Stress sensitivity of formation during multi-cycle gas injection and production in an underground gas storage rebuilt from gas reservoirs

LI Jiqiang,ZHAO Guanqun,QI Zhilin,YIN Bingyi,XU Xun,FANG Feifei,YANG Shenyao,QI Guixue

Table 2 Comparison between the operation cycle of gas storage and the variation process of net stress.

Operational cycle of gas storage Net stress variation Remarks 0 1 The first time of pore pressure decrease simulated the depletion development process of the gas reservoir, the first process of net stress increase. 1 2 The first time of pore pressure increase simulated the first gas injection process of gas storage; the first process of net stress decrease. 3 The second time of pore pressure decrease simulated the first gas production process of the gas storage; the second process of net stress increase. 2 4 The second time of pore pressure increase simulated the second gas injection process of gas storage, the second process of net stress decrease. 5 The third time of pore pressure decrease simulated the second gas production process of gas storage, the third process of net stress increase. 3 6 The third time of pore pressure increase simulated the third gas injection process of gas storage, the third process of net stress decrease. 7 The fourth time of pore pressure decrease simulated the third gas production process of gas storage, the fourth process of net stress increase