中国石油大学学报（自然科学版）2017，Vol.41Issue(6)：140-146,7.DOI:10.3969/j.issn.1673-5005.2017.06.017
基于位移不连续模型的多裂缝应力干扰极限距离计算
Critical distance of stress shadow of multiple-cracks based on displacement discontinuity model
摘要
Abstract
A small specimen test is conducted in MTS to get the elastic modulus and Poisson's ratio of tight sandstone core in R13 field. The irregularity of hydraulic crack surface is ignored, and the cracks are simplified as smooth and parallel to each other. Considering the discontinuity of the multi-cracks, they are treated as discontinuous boundaries of the continuous stra-tum. Then the displacement discontinuity method is used to construct a boundary element model, which is applicable to cal-culate the distribution of stress around the multi-crack system, and determine the critical distance of the crack swarms' stress shadow with different clusters and different ways of cloth sewn. The results show that the appearance of artificial multiple-cracks has significantly changed the distribution of stress field around the cracks. The more the cluster number, the longer the distance takes effect. But the influence of the cluster number increasing on the distance becomes smaller, taking on a log-arithmic tendency. However, the change of crack spacing between 20 and 30 meters, in a single stage has little influence on the critical distance of stress shadow. This study indicates that the boundary element model based on the displacement dis-continuity theory can accurately predict the distribution of the stress field around the multiple-cracks and the critical distance of the crack swarms' stress shadow.关键词
多裂缝/应力干扰/位移不连续理论/极限距离Key words
multiple-cracks/stress shadow/displacement discontinuity method/critical distance分类
能源科技引用本文复制引用
闫相祯,董卫,樊恒,闫怡飞,许建国..基于位移不连续模型的多裂缝应力干扰极限距离计算[J].中国石油大学学报（自然科学版）,2017,41(6):140-146,7.基金项目
国家自然科学基金项目(51374228) （51374228）
中国博士后科学基金项目(2017M612375) （2017M612375）
国家科技重大专项(2016ZX05017-003-01) （2016ZX05017-003-01）
中国石油天然气集团公司重点实验室项目(2016A-3905) （2016A-3905）
