Patent ID: 6206436
Filing Date: 2001-03-27
Classification: E21B,F16L

Abstract:
A threaded pipe connection comprising:a box member comprising a tapered, internal, generally dovetail-shaped thread incorporated in a two-step configuration, the internal thread having stab flanks, load flanks, roots, crests and a wedge ratio and increasing in width in one direction;a pin member comprising a tapered, external, generally dovetail-shaped thread incorporated in a two-step configuration, the external thread having stab flanks, load flanks, roots, crests and a wedge ratio increasing in width in the other direction so that the complementary roots and crests of the respective internal and external threads move into engagement during make-up of the connection in conjunction with the moving of complementary stab and load flanks into engagement upon make-up of the connection;wherein the wedge ratio of one step is an aggressive wedge ratio with a larger magnitude; andthe wedge ratio of the other step is a conservative wedge ratio with a smaller magnitude.