Clamping well casings
US7111688B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 2003 |
| Grant date | Sep 26, 2006 |
| Priority date | — |
| Expiry date | Nov 24, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L39/005
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A clamp for clamping two concentric tubes, typically two concentric tubes in an oil or gas well. The clamp has two axially movable tapered components 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 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 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.