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
US8544536(B2)
申请公布日期
2013.10.01
申请号
US20100890323
申请日期
2010.09.24
申请人
MCCULLOCH DAVID W.;STEFFENHAGEN TIMOTHY S.;WHITE WILLIAM B.;STEWART WILLIAM G.;NATIONAL OILWELL VARCO, L.P.
发明人
MCCULLOCH DAVID W.;STEFFENHAGEN TIMOTHY S.;WHITE WILLIAM B.;STEWART WILLIAM G.