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 steps | Loading point | Internal pressure (MPa) | Axial mechanical load (kN) | Total axial load (kN) | Dog-leg angle (°/30 m) | Holding time (min) |
| 1 | 1 | 0 | 1646 | 1646 | 0 | 5 | 2 | 2 | 50 | 1290 | 1646 | 0 | 10 | 3 | 2B | 50 | 1090 | 1478 | 12 | 10 | 4 | 3 | 50 | 0 | 395 | 0 | 1 | 5 | 4 | 50 | −1175 | −779 | 0 | 5 | 6 | 4B | 50 | −997 | −605 | 12 | 10 | 7 | 5 | 50 | −1602 | −1206 | 0 | 10 | 8 | 5B | 50 | −1429 | −1033 | 12 | 10 | 9 | 6 | | −1557 | −1557 | 0 | 5 | 10 | 4B | 50 | −997 | −605 | 12 | 10 | 11 | 4 | 50 | −1175 | −779 | 0 | 5 | 12 | 3 | 50 | 0 | 395 | 0 | 1 | 13 | 2B | 50 | 1090 | 1478 | 12 | 10 | 14 | 2 | 50 | 1290 | 1646 | 0 | 10 | 15 | 1 | 0 | 1646 | 1646 | 0 | 5 |
|
|