A well tool apparatus comprises a control arrangement configured to control response of the downhole tool by varying a bore-annulus pressure difference. The control arrangement includes a valve piston longitudinally slidable in a generally tubular controller housing that is in operation substantially co-axial with the wellbore, to open or close a valve port to a fluid flow connection between the drill string's interior and the tool. A latch mechanism is configured to latch the valve piston against movement in one axial direction, keeping the valve piston in an open or a closed condition. Unlatching of the valve piston requires displacement thereof in the other axial direction to a mode change position. A stay member is automatically displaceable under hydraulic actuation responsive to bore-annulus pressure differences above a trigger threshold value, to obstruct movement of the latched valve piston under hydraulic actuation to the mode change position.
申请公布号
WO2014133487(A2)
申请公布日期
2014.09.04
申请号
WO2013US27825
申请日期
2013.02.26
申请人
HALLIBURTON ENERGY SERVICES, INC.
发明人
HARDIN, JR., JOHN RANSFORD;WINSLOW, DANIEL M.;LASSOIE, JEAN-PIERRE;MOURARET, NICOLAS