发明名称 |
REMOTE HYDRAULIC CONTROL OF DOWNHOLE TOOLS |
摘要 |
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 |
EP2961908(A2) |
申请公布日期 |
2016.01.06 |
申请号 |
EP20130876162 |
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 |
分类号 |
E21B34/10;E21B10/32;E21B23/00;E21B41/00 |
主分类号 |
E21B34/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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