Patent ID: 7243957
Filing Date: 2007-07-17
Classification: E21B,F16L

Abstract:
1. A threaded connection having wedge threads, the threaded connection comprising: a pin member comprising a continuous pin thread having a pin thread crest, a pin thread root, a pin load flank, and a pin stab flank, wherein the continuous pin thread comprises at least a first step, a mid-step, and a second step formed sequentially thereon; a box member comprising a continuous box thread having a box thread crest, a box thread root a box load flank, and a box stab flank, wherein the continuous box thread comprises at least a first step, a mid-step, and a second step formed sequentially thereon, the steps on the continuous box thread corresponding generally in axial position with the steps on the pin thread, wherein the first step has a first wedge ratio, the mid-step has a transition wedge ratio, and the second step has a second wedge ratio, wherein thread leads are substantially constant within each of the steps, wherein the connection is designed such that at make-up of the pin member with the box member, a clearance exists between at least one of the corresponding load flanks and the corresponding stab flanks on at least one of the first step, the mid-step, and the second step.