Hydraulic release apparatus and method for retrieving a stuck downhole tool and moving a downhole tool longitudinally
US5361834A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1993 |
| Grant date | Nov 8, 1994 |
| Priority date | — |
| Expiry date | Sep 2, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic release mechanism for retrieving a stock downhole tool from a well casing having an elongated, cylindrical jack body, a piston carried in a bore in the jack body and a latching portion carried co-axially by the jack body for connecting with the stock tool. The piston is movable within the jack body under the influence of fluid pressure from a first position to a second position. The movement of the piston to a position intermediate its first and second positions causes an anchor slip member to ramp over a wedge member and expand radially outward against the well casing to restrain further longitudinal movement of the piston in the casing. A shearable element prevents relative motion between the anchor slip member and the jack body until the anchor slip member is moved radially outward against the well casing. The shearable element shears and releases the jack body for longitudinal motion in the casing relative to the piston when the anchor slip member is expanded radially outward against the casing, locking the piston in place. The latching portion is operatively engageable with the tool in a manner permitting the stuck tool to be lifted loose when the jack body is move…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.