Clamping well casings

Details Clamping well casings Clamping well casings

1998-10-26

2000-07-25

Bagnell, David

Wells

Above ground apparatus

Inner member anchor or seal with lateral port

166 961, 166 882, E21B 2300, E21B 3302

Patent

active

060925965

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.

REFERENCES:
patent: Re34071 (1992-09-01), Van Bilderbeek
patent: 2097615 (1937-11-01), Burns et al.
patent: 3093996 (1963-06-01), Jones
patent: 3177703 (1965-04-01), Waters et al.
patent: 4090395 (1978-05-01), Dixon et al.
patent: 4408783 (1983-10-01), Gruller
patent: 4458521 (1984-07-01), Pillette
patent: 4465134 (1984-08-01), Watkins
patent: 4653589 (1987-03-01), Alandy
patent: 4842082 (1989-06-01), Springer
patent: 4982795 (1991-01-01), King
patent: 5706894 (1998-01-01), Hawkins, III
patent: 5735344 (1998-04-01), Duncan
Ringfeder brochure, Nov. 1993.

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