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Method for gas drainage and regional outburst elimination of coal roadway strips by staged fracturing and along seam long borehole drilling in floor strata

A technology of layered drilling and long drilling, which is applied in the directions of gas discharge, earthwork drilling, and fluid extraction, can solve problems such as poor fracturing and drainage effects, tight coal mining continuity, and many outburst prevention measures. It achieves the effects of good pressure relief and anti-reflection effect, rapid area relief, and short extraction time.

Active Publication Date: 2017-06-30
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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  • Method for gas drainage and regional outburst elimination of coal roadway strips by staged fracturing and along seam long borehole drilling in floor strata
  • Method for gas drainage and regional outburst elimination of coal roadway strips by staged fracturing and along seam long borehole drilling in floor strata
  • Method for gas drainage and regional outburst elimination of coal roadway strips by staged fracturing and along seam long borehole drilling in floor strata

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 with 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 caps...

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 invention provides a method for gas drainage and regional outburst elimination of coal roadway strips by staged step-by-step fracturing and along seam long borehole drilling in a floor strata. The method is suitable for being applied to coal roadway excavating region outburst elimination, backstoping region outburst elimination and other projects. Along seam long boreholes are drilled in the hard floor strata with outburst-hazard coal seams in an existing roadway along the to-be-excavated coal roadway direction, staged step-by-step fracturing is conducted, fracturing holes are used for segmental drainage or the whole drainage, and outburst elimination is conducted on the coal roadway strips; according to the drainage amount, exhausting and mining standard evaluation is conducted, after exhausting and mining reach the standard, boreholes are drilled in the coal seams at the boundaries, in the range of regions adopting effective outburst prevention measures, on the two sides of the coal roadway, regional outburst prevention measure effect checking is conducted, drainage is then conducted, and coal roadway excavating is conducted when regional checking measures and local four-in-one measures are implemented. The method has the advantages that boreholes replace the roadway, drilling project amount is less, the fracturing range is large, the fracturing region surrounding coal stress concentration degree is low, stress relieving and permeability improving effects are good, exhausting and mining up-to-standard time is short, the coal parameter adaptability is high and the application range is wide.

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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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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