Citation

Luo Z, Duan Y, Wang X, Zhang X. China Saf. Sci. J. 2022; 32(2): 74-82.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.02.011

PMID

unavailable

Abstract

In order to explore influence of high temperature on sealing performance of mudstone caprocks, three forms of thermal stress generated by gas storage caprocks were theoretically analyzed. Then, based on laboratory tests, mechanical damage degree of mudstone and changes of caprock sealing assessment indicators in high temperature environment were analyzed. The results show that the overall structural performance of mudstone is reduced under high temperature, with 400 ℃ being generally the threshold temperature for its damage under action of periodic thermal stress. High temperature will significantly change the physical sealing characteristics of mudstone caprocks, and when it is around 400 ℃, which is the threshold, sealing ability will be lost. According to empirical research and analysis results of caprocks in a gas reservoir type gas storage, temperature range of target caprock has not exceeded the threshold. It is believed that the mudstone caprock has good sealing performance, and evaluation result can reflect the true situation of mudstone capping. © 2022, Editorial Department of China Safety Science Journal. All rights reserved.

Language: zh