Study on the Mechanism of Casing Damage due to Water Injection

Abstract:

The theories of rock and soil mechanics and nonlinear finite element method were introduced to casing damage analysis, the physical models of casing damage were established, the relation between the water injection pressure and strata dislocation was investigated, also the influence of fault was considered. The results based on the nonlinear finite element method show that the water injection pressure is the direct cause of strata dislocation. The fault has significant influence to strata dislocation. When the fault exists, even the natural pressure of water injection may cause considerable local strata dislocation. The high pressure of water injection will not produce strata dislocation at the absence of faults. The casing damage near the fault is probably caused by strata dislocation, but the casing damage far from the fault may be considered causing by other factors. The present method offers theoretical reference for taking measures scientifically to prevent and control casing damage, and also offers a new idea for casing damage analysis.

• Periodical: Advanced Materials Research (Volumes 524-527)
• Pages: 1602-1605
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.524-527.1602
• Online since: May 2012
• Authors: Zhi Yong Zhang, Chi Ai, Hong Zheng
• Keywords: Casing Damage, Fault, Nonlinear Finite Element Method, Strata Dislocation, Water Injection Pressure

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