Bridge plug
US4436150A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 1981 |
| Grant date | Mar 13, 1984 |
| Priority date | — |
| Expiry date | Sep 28, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/065
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An inner mandrel extends the full length of the bridge plug, and carries a top sub at its upper end for latching engagement with a conventional overshot to retrieve the plug. A tubular outer mandrel is slidably mounted on the inner mandrel for limited axial sliding movement. A partial central bore in the inner mandrel and coacting ports adjacent the upper ends of the two mandrels provide a valved bypass passage bridging the seal element. External slips are carried in a slip carrier axially fixed to the inner mandrel by shear screws. A tubular setting assembly consisting of a lower top wedge for expanding the external slips, an upper compression member, and an annular elastic seal element disposed for compression between the wedge and compression member, is yieldably secured to the outer mandrel by means of shear pins. Second yieldable shear pins couple the top wedge and compression member. The outer mandrel and tubular setting assembly are adapted to be coupled to electric line operated pressure setting apparatus for lowering the tool and for effecting upward pull of the mandrel and downward push of the setting assembly to set the tool. During the setting, the setting assembly firs…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.