Research Article

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

Table 10

Tensile test results.

The sample numberTimesYield strength (MPa)Tensile strength (MPa)Elongation rate (%)

Tubing body after the test170288123
273990323
372289724

Tubing body before the test182089126
282488224
382287725

Regulations in API Spec 5C758∼965≥862≥13