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 ro

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

Example Embodiment

[0037] Example 1,

[0038] Such as figure 1 with figure 2 Shown: the regional outburst elimination and drainage of single-lane excavation, the use of I-type bedding floor long boreholes stepwise fracturing and efficient drainage of coal road strip gas, regional outburst elimination:

[0039] In the existing roadway 3, drill an I-type floor along-the-bed hole 5 in the hard floor rock layer 2 near the coal seam 1 where the outburst danger exists and 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 splitting and sealing device 7 is placed in the bottom plate layered borehole 5, and the double-capsule splitting and sealing device 7 is extended to the bottom plate layering. Drill the bottom of the hole 5.

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

Example Embodiment

[0044] Example 2,

[0045] Such as image 3 As shown, the use of the roadway and the area of ​​the open-cut hole to eliminate the outburst and the drainage of the working face along the goaf, that is, the L-shaped bedding floor long borehole is staged by staged fracturing to efficiently drain the coal roadway and the open-cut strip gas. Perform area elimination:

[0046] First drill the I-shaped bedding floor long borehole 5 from the roadway 3, and then complete the L-shaped bedding floor borehole 5 at the corresponding position of the cut hole. The distance between the hole bottom and the reserved lane 11 along the goaf is not more than 15m; then start from the hole bottom Perform stepwise fracturing on the L-shaped bedding floor borehole, and perform gas drainage after fracturing. The same parts as in Example 1 are omitted;

[0047] After the end of the fracturing stage by stage, use the L-shaped floor drill hole 5 to perform efficient drainage of the fracturing enhancement area s...

Example Embodiment

[0049] Example 3.

[0050] Such as Figure 4 Shown: the area elimination and drainage of the roadway and the open-cut hole in the double-lane tunneling, the use of L+I type bedding floor long boreholes with staged fracturing and high-efficiency gas drainage in the coal roadway and the open-cut strip , Perform regional elimination:

[0051] In the existing roadway 3, two drilling rigs are used to drill the I-type floor in-line drilling 5 and the L-shaped floor in-line drilling 5 into the hard floor of the coal seam to be excavated. The distance between the hole bottoms of the holes 5 is not more than 15m; then the I-type and L-type bedding floor boreholes 5 are fractured in stages from the bottom of the hole, and gas drainage is performed after the fracturing, which is the same as in Example 1. Partly omitted

[0052] After the fracturing is completed stage by stage, use the I-type and L-type floor along-layer boreholes 5 to perform efficient drainage of the fracturing enhancement ...

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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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