The Analysis on Wall Effect After Expansion and Expandable With Threaded Performance of Single Wellbore Diameter Expandable Casing

Zhiyuan HUANG, Peng LEI, Tao SHI


Single wellbore diameter expandable casing technology is an important development direction of the expandable casing technology. The development and maturity of this technology will cause a revolution in drilling technology. Elastic-plastic finite element analysis of frictional contact is used to analyze the effect of geometrical deviation before expansion on casing thickness after expansion; the expansion casing thread connections expandability is analyzed, the connection status of the expanded general casing thread is simulated, then based on the study above, one kind of thread which is suitable for the single wellbore diameter expandable Casing connection is designed. The results for this paper provide the basis for the standardization of the expansion casing’s machining precision and the selection of connecting thread, which promote the development of single wellbore diameter expandable casing.


Single wellbore diameter expandable casing; Drilling technology; Analysis of frictional contact; Threaded performance; Non-uniform wall thickness

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