Shale-liquid Interaction and Its Effect on In-situ Stress
During drilling and completion in shale formation,shale-liquid interaction between working fluid and shale is in-evitable.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 in-teraction,the distribution of in-situ stress changes significantly during hydraulic fracturing,and the casing stress increases with the shale-liquid interaction time.
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