Patent ID: 6050610
Filing Date: 2000-04-18
Classification: E21B,F16L,Y10T

Abstract:
A threaded pipe connection, comprising:a box member having a tapered, internal, generally dovetail-shaped thread with stab flanks, load flanks, roots, and crests, the internal thread having a beginning and an end and increasing in width in one direction;a pin member having a tapered, external, generally dovetail-shaped thread with stab flanks, load flanks, roots, and crests, the external thread increasing in width in the other direction so that complementary flanks of the respective threads move into engagement during rotational make-up of the connection and form sealing surfaces that resist the flow of fluids between the threads upon rotational make-up of the connection;a section of one of the internal and external threads having a continuous groove formed in the roots thereof that extends from one of the beginning and the end of the one thread to a point between the beginning and end of the one thread for reducing pressure that develops between the sealing surfaces during rotational make-up in a thread lubricant applied to the threads.