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Yu S, Su X, Song J, Wang Q, You Z. The Hole Sealing Technology of Solid-Liquid Materials with Three Pluggings and Two Injections for Gas Extraction Hole in the Coal Mine. ACS OMEGA 2022; 7:43847-43855. [PMID: 36506120 PMCID: PMC9730471 DOI: 10.1021/acsomega.2c05001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 10/31/2022] [Indexed: 06/17/2023]
Abstract
The sealing quality of the gas extraction holes determines the extracted gas concentration. Based on this, the paper reveals the basic principle of hole sealing by analyzing the gas leakage mechanism of the borehole. The hole sealing technology of solid-liquid materials with three pluggings and two injections for the gas extraction hole is proposed, and the hole sealing device and material are developed. Through testing the granularity distribution of the solid material, as well as the surface tension and contact angle of the slurry, the hole sealing material that can meet the requirements of accessible, sticky, and anti-deformation is selected. The sealing material enters microcracks and bonds coal rock more easily. First, the solid material is injected for hole sealing. Second, the liquid material can be injected repeatedly to maintain a high concentration for holes with poor sealing and gas concentration attenuation in the late stage of gas extraction. Field tests show that the gas concentration of solid material is 1.3 times that of the conventional material after 30 days of sealing. The liquid material injected after the concentration decline enables the gas extraction concentration to be recovered at 85%.
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Affiliation(s)
- Shiyao Yu
- Institute
of Resources and Environment, Henan Polytechnic
University, Jiaozuo454003, China
- Center for
Sustainable Energy and Resources, Edith
Cowan University, Joondalup, WA6027, Australia
| | - Xianbo Su
- Institute
of Resources and Environment, Henan Polytechnic
University, Jiaozuo454003, China
- Unconventional
Gas Research Institute, Henan Polytechnic
University, Jiaozuo454003, China
- School
of Energy Resources, China University of
Geosciences, Wuhan430074, China
- Collaborative
Innovation Center of Coalbed Methane and Shale Gas for Central Plains
Economic Region, Jiaozuo454003, China
| | - Jinxing Song
- School
of Energy Science and Engineering, Henan
Polytechnic University, Jiaozuo454003, China
- Collaborative
Innovation Center of Coalbed Methane and Shale Gas for Central Plains
Economic Region, Jiaozuo454003, China
| | - Qian Wang
- Institute
of Resources and Environment, Henan Polytechnic
University, Jiaozuo454003, China
| | - Zhenjiang You
- Center for
Sustainable Energy and Resources, Edith
Cowan University, Joondalup, WA6027, Australia
- School of
Chemical Engineering, The University of
Queensland, Brisbane, QLD4072, Australia
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