Directional long drilling construction method and large-area regionalization arrangement method for broken, soft and complex-structure coal seam

A construction method and long drilling technology, which are applied in the field of gas drainage in complex coal seams with crushed and soft structures, can solve the problems of high construction cost of rock roadway, inability to realize large-area regionalized efficient drainage, short drilling coverage and short service time, etc. problem, to achieve the effect of efficient extraction

Active Publication Date: 2022-03-18
SHANXI JINMEI GRP TECH RESEACH INST
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AI Technical Summary

Problems solved by technology

The above-mentioned technologies mainly have problems such as high cost of rock roadway construction, short effective drainage length of the borehole (about 100 meters), short coverage of the borehole and short service time, and cannot realize large-area, regionalized and efficient drainage of coal seams with complex soft and broken structures.

Method used

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  • Directional long drilling construction method and large-area regionalization arrangement method for broken, soft and complex-structure coal seam
  • Directional long drilling construction method and large-area regionalization arrangement method for broken, soft and complex-structure coal seam
  • Directional long drilling construction method and large-area regionalization arrangement method for broken, soft and complex-structure coal seam

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Embodiment Construction

[0038] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] This embodiment includes coal seams with soft and complex structures (such as figure 1 ) of directional long borehole design, construction and long borehole regional layout.

[0040] (1) For the design and construction of a single group of directional long boreholes, a complete set of long borehole construction methods of "direction detection - pressure relief and antireflection - large diameter protective holes" shall be adopted.

[0041] Drilling design aspects:

[0042] A single group of boreholes ...

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Abstract

The invention provides a directional long drilling construction method and a large-area regionalization arrangement method for a broken and soft coal seam with a complex structure, belongs to the technical field of gas extraction of the broken and soft coal seam with the complex structure, and mainly solves the problem that large-area long-distance extraction of the broken and soft coal seam with the complex structure cannot be realized at present. And the gas extraction efficiency of the broken soft complex coal seam is improved. According to the technical scheme, high-power large-torque automatic directional drilling equipment is selected, a proper drilling tool, a proper punching tool, a proper hole protecting tool and the like are matched, a coal seam trend probing hole (also serving as an extraction hole) and a pressure relief anti-reflection extraction main hole are constructed in a regional coal seam, and a large-diameter screen pipe protection hole is implemented; and large-area long-distance drill hole arrangement and extraction of the broken and soft coal seam with the complex structure are achieved.

Description

technical field [0001] The invention belongs to the technical field of gas drainage of coal seams with broken soft structures and complex structures, and specifically discloses a directional long drilling construction method and a large-area regional layout method for broken soft and complex coal seams. Background technique [0002] Fragile soft and structurally complex coal seams refer to coal seams with a hardness coefficient f value of 0.3 to 0.8 and soft and hard stratifications, namely: coal seams with soft stratifications with f values ​​of 0.3 to 0.5 and hard stratifications with f values ​​of 0.5 to 0.8 ; and in addition to structures such as collapse columns, folds, and faults above 3 meters in the coal seam, there are also small structures below 3 meters. The overall occurrence of the coal seam is complex, and the gas content of the coal seam is 8m 3 / t or more, it will affect the safe recovery of the mine working face. Drilling in this coal seam often involves h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B7/04E21B21/14
CPCE21F7/00E21B7/04E21B21/14Y02E10/10
Inventor 赵学良王德璋都海龙贺光会贾航罗华贵贺敏崔建峰张飞辛宪耀栗海滔
Owner SHANXI JINMEI GRP TECH RESEACH INST
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