Organization
College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, China
State Key Laboratory for the Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China
Abstract
12In order to comprehensively quantify the fault activation failure risk in near-wellbore area of the gas reservoir under the alternating injection and production, using multi-dimensional fault slip sensitivity analysis variables, a quantitative index of shear slip failure risk of borehole section under uncertain in-situ stress coupled dynamic fluid pressure alternating before and after injection-production was constructed. The results show that multi-dimensional parametric perceptual analysis could be more used to evaluate the sealing performance of faults near the well in the gas storage reservoir. The opening angle is the most sensitive index that can reasonably describe the dynamic change of the fault expansion caused by flow pressure. The critical activation stress ratio and the opening angle have high specificity to the opening and closing characteristics of the section. The conclusion also shows that the comprehensive quantitative analysis method proposed in this paper provides a new approach and a new tool for evaluating the activation risk of fault fractures in near-wellbore areas of gas reservoirs under complex geological conditions.
论文详情