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Rock cross-cut coal uncovering high-pressure hydraulic flushing comprehensive permeability enhancement method

A technology of hydraulic punching and coal removal in Shimen, which is applied in the direction of earthwork drilling, gas discharge, mining fluid, etc., can solve the problem of unsatisfactory anti-permeability effect of coal seam, and achieve the purpose of increasing the flow rate of punching water, punching pressure and increasing Penetration range, the effect of improving the service life

Active Publication Date: 2020-05-26
HUAINAN MINING IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is how to solve the problem of unsatisfactory anti-permeability effect in high-depth and high-gas coal seams

Method used

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  • Rock cross-cut coal uncovering high-pressure hydraulic flushing comprehensive permeability enhancement method
  • Rock cross-cut coal uncovering high-pressure hydraulic flushing comprehensive permeability enhancement method
  • Rock cross-cut coal uncovering high-pressure hydraulic flushing comprehensive permeability enhancement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The comprehensive anti-permeability method of high-pressure hydraulic punching for Shimen unraveling coal is illustrated by using hydraulic punching comprehensive anti-permeability at the -730~-960m contact inclined roadway to uncover the 5-2 coal working face. The 5-2 coal seam A is the coal seam to be uncovered, including The following steps:

[0038] Step S1: Construct an auxiliary roadway 1 above the 5-2 coal seam A, the roof elevation of the roadway is -814m, and the vertical distance from the 5-2 coal seam is 74m; in the auxiliary roadway 1, construct a ￠246mm vertical drilling 2 (hole number is Z1# ), the end point of the vertical borehole 2 is located at a position below 1 meter below the bottom plate of the 5-2 coal seam A; the technological parameters are as follows in Table 1:

[0039]

[0040] Step S2: Use the ￠177.8mm oil casing pipe fixing process to seal the vertical borehole and fix the pipe;

[0041] In this embodiment, large-diameter vertical punch...

Embodiment 2

[0052] In this embodiment, on the basis of Embodiment 1, the specific operation process of step S4 is:

[0053] The first stage, hydrostatic flushing

[0054] From the 1st day to the 16th day, first use static pressure water to punch holes, the punching pressure is kept at 3.5-4Mpa, and each small class punches for 3-4 hours. During the punching process, arrange a special person to observe the head. Punching makes Z1# hole directly connected with C1# hole, water and coal flow are sprayed from C1# hole, and the total water injection volume is 250m 3 , 20 tons of coal were washed out.

[0055] The second stage, high pressure water pressure

[0056] From the 17th shift to the 31st day, the C1# hole is closed, and the water injection pump is used for high-pressure water injection and pressure flushing, and the pressure is controlled below 20Mpa. After fracturing, the Z1# hole is connected with the C2# and C3# holes, and the water and coal flow from C2 #, C3# holes spray out, th...

Embodiment 3

[0065] like Figure 4 As shown, on the basis of Embodiment 2, 180 outburst prevention measures holes have been constructed on the working face; it can be constructed according to actual needs;

[0066] The inspection of gas drainage volume is as follows in Table 4:

[0067]

[0068]

[0069] After the 34th day (press stamping has been completed), the average scalar volume of single hole drainage has reached 0.0148m 3 / min, 100-hole extraction scalar volume 1.48m 3 / min.

[0070] Taking the B coal seam that has been uncovered as an example, the measured gas pressure of B coal in this working face was 1.5MPa, and the gas content was 6.7m3 / t. The volume is 0.0047m3 / min, and the scalar volume of 100-hole drainage is 0.47m3 / min.

[0071] Through comparative analysis, after adopting high-pressure hydraulic punching and anti-permeability measures, the scalar volume of 100-hole drainage in the coal mining face in Shimen increased from 0.47m3 / min to 1.48m3 / min, an increase of...

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Abstract

The invention discloses a rock cross-cut coal uncovering high-pressure hydraulic flushing comprehensive permeability enhancement method. The rock cross-cut coal uncovering high-pressure hydraulic flushing comprehensive permeability enhancement method comprises the steps that an auxiliary roadway is constructed; vertical drilling holes are constructed downward in the auxiliary roadway, and the endpoint of the vertical drilling holes is located under a coal seam floor to be uncovered; the vertical drilling holes are subjected to hole sealing and cementing; three drilling holes are constructed on a driving face of a coal uncovering working face, one of the three drilling holes is a slagging drilling hole penetrating through the vertical drilling holes, the other two drilling holes are located on two sides of the vertical drilling holes respectively, and grouting and hole sealing are performed on the three drilling holes; a pressure flushing system communicates with the vertical drillingholes to carry out water supply pressure flushing; static pressure water flushing and high pressure water injection pressure flushing are adopted sequentially; and after the hydraulic pressure flushing operation is completed, a plurality of outburst prevention measure holes are constructed. The rock cross-cut coal uncovering high-pressure hydraulic flushing comprehensive permeability enhancement method has the beneficial effects that the flushing water flow rate and flushing pressure and penetration enhancement range are increased, by adopting hydraulic flushing measures combining the static pressure water flushing with the high pressure water pressure flushing, the extraction effect of a coal seam with complex geological conditions, deep burial depth, high gas pressure and poor permeability can be effectively improved, and the benefit of permeability enhancement is realized.

Description

technical field [0001] The invention relates to the technical field of coal mine safety production and construction, in particular to a hydraulic punching anti-reflection method. Background technique [0002] Coal and gas outburst means that under the action of pressure, broken coal and a large amount of gas are suddenly ejected from the coal body to the mining space in large quantities, which is extremely destructive. The geological structure of the coal seam in Pansan Mine is complex, the mining depth is large, the gas pressure of the coal seam is high, and the gas permeability of the coal seam is poor, so the gas drainage is difficult and the drainage effect is poor. Therefore, in order to achieve rapid and efficient coal mining in the Shimen coal mining face, the poor gas drainage effect is the main problem that needs to be solved urgently. [0003] The measure of hydraulic punching is to use the rock pillar as a safety barrier, use hydraulic action to release the outbu...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B43/26E21B7/18E21B33/13
CPCE21F7/00E21B43/26E21B7/18E21B33/13
Inventor 陈建董瑞刚董善保陈宿陈勇张盛方亮谢申赵勇朱传记
Owner HUAINAN MINING IND GRP
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