文档介绍：Effect Of The In-Situ Stress Field On Casing Failure *
Tang Bo
Southwest Petroleum Institute, People's Republic of China
Lian Zhanghua
Southwest Petroleum Institute, People's Republic of China
Abstract
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.
Introduction
A casing is a steel pipe string to protect the wall of oil, gas or water wells from collapsing, divide the
stratum fluids and ensure the productive activities in gear. Along plicated geologic structures, the
casing stresses will change pany with the in-situ stresses.
Because there are many differences in the geologi