A new joint has been designed to overcome the problems associated with running large diameter API buttress thread surface casing. The paper covers the design concept; assessment of design options; Initial Finite Element Analysis of design options; detail design and fine mesh elastic/plastic F.E.A. of the final design; product testing under internal pressure, bending, and tension; correlation of strain gauge data with computer stress analysis; The joint is of the threaded and coupled type and the development of machining techniques and novel gauging techniques for producing precision threaded connections on large diameter casing is dicussed. Experience in Initial field trials of the joint Is covered.

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