Pump out sub
US4510994A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 6, 1984 |
| Grant date | Apr 16, 1985 |
| Priority date | — |
| Expiry date | Apr 6, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pump out sub for use in a well tubing for receiving a plug for sealing the tubing and applying pressure to the tubing for actuating a well device and thereafter applying a higher pressure to pump out the plug and open the bore. A circular ring is connected in a recess in the bore of the body by shear pins. An expandable seat is positioned in a second recess above the first recess and extends into the bore for receiving a plug and is positioned above and supported from the circular ring. When a plug is seated on the seat pressure may be applied to the tubing for actuating well tools. Thereafter additional pressure is applied to the plug and the ring and the seat moves downwardly and the seat expands into the first recess and out of the bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.