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]

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

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

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

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