摘要
为分析不同纤维体积分数下的水泥环对套管受力的作用,在已知不同纤维体积分数的水泥所对应的不同断裂韧性、弹性模量的前提下,应用有限元软件模拟相同套管在相同非均匀载荷条件下,水泥环中纤维体积分数的变化对套管所受到的最大应力大小的影响.模拟结果表明:随着水泥环中纤维体积分数的增加,套管受到的最大应力是呈先陡后缓非线性增大的,这说明纤维体积分数的增加,虽然水泥环的断裂韧性增加,能够有效防止水泥环发生脆性断裂,但也使套管受到的最大应力增大,套管发生破坏的危险性相应增大.
In order to analyze the effect of cement sheath with different volume fraction of fiber on the casing stress,based on the given commensurable fracture toughness and elastic modeling quantity of cement sheath with different volume fraction of fiber,we apply the finite element software to simulate how the casing stress changed under the equal and heterogenetic loading,along with the changing volume fraction of fiber in cement sheath.Simulation shows that with the increasing volume fraction of fiber in cement sheath,the max-stress exerted on the casing is increased nonlinearly.It shows that the increased volume fraction of fiber makes the fracture toughness of cement sheath increase,it can prevent the brittle failure effectively,however,it also makes the max-stress exerted on the casing increase,and the casing damage is more liable to occur correspondingly.
出处
《大庆石油学院学报》
CAS
北大核心
2008年第5期38-40,124,共3页
Journal of Daqing Petroleum Institute
关键词
水泥环
纤维体积分数
断裂韧性
有限元
套管受力
cement sheath
volume fraction of fiber
fracture toughness
finite element
casing stress
