Method and apparatus for selective disengagement of a fluid transmission conduit operable under oppositely directed pressure differentials
US4458751A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 1981 |
| Grant date | Jul 10, 1984 |
| Priority date | — |
| Expiry date | May 21, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus and method for the insertion and disengagement of a tubing string used in a subterranean well subject to oppositely directed pressure differentials is disclosed. A packer apparatus which anchors a portion of the tubing string against rotation is used in conjunction with a disengagable on/off connector and a valve apparatus capable of withstanding oppositely directed pressure differentials. The valve apparatus can be selectively opened and closed by rotary manipulation of the tubing string through the disengagable on/off connector. Portions of the tubing string above the valve apparatus can then be inserted into the well or removed from the well or tested for pressure integrity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.