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 steps | Loading point | Internal pressure (MPa) | Axial mechanical load (kN) | Total axial load (kN) | Test temperature (°C) | Holding time (min) | VME % | Axial load efficiency |
| 1 | 1 | 0 | 1842 | 1842 | Ambient temperature | 5 | 95 | 95 | 2 | 2 | 77.2 | 1228 | 1842 | Ambient temperature | 15 | 95 | 95 | 3 | 3 | 93 | 814 | 1549 | Ambient temperature | 5 | 95 | 80 | 4 | 4 | 103.4 | 0 | 819 | Ambient temperature | 5 | 95 | CEPL | 5 | 5 | 94.4 | −748 | 0 | Ambient temperature | 5 | 95 | 0 | 6 | 6 | 75.8 | −1237 | −640 | Ambient temperature | 15 | 95 | −33 | 7 | 7 | 45.2 | −1656 | −1300 | Ambient temperature | 15 | 95 | −67 | 8 | 8 | 0 | −1842 | −1842 | Ambient temperature | 5 | 95 | −95 | 9 | 2 | 77.2 | 1228 | 1842 | Ambient temperature | 15 | 95 | 95 | 10 | 8 | 0 | −1842 | −1842 | Ambient temperature | 5 | 95 | −95 | 11 | 7 | 45.2 | −1656 | −1300 | Ambient temperature | 15 | 95 | −67 | 12 | 6 | 75.8 | −1237 | −640 | Ambient temperature | 15 | 95 | −33 | 13 | 5 | 94.4 | −748 | 0 | Ambient temperature | 5 | 95 | 0 | 14 | 4 | 103.4 | 0 | 819 | Ambient temperature | 5 | 95 | CEPL | 15 | 3 | 93 | 814 | 1549 | Ambient temperature | 5 | 95 | 80 | 16 | 2 | 77.2 | 1228 | 1842 | Ambient temperature | 15 | 95 | 95 | 17 | 1 | 0 | 1842 | 1842 | Ambient temperature | 5 | 95 | 95 | 18 | 2 | 77.2 | 1228 | 1842 | Ambient temperature | 15 | 95 | 95 | 19 | 3 | 93 | 814 | 1549 | Ambient temperature | 5 | 95 | 80 | 20 | 4 | 103.4 | 0 | 819 | Ambient temperature | 5 | 95 | CEPL | 21 | 5 | 94.4 | −748 | 0 | Ambient temperature | 5 | 95 | 0 | 22 | 6 | 75.8 | −1237 | −640 | Ambient temperature | 15 | 95 | −33 | 23 | 7 | 45.2 | −1656 | −1300 | Ambient temperature | 15 | 95 | −67 | 24 | 8 | 0 | −1842 | −1842 | Ambient temperature | 5 | 95 | −95 | 25 | 2 | 77.2 | 1228 | 1842 | Ambient temperature | 15 | 95 | 95 |
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