COILED TUBING WITH IMPROVED FATIGUE RESISTANCE AND METHOD OF MANUFACTURE
摘要
New methods of manufacturing coiled tubing result in increased useful life of the coiled tubing string by creating an enhanced strip-to-strip weld zone having load bearing and/or fatigue resistance properties substantially equal to or greater than the load bearing and/or fatigue resistance properties of the strip base material. The enhanced weld zone is transition into the nominal tubing to reduce stress concentration.
申请公布号
EP2627460(A1)
申请公布日期
2013.08.21
申请号
EP20110773956
申请日期
2011.10.12
申请人
NATIONAL OILWELL VARCO, L.P.
发明人
DANIEL, DAVID L.;VAN ARNAM, WILLIAM D., III;DENNIS, DANNY J.;ELLIOTT, KEVIN J.;HARGIS, CLAYTON D.