In order to evaluate the frictional strength between casing and mud sediment for Methane Hydrate (MH) production well integrity, push-out test was conducted under different confining pressure.From the test results, the effective friction angle and effective cohesion at the interface between the simulated casing pipe and mud was shown. Furthermore, as compared with the previous studies on different materials contact surface between the production well and sediment, it was revealed that the casing-mud interface is the weakest.

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