Remote hydraulic control of downhole tools
US9453380B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2013 |
| Grant date | Sep 27, 2016 |
| Priority date | — |
| Expiry date | Feb 26, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/108
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.