Mudline casing hanger tieback adaptor with adjustable load ring

Details Mudline casing hanger tieback adaptor with adjustable load ring Mudline casing hanger tieback adaptor with adjustable load ring

1985-06-17

1987-03-31

Novosad, Stephen J.

Wells

Processes

Placing or shifting well part

166348, 166208, 285139, F21B 33043

Patent

active

046535896

ABSTRACT:
A method and apparatus comprising a mudline casing hanger tieback adaptor with an adjustable load ring for connecting an installed subsea wellhead on the mudline suspension system.
The mudline casing hanger tieback adaptor (180) includes a mudline hanger adaptor body (182) with an adjustable load ring 184, a packoff nut (104) and packoff (102), casing pup (186), and a tieback tool (190), all of which are lowered on a running tool to be connected to an already installed subsea wellhead (80) and sealably connected to an already installed casing hanger (64) on the innermost casing of a mudline supsension system. The adjustability of the load ring compensates for any tolerance buildup in the already installed casing (32) and adjustably shouldering the load ring (184) on the wellhead (80) transfers the load imposed on the innermost tieback tool (190) and casing hanger (70) back to the wellhead (80) during the high pressure testing of the packoff seal (202) between the tieback tool (190) and casing hanger. The annulus (200) between the mudline casing hanger tieback adaptor (180) and the wellhead (80) is sealed by setting the packoff (202) and the latter is locked down by an adaptor lockdown mechanism (234) threaded into the bore of the wellhead.

REFERENCES:
patent: 3797864 (1974-03-01), Hynes et al.
patent: 3871449 (1975-03-01), Ahlstone
patent: 4453745 (1984-06-01), Nelson
patent: 4465134 (1984-08-01), Watkins
patent: 4561499 (1985-12-01), Berner Jr. et al.
patent: 4595053 (1986-06-01), Walkins et al.

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