OILFIELD THREADED CONNECTIONS

摘要

A threaded oilfield tubular connection includes a box connector 12 having internal threads 16, 18, and a pin connector 14 having external threads 22, 24 for mating with the internal threads. Each of a box torque shoulder 20 and a pin torque shoulder 26 may be negative angle shoulders, and the thread flanks on the internal and external threads may also be negative angle load flanks. The connector substantially maintains a desired preload when dope is trapped between the threads during makeup. Another embodiment provides positive angle torque shoulders and positive angle load flanks.