METHOD FOR SIMULTANEOUSLY MEASURING GAS PRESSURES OF CLOSE DISTANCE COAL SEAM GROUP

Title:

METHOD FOR SIMULTANEOUSLY MEASURING GAS PRESSURES OF CLOSE DISTANCE COAL SEAM GROUP

Document Type and Number:

WIPO Patent Application WO/2023/178760

Kind Code:

A1

Abstract:

The present invention provides a method for simultaneously measuring gas pressures of a close distance coal seam group, comprising the following steps: (1) constructing a downward inclined pressure measuring borehole; (2) lowering a first coal seam pressure measuring pipe, and lowering a baffle and a polyurethane plugging material when a pipe head reaches the lowest coal seam; and after the plugging material is solidified, installing a gas pressure gauge; (3) lowering a second coal seam pressure measuring pipe, and lowering a baffle and a polyurethane plugging material when a pipe head reaches the second coal seam; and after the plugging material is solidified, installing a gas pressure gauge; (4) lowering an n-th coal seam pressure measuring pipe, and lowering a baffle and a polyurethane plugging material when a pipe head reaches the n-th coal seam; and after the plugging material is solidified, installing a gas pressure gauge; (5) injecting a high-water quick-setting material into the borehole; and (6) connecting the gas pressure gauges by means of optical fibers, and connecting the gas pressure gauges to a ground control system. According to the present invention, by constructing only one pressure measuring borehole, pressures of two or more adjacent coal seams of a coal seam group can be simultaneously tested, and therefore, the present invention has the advantages of cost saving and accurate testing.

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Inventors:

LI SHAOBO (CN)
REN QIHAN (CN)
WANG LEI (CN)
NIU XINGANG (CN)
ZHU CHUANQI (CN)
CHEN LIPENG (CN)
ZHANG YU (CN)

Application Number:

PCT/CN2022/086998

Publication Date:

September 28, 2023

Filing Date:

April 15, 2022

Export Citation:

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Assignee:

UNIV ANHUI SCI & TECHNOLOGY (CN)
CHONGQING RESEARCH INSTITUTE CO LTD OF CHINA COAL TECH ENGINEERING GROUP (CN)

International Classes:

E21B47/06; E21B33/13

Foreign References:

CN109709297A	2019-05-03
CN112682092A	2021-04-20
CN106496517A	2017-03-15
CN101033121A	2007-09-12
CN104973835A	2015-10-14
CN108798760A	2018-11-13
CN109399994A	2019-03-01
CN104628414A	2015-05-20
US4010800A	1977-03-08

Other References:

SUN CHAOLU: "Research on Optimization of High Water Quick Setting Material in Grouting and Hole Sealing of Gas Drainage", ZHONGZHOU COAL, vol. 241, no. 1, 25 January 2016 (2016-01-25), XP093094327, ISSN: 1003-0506, DOI: 10.19389/j.cnki.1003-0506.2016.01.009

Attorney, Agent or Firm:

HEFEI XINGDONG INTELLECTUAL PROPERTY AGENCY CO., LTD (CN)

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