Importance

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Abstract

A threaded connection for tubular members comprising a box connector having axially spaced threaded sections and a thread-free section therebetween, the threaded sections of the box connector defining a two-step thread, a pin connector having axially spaced threaded sections and a thread-free section therebetween, the threads in the box connector mating with the threads on the pin connector, there being at least one annular relief in the thread-free portion of at least one of the pin connector and the box connector, an axially facing pin torque shoulder being formed on the pin connector and an axially facing box torque shoulder being formed on the box connector, a metal-to-metal seal being formed between the thread-free sections of the pin and box connectors when the pin torque shoulder and the box torque shoulder are engaged, the annular relief being adjacent the metal-to-metal seal.

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First Claim