Apparatus for running, setting and testing a compression-type well packoff
US4019579A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1976 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | Mar 3, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/043
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus and method for running a compression-type annulus packoff on a drill or other pipe string into an oil or gas well, setting the packoff without rotating the drill string, and then shifting the axial load of the drill string from the packoff to a casing hanger or other suitable well element so that the packoff can be pressure tested under conditions closely simulating normal service conditions. The apparatus comprises an hydraulically actuated well tool that functions both as a means for connecting the packoff to the drill string on which the tool and packoff are run as an assembly into the well, and also as a means for converting hydraulic pressure in the drill string into torque and then transmitting this torque to the packoff for rotating its seal-compressing element, thereby compressing its seal into fluid-tight engagement with the adjacent well elements. The tool can be employed for running and setting a plurality of packoffs at different levels in a wellhead or other outer well element, and can be retrieved from the well after completion of the setting procedure simply by lifting the drill string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.