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High-efficiency drainage of coal roadway strip gas and regional outburst elimination method by segmental fracturing with long boreholes along the floor

A technology of layered drilling and long drilling, which is used in gas discharge, earthwork drilling, wellbore/well components, etc., can solve the problem of tight coal mining continuity, poor fracturing and drainage effects, and many outburst prevention measures. and other problems, to achieve the effect of rapid regional burst elimination, good pressure relief and anti-reflection effect, and short extraction time to meet the standard.

Active Publication Date: 2019-06-04
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Technical problem: The purpose of this invention is to solve the problems existing in the prior art, and to provide a method for segmentally and step-by-step fracturing of floor-by-bed long drilling holes, efficient drainage of coal roadway strip gas and regional outburst elimination method. Dangerous coal seam floor Drilling holes in the hard rock formation The bottom plate is drilled along the bedding rock, and the fracturing is carried out section by section from the inside to the outside. The cracks pass from the rock formation to the coal seam, so that the coal seam near the roadway can achieve fracturing, pressure relief, permeability enhancement and high-efficiency drainage. and outburst elimination, fundamentally solve the problems of gas drainage in coal roadways in outburst coal seams and regional outburst prevention measures with many links, large engineering volume, long construction period, low efficiency, poor fracturing and drainage effects, potential safety hazards and coal mining problems. Continuing tension and other issues

Method used

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  • High-efficiency drainage of coal roadway strip gas and regional outburst elimination method by segmental fracturing with long boreholes along the floor
  • High-efficiency drainage of coal roadway strip gas and regional outburst elimination method by segmental fracturing with long boreholes along the floor
  • High-efficiency drainage of coal roadway strip gas and regional outburst elimination method by segmental fracturing with long boreholes along the floor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 and figure 2 Shown: regional outburst elimination and drainage of single roadway excavation, using I-type bedding floor long drilling holes segmented step by step fracturing to efficiently drain coal roadway strip gas for regional outburst elimination:

[0039] In the existing roadway 3, in the hard floor rock formation 2 near the coal seam 1 where there is a risk of outburst, the I-type floor bedding borehole 5 is drilled along the direction of the coal seam roadway 4 to be excavated.

[0040] After the drilling is completed, the fracturing water pipe 9 equipped with the movable and reusable double-capsule split hole sealer 7 is placed in the layer-by-layer drilling 5 of the bottom floor, and the double-capsule split hole sealer 7 is extended to the bottom floor along the layer Drill the bottom of hole 5.

[0041] Turn on the high-pressure water pump of the hydraulic fracturing system, adjust the water injection pressure, inject water into the capsu...

Embodiment 2

[0045] Such as image 3 As shown, using the regional outburst reduction and drainage of the roadway and the cut hole of the gob-side entry retaining working face, that is, the L-shaped bedding floor long drilling hole is staged and staged to efficiently drain the coal roadway and the cut hole strip gas, Perform area deburring:

[0046] Firstly drill the I-type bedding floor long hole 5 from the roadway 3, and then complete the L-shaped bedding floor drilling 5 at the corresponding position of the cut hole, the distance between the hole bottom and the gob-side entry 11 is not more than 15m; then start from the bottom of the hole Carry out stage-by-stage fracturing on the L-shaped bedding floor drilling holes, and perform gas drainage after fracturing, the same parts as in Example 1 are omitted;

[0047] After the stage-by-stage fracturing is completed, use the L-shaped floor drilling 5 along the bedding to efficiently drain the fracturing anti-reflection area segment by segmen...

Embodiment 3

[0050] Such as Figure 4 Shown: Outburst elimination and drainage in the mining face roadway and cut hole area of ​​double roadway excavation, using L+I type bedding floor long drilling hole segmented step by step fracturing to efficiently drain coal roadway and cut hole strip gas , perform regional deburring:

[0051] In the existing roadway 3, use two drilling rigs to drill into the hard bottom plate of the coal seam roadway 4 to be excavated respectively. The hole bottom spacing of the holes 5 is not more than 15m; then the I-type and L-type bedding floor drilling holes 5 are subjected to stage-by-stage fracturing from the bottom of the holes, and the gas drainage is performed after the fracturing, which is the same as in Example 1 Partially omitted;

[0052] After the stage-by-stage fracturing is completed, use the I-type and L-type bottom plate along-bed drilling holes 5 to efficiently drain the fracturing anti-reflection area step by step or the entire segment; judge w...

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Abstract

The present invention applies to projects such as regional outburst elimination for coal roadway driving or for coal extraction, and discloses a method for efficient gas drainage in coal roadway strips and regional outburst elimination by performing staged fracturing with long borehole floor beddings. Staged fracturing is performed by drilling a floor bedding borehole (5) into a hard floor stratum (2) of a coal seam (1) having outburst risk in an existing roadway (3) along a direction of a coal seam roadway (4) to be driven, and regional outburst elimination on coal road strips is performed by stage-by-stage drainage or drainage in a whole stage by means of fractured fissures; and it is determined, according to a drainage amount, whether drainage has reached a set standard; if so, a coal seam borehole (6) is constructed along boundaries on both sides of the coal seam roadway within a range of effective outburst prevention measures, an effectiveness test on the regional outburst prevention measures and further drainage are performed; and then coal seam roadway driving is performed while enforcing a rule of regional verifying measures and partial four-in-one measures. The present invention has advantages such as replacement of roadways with boreholes, a low number of boreholes, a wide fracturing range, a low degree of stress concentration in coal bodies surrounding fracturing regions, effective pressure relief, a short period of time in reaching a drainage standard, good applicability in coal seam parameters, and a wide range of applications.

Description

technical field [0001] The invention relates to a method for strip gas drainage and regional outburst elimination, in particular to a method for long-distance, high-efficiency pressure relief, anti-reflection, drainage, and regional outburst elimination of coal seams. Efficient drainage of coal roadway strip gas and regional outburst elimination method. Background technique [0002] High stress and high gas seriously threaten the underground safety of coal mines. It is necessary to implement gas drainage and regional outburst reduction measures before coal roadway excavation to prevent coal and gas outburst and safely excavate roadway. The outburst coal seams are mostly soft and low-permeability coal seams, and gas drainage is difficult. At present, the strip gas pre-pumping of coal roadways mainly adopts the pre-pumping of densely penetrated layers in the top (or bottom) slate roadway, and the partial layer-penetrated hydraulic measures (punching, slotting, fracturing) of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B43/26
CPCE21B43/261E21F7/00
Inventor 王恩元邱黎明李忠辉欧建春
Owner CHINA UNIV OF MINING & TECH
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