Patent ID: 9534455
Date: 2017-01-03
CPC Classifications: E21B

Claim:
1. A tubular section in a borehole penetrating the earth, the tubular section comprising: a first tubular member including a threaded pin section with a plurality of threads; a second tubular member, the second tubular member including a threaded box section configured to mate with the threaded pin section; and a shoulder ring disposed between the first tubular member and the second tubular member, an end of the shoulder ring being in contact with an end of the threaded pin section of the first tubular member over the entire circumference of the end of the threaded pin section and a same axial line going through the center of the shoulder ring, the center of the first tubular member, and the center of the second tubular member, wherein a wall thickness of at least a portion of the shoulder ring is greater than a smallest wall thickness of the threaded pin section of the first tubular member and an outer radius of the shoulder ring is greater than a smallest outer radius between a pair of the plurality of threads in the threaded pin section, wherein the shoulder ring is fixed to at least one of the first tubular member and the second tubular member using a threaded nut or a screw.