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Research on casing deformation prevention technology based on cementing slurry system optimization

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The casing deformation prevention technology based on the optimization of cement slurry is proposed to reduce the casing deformation of shale oil and gas wells during hydraulic fracturing.In this paper,the fracture mechanism of hollow particles in cement sheath was firstly analyzed by discrete element method,and the effect of hollow particles in cement on casing deformation was investigated by labo-ratory experiment method.Finally,field test was carried out to verify the improvement effect of the casing deformation based on cement slurry modification.The results show that the formation displacement can be absorbed effectively by hollow particles inside the cement transferring the exces-sive deformation away from casing.The particles in the uncemented state provide deformation space during formation slipping.The casing with diameter of 139.7 mm could be passed through by bridge plug with the diameter of 99 mm when the mass ratio of particle/cement reaches 1∶4.According to the field test feedback,the method based on optimization of cement slurry can effectively reduce the risk of casing deformation,and the recommended range of hollow microbeads content in the cement slurry is between 15％and 25％.

Cement slurryHollow ceramsiteCasing deformationFormation slipField test

Yan Yan、Meng Cai、Wen-Hai Ma、Xiao-Chuan Zhang、Li-Hong Han、Yong-Hong Liu

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State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi'an,710077,Shaanxi,China

College of Mechanical and Electrical Engineering,China University of Petroleum(East China),Qingdao,266580,Shandong,China

Shale Gas Evaluation and Exploitation Key Laboratory of Sichuan Province,Chengdu,610095,Sichuan,China

CNPC Daqing Oilfield Company,Daqing,163453,Heilongjiang,China

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中国博士后科学基金Project of Shale Gas Evaluation and Exploitation Key Laboratory of Sichuan Provinceyouth project funded by Shaanxi Province Natural Science Basic Research Program

2023M743886YSK20230042024JC-YBQN-0522

2024

10.1016/j.petsci.2023.10.018

石油科学(英文版)
中国石油大学（北京）

石油科学(英文版)

EI
影响因子：0.88
ISSN：1672-5107
年,卷(期)：2024.21(2)
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