Thread connection exceeds pipe-body plasticity

A compression test conducted on a 7 5/8-in., 39-lb/ft P-110 casing joint buckled the pipe body rather than the connection.The test, conducted by Grant Prideco for Shell Offshore Inc.'s Brutus oil and gas field in the Gulf of Mexico, demonstrated the ability of the connection to withstand high compressive loads similar to conditions found on subsurface offshore wells."As an oil and gas reservoir depletes, the formation tends to collapse," says Jerry Buster, manager special accounts for Grant Prideco. This behavior in turn induces compressive strain on the pipe and connections in the 2-6% range. An accordion effect, or double bulging, developed during the compression test. The pipe sec...

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