Research on effective drainage radius and rational borehole spacing of parallel boreholes

SANG Naiwen; YANG Shengqiang; SONG Yawei

doi:10.13272/j.issn.1671-251x.2019010048

Volume 45 Issue 6

Turn off MathJax

Article Contents

Article Navigation > Journal of Mine Automation > 2019 > 45(6): 58-62

SANG Naiwen, YANG Shengqiang, SONG Yawei. Research on effective drainage radius and rational borehole spacing of parallel boreholes[J]. Industry and Mine Automation, 2019, 45(6): 58-62. doi: 10.13272/j.issn.1671-251x.2019010048

Citation:

SANG Naiwen, YANG Shengqiang, SONG Yawei. Research on effective drainage radius and rational borehole spacing of parallel boreholes[J]. Industry and Mine Automation, 2019, 45(6): 58-62. doi: 10.13272/j.issn.1671-251x.2019010048

Citation:

PDF( 885 KB)

Research on effective drainage radius and rational borehole spacing of parallel boreholes

doi: 10.13272/j.issn.1671-251x.2019010048

SANG Naiwen^{1, 2, 3},
YANG Shengqiang^{1, 2, 3},
SONG Yawei^{1, 2, 3}

1.
School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
2.
Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221116, China
3.
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China

Publish Date: 2019-06-20

Abstract

Abstract

In order to determine rational borehole spacing of parallel boreholes for gas drainage, a fluid-solid coupling model of gas drainage was established by deducing gas migration equation of coal seam, deformation equation of coal and rock, and coupling equation of seepage field and stress field. According to actual geological conditions of 21219 working face in a mine, variation law of gas pressure and effective drainage radius under influence of drainage superposition effect between parallel boreholes were numerically simulated by COMSOL Multiphysics software, and rational borehole spacing was obtained by combining with effective drainage radius of borehole. The numerical simulation results show that gas pressure of coal body after drainage increases with the increase of borehole spacing. As the distance between coal body and borehole decreases, gas pressure of coal body decreases slowly at first and then decreases rapidly. With the increase of drainage time, gas pressure decreases continuously and effective drainage radius increases. The field application results verify rationality of borehole spacing arrangement.
- coal mining,
- gas drainage,
- parallel borehole drainage,
- effective drainage radius,
- drainage superposition effect,
- borehole spacing