Clamping well casings
US6092596A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1998 |
| Grant date | Jul 25, 2000 |
| Priority date | — |
| Expiry date | Oct 26, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/047
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A clamp for clamping two concentric tubes, typically two concentric tubes 2,4 in an oil or gas well. The clamp has two axially movable tapered components 6,7 which can be pulled over one another in an axial direction to provide a contraction of internal diameter which grips the smaller diameter tube. In one embodiment, a spacer 12 is fitted to allow the tapered components to be held apart until the tubes have been correctly positioned. The spacer is then removed, and the tapered components are drawn together to effect the clamping. A hydraulic ram 5 can be provided to separate the tapered components should readjustment be required. In another embodiment, the larger diameter tube is made with a relatively thin wall, so that it can be distorted inwards to grip the smaller tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.