Research Article

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

Table 9

P110 13Cr B type tubing loading point for cycle test (API RP 5C5 B-series).

Loading stepsLoading pointInternal pressure (MPa)Axial mechanical load (kN)Total axial load (kN)Test temperature (°C)Holding time (min)VME %Axial load efficiency

11018421842Ambient temperature59595
2277.212281842Ambient temperature159595
33938141549Ambient temperature59580
44103.40819Ambient temperature595CEPL
5594.4−7480Ambient temperature5950
6675.8−1237−640Ambient temperature1595−33
7745.2−1656−1300Ambient temperature1595−67
880−1842−1842Ambient temperature595−95
9277.212281842Ambient temperature159595
1080−1842−1842Ambient temperature595−95
11745.2−1656−1300Ambient temperature1595−67
12675.8−1237−640Ambient temperature1595−33
13594.4−7480Ambient temperature5950
144103.40819Ambient temperature595CEPL
153938141549Ambient temperature59580
16277.212281842Ambient temperature159595
171018421842Ambient temperature59595
18277.212281842Ambient temperature159595
193938141549Ambient temperature59580
204103.40819Ambient temperature595CEPL
21594.4−7480Ambient temperature5950
22675.8−1237−640Ambient temperature1595−33
23745.2−1656−1300Ambient temperature1595−67
2480−1842−1842Ambient temperature595−95
25277.212281842Ambient temperature159595