岩石、水泥环、套管互作用的粘弹塑性有限元力学模型

Viscoelastic-plastic Finite Element Mechanics Models of Interaction of Rock, Cement Ring and Casing

本文首次建立了套管变形的粘弹塑性有限元力学模型。通过理论和实践证明，力学模型Ⅲ是准确而可靠的，此力学模型可研究会管外壁受均匀或非均匀载荷作用下．其弹塑性变形过程，是一种研究会管变形的新方法。该模型在华北油田应用，我们仿真摸拟出了套管周围的外载荷大小分布，为寻求套管周围的地应力大小及抵抗套管变形的方案提供了重要的参考数据．

The paper has first established the viscoelastic-plastic finite element mechanics models of casing deformation. Theory and practice have proved that the mechanics model ill is accutate and reliable. The mechanics model,a new method to study casing deformation,can study the process of casing elastoplastic deformatiom under uniform or non-uniform load acting on the outer wall of casing. While applied in Huabei Oil Field,the model ill has imitated the casing around outer load and its distribution,hence providing important reference data for solving the casing around stresses and finding the method of resisting casing deformation.