Abstract

Abstract Drillpipe for deep, sour, highly deviated, abnormally pressured Norphlet wells in the Mobile Bay Area requires tensile and torsional strength in excess of conventional API Grade X-95 drillpipe with NC50 tool joints. It was decided to construct a drillstring from 105,000 psi [724 MPa] minimum yield strength steels with optimum chemical composition for welding, toughness, and resistance to H2S exposure. Design load requirements led to the selection of a tool joint with a secondary torque shoulder. Quality assurance testing indicated that an SSC resistant, Grade CG-105 grade drillpipe is feasible to manufacture.

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