Method for detecting a leak in a drill string valve
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A method for detecting a leak in a drill string valve used when drilling a subsea well. The method comprises measuring a first inlet pressure at a subsea mudlift pump while a subsea mudlift pump and a surface pump are operating and before a well is fully shut-in and measuring a second inlet pressure at the subsea mudlift pump after the mudlift pump and the surface pump are shut down and after the well is fully shut-in. The first and second subsea mudlift pump inlet pressure measurements are then compared, and a check is performed to determine if the subsea mudlift pump inlet pressure has increased by an amount greater than an estimated annular friction pressure.
Schubert, Jerome J.; Alexander, Carmon H.; Juvkam-wold, Hans C.; Weddle III, Curtis E.; Choe, Jonggeun (2002). Method for detecting a leak in a drill string valve. United States. Patent and Trademark Office; Texas A&M University. Libraries. Available electronically from