Mechanics Parameters Back Analysis of Casing Deformation

Abstract:

A new method is proposed which use optimization modules of finite element established by Ansys Parametric Design Language program to inverse rock mechanics parameters of surrounding rock with the logging data of casing deformation. Therefore the rock mechanics parameters of surrounding rock can be obtained by this back-analysis method based on the elastoplastic deformation analysis of casing. The relation among angle of internal friction, cohesion, maximum horizontal principal stress and minimum horizontal principal stress which can be determined by Mohr-Coulomb failure theory is applied to back-analysis. The new approach is presented to solve the uniqueness of mechanics parameters. The method makes it possible to inverse rock mechanics parameters in the formation where the data of rock mechanics parameters measured are scarce and is more efficient than the traditional method

• Periodical: Advanced Materials Research (Volumes 550-553)
• Pages: 3113-3116
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.550-553.3113
• Online since: July 2012
• Authors: Xiao Peng Zhai, Yi Shan Lou, Bao Sheng He
• Keywords: Casing Deformation, Logging Data, Non-Uniform In Situ Stress, Optimization Back

References

[1] WANG Lijun, YUYongnan, LI Jian, etal. Casing loads distribution with non-uniform in-situ stresses in creep stratum. Journal of the University of Petroleum, China(Edition of Natural Science), 2008,35(1):86-89(In Chinese).

[2] Yin Youquan,Cai Yong en,Chen Zhaowei,Liu Jisheng. Theoretical solution of casing loading in non-uniform ground stress field.Acta Petrolei Sinica,2006,27(4):133-138(In Chinese).

[3] LiuYujing,Liu Ying,Zheng Dawe. Optimization algorithm in the back analysis of identification of rock mechanics parameters from displacements. Journal of Liaoning technical university(natural science), 2000(2) :142-144(In Chinese).