Mechanics Mechanism of Re-fracturing in Inclusion Reservoirs
Hydraulic fracturing is an important EOR technology of low permeability reservoirs which occupy a considerable proportion in Chinas oil reserves.If hydraulic fracturing fails,re-fracturing will be used in most oil-water wells.However,there are often a large number of inclusions in low-permeability reservoirs.Due to the complexity of the re-fracturing mechanism in inclusion reservoirs,the theoretical researches are far behind the field practices.Theoretical and experimental studies on the mechanical mechanism of re-fracturing are significant for the development of inclusion reservoirs.Ground stress distribution is one of the major factors which affect fracture propagation after re-fracturing.In this paper line inclusion is seen as a thin bar,and the basic solution of elastic mechanics for line inclusion in infinite plane is used to solve the stress field.Stress field around artificial fracture which is influenced by single line inclusion is deduced.The interference problem of single line inclusion and artificial fracture under internal pressure is reduced to a set of Cauchy singular integral equations.In addition,a validation test with a large size (500mm×500mm×500mm) true tri-axial test equipment is carried out.The results show that,the inclusions reduce rock intensity,and induce reservoir to generate more complex fractures.
Mechanical mechanism of re-fracturing Inclusion reservoir Evolution of stress Fracturing physical simulation
Xue Shifeng Chen Xinmin Han Zhongying Zhang Weidong
College of Pipeline and Civil Engineering,China University of Petroleum,Qingdao,Shandong,266580,Chin School of Petroleum Engineering,China University of Petroleum,Qingdao,Shandong,266580,China
国际会议
北京
英文
1-7
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）