A Study on the Effect of Shale-liquid Reaction on Casing Deformation

doi:10.11885/j.issn.1674-5086.2019.12.23.01

Abstract

Abstract: The casing deformation after fracturing in shale is a serious problem, which has become a bottleneck restricting the development of shale resources. However, the cause of casing deformation is still unclear, and there is no effective prevention and control measures. In this paper, the effect of shale-liquid reaction on casing deformation and its prevention measures were studied by numerical simulation technology, according to the shale structure characteristics and mechanical properties. Results show that the weak deformation occurred because of the intergranular expansion in fractures in the reaction of shale and liquid. Due to the high mechanical strength and elastic modulus of shale, the weak deforamtion of shale will produce a strong force, and the force exerted on the casing will influence the casing safty. The reduction of elastic modulus of cement and the perforation can prevent casing deformation. The research results provide reference value for further understanding the causes of casing deformation and prevention measures.

Key words: shale gas, reaction of shale and liquid, casing deformation, cement ring, prevention measures

CLC Number:

TE257

LI Gao, LI Ze, JIANG Zujun, YU Hao, HE Long. A Study on the Effect of Shale-liquid Reaction on Casing Deformation[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(1): 103-110.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2019.12.23.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2021/V43/I1/103

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