摘要 |
Rotating control device related oilfield pressure control is accomplished by upper and lower seal members configured to seal around a tubular, a chamber defined between the upper and lower seal members; and wherein fluid enters and/or exits the chamber via some device or structure. Such a device or structure could be a relief valve, a first accumulator, a pressure control valve, an orifice, and/or a void space in a seal member in a location which contacts the tubular. |
申请人 |
WEATHERFORD/LAMB, INC. |
发明人 |
BAILEY, THOMAS, F.;WAGONER, DANNY, W.;BARRY, ANDREW, A. W.;HARRALL, SIMON, J.;CHAMBERS, JAMES, W. |