Research of the cement sheath integrity based on the linear and hyperbolic Drucker-Prager criteria
Cement sheath is of vital importance in well life,it prevents inter-zonal cross-flow and provides support for the casing.Considering the complicated environments under down hole condition,numerical simulation plays an important role in cement sheath integrity evalu-ation,accurate description of the mechanical behavior of cement sheath becomes increasingly important.This paper presents an investigation about the failure criteria of cement stone.In order to predict the strength characterization of different cement stones,a series of uniaxial tension and triaxial compression experiment were conducted for cement stone.Based on the experiment results,both linear Drucker-Prager(D-P)and hyperbolic D-P criteria were used to predict the failure of cement stone.A coupled thermo-mechanical finite element model is used to evaluate the cement sheath integrity during the hydraulic fracturing under high tem-perature condition.The experiment results indicate that hyperbolic D-P criteria show better precision than the linear D-P criteria for both compression shear and tensile failure.
the cement sheath integritya coupled thermo-mechanical finite element mod-ellinear Drucker-Prager(D-P)criteriahyperbolic D-P criteria
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维普
