Adjustable mandrel hanger assembly

Details Adjustable mandrel hanger assembly Adjustable mandrel hanger assembly

1992-08-06

1993-10-26

Britts, Ramon S.

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166382, 166 98, 285145, E21B 4310

Patent

active

052557464

ABSTRACT:
An adjustable mandrel hanger assembly will maintain tension in a section of casing extending from a subsea location to a surface wellhead. The assembly has a mandrel that secures to the upper end of the casing. The mandrel has grooves on its exterior. A collet slides over the mandrel and has grooves on its interior for mating with the grooves on the mandrel. The collet has inclined load flanks on its exterior. A load ring lands on a load shoulder provided in the surface wellhead housing. The load ring has load flanks on its interior that engage the load flanks of the collet. A retaining ring locks the load ring in the wellhead housing. A running tool pushes downward on the load ring while tension is maintained on the mandrel. The collet ratchets over the mandrel grooves.

REFERENCES:
patent: 4456070 (1984-06-01), Watkins
patent: 4903992 (1990-02-01), Jennings et al.
patent: 4909546 (1990-03-01), Nobileau
patent: 4919454 (1990-04-01), Caulfield et al.
patent: 4949786 (1990-08-01), Eckert et al.
patent: 5002131 (1991-03-01), Cromar et al.

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