Gas extraction technology with L-shaped ground well drilling in mining area

被引：0

作者：

Liu K. ^{[1
]}

Hou C. ^{[2
]}

Jiang Z. ^{[2
]}

Cheng B. ^{[2
]}

Yuan K. ^{[1
]}

Liu C. ^{[3
]}

Li X. ^{[2
]}

机构：

[1] Shaanxi Key Laboratory of Safety and Durability of Concrete Structure, Xijing University, Xi'an, 710123, Shaanxi

[2] Xi'an Research Institute, China Coal Technology and Engineering Group Corp, Xi'an, 710054, Shaanxi

[3] School of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi

来源：

Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2018年 / 35卷 / 06期

关键词：

L" ground drilling; Extraction effect; Extraction technology; Gas; Mining disturbed zone;

D O I：

10.13545/j.cnki.jmse.2018.06.027

中图分类号：

学科分类号：

摘要：

To prevent the occurrence of gas over-limit problem for the purpose of efficient mining, in the fully mechanized coal mining working face in soft coal seam with highly gas and low permeability, a comprehensive study was conducted on the "L" well layout, the design of the well structure, the key technology of construction and the effect of gas extraction, based on the engineering geology and gas extraction conditions of 10 # coal seam at the 1071 working surface of Yangliu coal mine. The results show that the horizontal section of the L-shaped well should be located in the lower part of the overlying fracture zone in the longitudinal direction and effectively connected with the "O" ring in the trans verse direction. The L-shaped well is designed as three-spud structure and the third spud section is the effective extraction part which is constructed with screen completion. MWD, alternating slide drilling and compound drilling, optimizing assembly of drilling tools and other methods for borehole trajectory control were used in constructing horizontal section of the L-shaped well, whose total angular changing rate of the borehole is large and upward section is up to 93°-94°. The casing step-by-step, precise opening, side drilling, and the salvage complete process were used to ensure the successful construction of the multi-branch holes. The blockage of drain hole is the main reason that the pumping effect of "L" well is not satisfactory. The results can provide theoretical basis and technical reference for coal mine gas disaster prevention and control, coal and gas co-mining practices. © 2018, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.

引用

页码：1284 / 1292and1300

共 23 条

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