The solid expandable tubular technology is a newly developing technology that can optimize the wellbore structure, improve the safety of drilling and reduce the cost of drilling significantly in the oil drilling field. It can be applied to the process of drilling, completion and work-over operations. The expansion force in the expansion process is a vital index in the expandable tubular technology. The prediction of the expansion force not only helps to determine the strength margin of the tubular in the engineering, but also contributes the field engineers to choose the appropriate hydraulic equipment. In this paper, the rigid-perfectly plastic model and the linear reinforced rigid plastic model were employed to derive the expansion force expression of TWIP steel expandable tubular. Based on the single curve hypothesis and the Mises flow criterion, the analytical solution of the expansion force was obtained. Then the corresponding FEM models were established to verify the correctness and applicable scope of the expansion force expression under different influence factors. It was found that the expansion force difference of the two material models have similar variation trend under different conditions. The accuracy and applicability of the expansion force expression results of the linear reinforced rigid plastic model improve as the expansion ratio increases and the expansion cone angle decreases.

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