Effect of the In-Situ Stress Field on Casing Failure

Based on the geologic structure, seismic data, exploitation information and the data of rock mechanics tests in Qinghai oil field, the finite element mechanics model of delaminated in-situ stress with a great deal of complicated faults was set up with ANSYS software. The stress concentration area, tensile stress area and compression stress area of the oil field were determined according to the rock’s Drucker-Prager rule. The distribution of casing failure in the oil field indicated that it was closely relative to those areas. By applying the study of the paper and taking some preventing measures, the casing failure was controlled and the economic benefit had been evidently growing up. This paper offers a new study method to prevent casing failure and the theoretic reference for the mechanism study of casing failure.

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