Patent ID: 6123368
Filing Date: 2000-09-26
Classification: E21B,F16L

Abstract:
A threaded pipe connection, comprising:a box member having a tapered, internal, generally dovetail-shaped thread incorporated in a two-step wedge configuration such that there exists a smaller step and a larger step each with stab flanks, load flanks, roots, and crests, the internal thread increasing in width in one direction; anda pin member having a tapered, external, generally dovetail-shaped thread incorporated in a two-step wedge configuration such that there exists a smaller step and a larger step each with stab flanks, load flanks, roots, and crests, the external thread increasing in width in the other direction so that the complementary stab flanks, load flanks, roots, and crests of the respective threads move into engagement during rotational make-up of the connection, and form sealing surfaces that resist flow of fluids between the threads on the smaller step of the box member and the smaller step of the pin member upon rotational make-up of the connection, while leaving clearance between the roots and crests of the threads on the larger step of the box member and the larger step of the pin member upon rotational make-up of the connection.