A coiled tubing injector comprises a drive system for independently driving a plurality of chains independently but otherwise retarding relative motion between the driven chains when a chain begins to slip uncontrollably.
申请公布号
EP2619399(A1)
申请公布日期
2013.07.31
申请号
EP20110752728
申请日期
2011.08.30
申请人
NATIONAL OILWELL VARCO, L.P.
发明人
MCCULLOCH, DAVID, W.;STEFFENHAGEN, TIMOTHY, S.;WHITE, WILLIAM, B.;STEWART, WILLIAM, G.
