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 3 Regression analysis results of retention rate and stress sensitivity index of permeability of the samples.

Operational cycle of gas storage	Net stress changing process	Permeability retention rate						Stress sensitivity index of permeability
Operational cycle of gas storage	Net stress changing process	Sample 1	Sample 2	Sample 3	Sample 4	Sample 5	Sample 6	Sample 1	Sample 2	Sample 3	Sample 4	Sample 5	Sample 6
0	1	1.000 0	1.000 0	1.000 0	1.000 0	1.000 0	1.000 0	0.026 3	0.034 6	0.059 9	0.078 0	0.229 5	1.108 2
1	2	0.995 8	0.991 8	0.987 9	0.985 5	0.921 6	0.615 5	0.018 6	0.019 3	0.037 4	0.050 4	0.076 8	0.194 1
1	3	0.995 8	0.991 8	0.987 9	0.985 5	0.921 6	0.615 5	0.020 4	0.025 3	0.046 6	0.060 3	0.098 5	0.405 2
2	4	0.994 6	0.988 5	0.982 7	0.979 6	0.911 2	0.546 3	0.018 1	0.019 3	0.036 8	0.049 0	0.078 6	0.192 3
2	5	0.994 6	0.988 5	0.982 7	0.979 6	0.911 2	0.546 3	0.019 0	0.024 8	0.038 1	0.052 2	0.089 7	0.290 4
3	6	0.994 3	0.986 8	0.981 1	0.977 9	0.904 8	0.517 0	0.018 2	0.021 8	0.035 7	0.048 9	0.077 8	0.200 4
3	7	0.994 3	0.986 8	0.981 1	0.977 9	0.904 8	0.517 0	0.018 5	0.024 4	0.035 7	0.048 7	0.094 1	0.250 5