A system includes a valve subassembly configured to be disposed along an internal flowline exit of a first internal flowline within a downhole drilling module. The valve subassembly includes an active valve configured to regulate flow of a fluid through the internal flowline exit and a passive valve configured to be passively controlled based on a differential pressure between a first volume of the downhole drilling module and a second volume surrounding the downhole drilling module.
申请公布号
AU2013345189(A1)
申请公布日期
2015.05.28
申请号
AU20130345189
申请日期
2013.11.04
申请人
SCHLUMBERGER TECHNOLOGY B.V.
发明人
HARMS, KENT DAVID;MURPHY, JEREMY T.;STUCKER, MICHAEL J.;BRENNAN III, WILLIAM E.;HOEFEL, ALBERT;VILLAREAL, STEVEN G.;POP, JULIAN J.