Shale-liquid Interaction and Its Effect on In-situ Stress

doi:10.11885/j.issn.1674-5086.2022.06.29.01

Abstract

Abstract: During drilling and completion in shale formation, shale-liquid interaction between working fluid and shale is inevitable. In order to study the mechanism of shale-liquid interaction and its effect on in-situ stress distribution, laboratory experiments of shale-liquid interaction were carried out on Longmaxi Formation shale in southern Sichuan, and the mechanism and results of the shale-liquid interaction were clarified. On this basis, the influence of shale-liquid interaction on in-situ stress distribution was studied. The results show that the shale-liquid interaction can cause shale damage, and then the micro-fracture occurs, which leads to the shale swelling. The stress distribution can be affected during shale-liquid interaction, and the more complex the fracture network, the more obvious the influence of shale-liquid interaction on stress. Due to the shale-liquid interaction, the distribution of in-situ stress changes significantly during hydraulic fracturing, and the casing stress increases with the shale-liquid interaction time.

Key words: shale-liquid interaction, shale swelling, in-situ stress distribution, casing deformation

CLC Number:

TE257

LI Gao, LI Ze, HU Song, LI Minghao, LI Zhuoyang. Shale-liquid Interaction and Its Effect on In-situ Stress[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(5): 115-123.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2022.06.29.01

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