论文成果

Research on casing deformation failure mechanism during volume fracturing for tight oil reservoir of horizontal wells

摘要:Volume fracturing has shown great promise in reconstructing unconventional oil/gas reservoirs effectively, while new problems of frequent casing deformation failure were triggered. In this paper, based on drilling and completion data, rock damage criterion and microseismic surveillance data, and previous studies about relevant influencing factors, 2D and 3D finite element model (FEM) of casing-cement sheath-formation are established to study the mechanism of casing deformation during multi-stage volume fracturing of Z1 tight oil horizontal well. The results show: a) those factors thought by most scholars just cause the cross-section of the casing smaller change, which do not block the bridge plugs pumped by elastic coiled tubing; b) influenced by in-situ stress, natural fractures tend to slip when the stress difference is large enough, and slippage is mostly likely to happen as the angle between the natural fracture and maximum horizontal stress reaches 30°and the shear displacement is usually several centimeters; c) natural fracture slip is accompanied by drastic local casing shrinkage, with slight deformation one side and severe another, as observed from the impression blocks in oilfields. The results demonstrated in this paper can provide the theoretical basis for the prevent treatment of casing deformation failure during the fracturing reconstruction of stimulated reservoir volume of tight oil horizontal well.
© 2017 ARMA, American Rock Mechanics Association.

卷、期、页:v 2,p836-844

发表日期:2017-01-01

期刊分区(SCI为中科院分区):无

收录情况:EI(工程索引)

发表期刊名称:US Rock Mech. / Geomech. Symp.

通讯作者:李海涛,李扬,林森

第一作者:邓金根,刘伟

论文类型:会议论文

论文概要:李海涛,邓金根,刘伟,李扬,林森,Research on casing deformation failure mechanism during volume fracturing for tight oil reservoir of horizontal wells,US Rock Mech. / Geomech. Symp.,2017,v 2,p836-844

论文题目:Research on casing deformation failure mechanism during volume fracturing for tight oil reservoir of horizontal wells