The invention provides a downhole shut-in tool for obtaining formation pressure data. The tool includes a fast-closing main valve and a pressure-relief valve operable between open and closed positions to effect periodic sealing and release of formation pressure with respect to the surface.
申请公布号
WO2004099558(A2)
申请公布日期
2004.11.18
申请号
WO2004CA00709
申请日期
2004.05.12
申请人
STELLAR TECH SYSTEMS INC.;FELUCH, PAUL, JOHN;TIMOFFEE, BORIS
