A coiled tubing injector (100) comprises a drive system for independently driving a plurality of chains (102, 104) independently but otherwise retarding relative motion between the driven chains when a chain begins to slip uncontrollably.
申请公布号
WO2012039896(A1)
申请公布日期
2012.03.29
申请号
WO2011US49684
申请日期
2011.08.30
申请人
NATIONAL OILWELL VARCO, L.P.;MCCULLOCH, DAVID, W.;STEFFENHAGEN, TIMOTHY, S.;WHITE, WILLIAM, B.;STEWART, WILLIAM, G.
发明人
MCCULLOCH, DAVID, W.;STEFFENHAGEN, TIMOTHY, S.;WHITE, WILLIAM, B.;STEWART, WILLIAM, G.
