Patent ID: 8882157
Filing Date: 2014-11-11
Classification: E21B,F16L

Abstract:
1. A threaded connection for releasably coupling and sealing tubular members, the connection comprising: a tubular coupling having a first box end and a second box end, wherein a longitudinal bore extends through the coupling from the first box end to the second box end, with a center plane disposed proximate the middle of the coupling; an internal thread profile at the first box end of the coupling; an internal thread profile at the second box end of the coupling; a first tubular member having a longitudinal bore extending therethrough, wherein the first tubular member has a first pin end; a second tubular member having a longitudinal bore extending therethrough, wherein the second tubular member has a second pin end, wherein the terminal 3 to 4 inches of each pin end of each tubular member is swaged down to a range of between 2.0% to 6.5% of the outer diameter of the respective tubular member; a first external thread profile at the first pin end of the first tubular member; a second external thread profile at the second pin end of the second tubular member; a conical shoulder at the terminus of the first pin end of the first tubular member, wherein the conical shoulder has an angled primary seal surface relative to the longitudinal bore of the first tubular member; a lipped shoulder at the terminus of the second pin end of the second tubular member, wherein the lipped shoulder has a lip designed to engagingly mate with the conical shoulder of the first tubular member when the first tubular member is connected to the second tubular member by the coupling, wherein the lip is configured to elastically deflect when mated with the conical shoulder and connected by the coupling, and wherein the lip has an angle greater than the angle of the primary seal surface relative to the longitudinal bore of the second tubular member.