, and achieve uniform gas drainage.
[0028] 2. Efficient drainage of gas along coal seam from the perspective of mine pressure distribution law and coal seam permeability coefficient
[0029] a. When the mining of the coal seam starts after the tunnel excavation is completed, the distribution law of the mine pressure and the gas permeability coefficient of the coal seam will have an impact on the extraction efficiency of the drainage hole.
[0030] b. The stress distribution of the coal seam near the working face is from the position of the cutting hole 2 to the position of the stop line, respectively: pressure relief zone 4, booster zone 5, and voltage stabilization zone 6. The stress on the coal seam in the pressure relief zone 4 is less than the original stress of the coal seam, especially in the area near the working face of the pressure relief zone 4: the coal body is soft, with many pores and fissures, which is easy to cause air leakage, but the gas permeability is good; while the pressurized zone 5 The stress of the inner coal seam is larger than that of the original coal seam, and the pores and cracks are less, but the permeability is deteriorated. These two areas will reduce the gas extraction efficiency; while the stress on the 6th coal seam in the pressure stabilization zone is the original coal seam stress, which has no effect on the gas extraction efficiency.
[0031] c. For the above problems, it is necessary to improve the gas drainage efficiency by controlling the drainage pipeline in the corresponding area. According to the distribution law of the stress on the coal seam on the working face, it is obtained that the pressure relief area 4 is adjacent to the booster area 5. In a small area, the softness of the coal body is low, it is not easy to leak air, and the coal seam has good gas permeability, which is beneficial to improve the gas drainage concentration and the gas drainage flow.
[0032] d. In order to solve the problem of low gas extraction efficiency in the pressure relief area 4 and the booster area 5 near the working face, the method of controlling the valve 7 of the extraction pipeline is adopted, that is, the pressure relief area 4 is closed for the adjacent work. The valve in the surface area and the valve in the booster area 5, fully open the valve in the pressure relief area 4 adjacent to the pressure increase area 5 area, and the valve of the extraction pipeline in the pressure stabilization area 6 does not need to be adjusted; in this way, the pressure relief area 4 is close to work. The extraction negative pressure of the extraction pipeline in the surface area and the extraction pipeline in the pressurized area 5 is all concentrated in the extraction pipeline in the pressure relief area 4 adjacent to the pressurized area 5 area; if the effect of closing the extraction is low, Fully open the drainage effect is good, and finally achieve efficient gas drainage.
[0033] e. With the advancement of the coal mining face 1, the stress on the coal seam also changes, but the distribution law of the stress on the coal seam is fixed, as long as the valve 7 of the extraction pipeline is continuously operated according to the above method Management and control can realize the efficient extraction of the whole process.
[0034] The two methods of uniform gas drainage along the coal seam from the perspective of the arrangement of the drainage holes in the drainage process and efficient gas drainage along the coal seam from the perspective of the stress distribution law of the coal seam and the gas permeability coefficient of the coal seam are combined. At the same time, it is applied to gas extraction along the coal seam to achieve uniform and efficient gas drainage along the coal seam.

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