Releasable guide post mount and method for recovering guide posts by remote operations
US4439068A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1982 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | Sep 23, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B41/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for releasably supporting a guide post to an underwater well installation and a method for recovering such a guide post by remote operation from the surface. The apparatus comprises a support sleeve coupled to the well installation and receiving a lower end portion of the guide post therein, an outer actuating sleeve movably supported on the support sleeve, and a plurality of locking elements coupled to the support sleeve and moved radially inwardly into engagement with the guide post by means of the actuating sleeve. The locking elements have ring segments engageable by the actuating sleeve and radially inwardly directed pins which pass through bores in the support sleeve and are received in a locking groove in the guide post lower end portion. The guide post is recoverable by a remotely lowered and operated tool that has a first pair of jaws for engaging and lifting the actuating sleeve, thereby unlocking the guide post, and a second pair of jaws for engaging and retrieving the unlocked guide post to the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.