Research Article

Experimental Study on Sealing Failure Mechanism of Injection-Production String in Underground Gas Storage under Cyclic Loading

Table 8

P110 13Cr B type tubing loading point for single reciprocating cycle test (with bending).

Loading stepsLoading pointInternal pressure (MPa)Axial mechanical load (kN)Total axial load (kN)Dog-leg angle (°/30 m)Holding time (min)

1101646164605
225012901646010
32B50109014781210
4350039501
5450−1175−77905
64B50−997−6051210
7550−1602−1206010
85B50−1429−10331210
96−1557−155705
104B50−997−6051210
11450−1175−77905
12350039501
132B50109014781210
1425012901646010
15101646164605