Finite Element Simulation of Casing Shearing Impairment in Different Cementing Method
Abstract
Casing impairment in Sazhong block, Daqing oilfield is serious recently. Most of casing failure type is casing shear slip in Nen’er marker layer where a part of well did not cemented. It has a great influence on stress and deformation in the progress of casing shear if the marker bed cemented or not. This paper considered the casing and rock mechanics characteristic after yield, established finite element models to analyze the casing reaction force in the progress. Result shows that stress and deformation of casing is lager than that of side wall rock in two models. In the uncemented well, there is a space between the casing and wellbore. The space can be regard as a buffer room for the formation slip. Uncemented condition is conducive to prevent and repair casing shear failure in marker bed.
Key words: Finite element; Casing impairment; Shearing failure; Daqing oilfield; Maker layer
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DOI: http://dx.doi.org/10.3968/6360
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