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Patent Searching and Data


Title:
REMOTE HYDRAULIC CONTROL OF DOWNHOLE TOOLS
Document Type and Number:
WIPO Patent Application WO/2014/133487
Kind Code:
A3
Abstract:
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.

Inventors:
HARDIN JR JOHN RANSFORD (US)
WINSLOW DANIEL M (US)
LASSOIE JEAN-PIERRE (BE)
MOURARET NICOLAS (BE)
Application Number:
PCT/US2013/027825
Publication Date:
December 11, 2014
Filing Date:
February 26, 2013
Export Citation:
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Assignee:
HALLIBURTON ENERGY SERV INC (US)
International Classes:
E21B4/02; E21B34/16; E21B44/00
Foreign References:
US20040222022A12004-11-11
EP0220401A21987-05-06
US20090032308A12009-02-05
US20090126936A12009-05-21
US6161632A2000-12-19
Other References:
See also references of EP 2961908A4
Attorney, Agent or Firm:
PERDOK-SHONKA, Monique M., Reg. No. 42,989 et al. (Lundberg & Woessner P.A.,P.O. Box 293, Minneapolis Minnesota, US)
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