Document Type
Journal Article
Publication Title
ACS Omega
Volume
7
Issue
48
First Page
43847
Last Page
43855
Publisher
ACS
School
Centre for Sustainable Energy and Resources
RAS ID
54034
Funders
National Natural Science Foundation of China [grant nos. 42072193, 41872176] and the Natural Science Foundation of Henan Province [grant no. 222300420173]
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 %.
DOI
10.1021/acsomega.2c05001
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Comments
Yu, S., Su, X., Song, J., Wang, Q., & You, Z. (2022). The hole sealing technology of solid-liquid materials with three pluggings and two injections for gas extraction hole in the coal mine. ACS omega, 7(48), 43847-43855. https://doi.org/10.1021/acsomega.2c05001