Critical Length and Collapse of Interlayer in Rock Salt Natural Gas Storage

Table 5

Critical length and collapse condition of the interlayer (m).

Number	Design radius (L1)	Critical radius (L2)	Rest part length (L3)	Unstable part length (L4)	Logging length (L5)	Accuracy (|L5 − L3|)/L3 (%)
A1	20	14.06	5.94	14.06	6.5	90.6
A2	25	12.82	12.18	12.82	13.2	91.6
B	25	55.60	25	0	20	80
C1	20	5.68	2.96	17.04	3.2	91.9
C2	25	14.10	10.9	14.1	11.5	94.5
C3	20	25.00	20	0	20	100