Tieback wellhead system with sidetrack facilities

Wells – Submerged well – Connection or disconnection of submerged members remotely...

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166382, 166208, 285141, 285143, E21B 2300, E21B 33043

Patent

active

050801732

ABSTRACT:
A subsea well has tieback facilities for further sidetrack drilling. The well has an inner string casing hanger with an outer hanger portion and an inner hanger portion. The inner and outer hanger portions are latched together at the surface and lowered simultaneously. The inner casing string secures to the inner hanger portion. The tieback assembly includes an intermediate tieback conduit that extends into the bore of the outer hanger portion. An inner tieback conduit extend into the bore of the inner hanger portion. For later sidetrack drilling, the inner tieback conduit is pulled upward to unlatch the inner hanger portion from the outer hanger portion, retrieving the inner casing through the intermediate tieback conduit.

REFERENCES:
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patent: 4093030 (1978-06-01), Bonds
patent: 4540053 (1985-09-01), Baugh et al.
patent: 4577686 (1986-03-01), Milberger et al.
patent: 4595053 (1986-06-01), Watkins et al.
patent: 4691780 (1987-09-01), Galle, Jr. et al.
patent: 4880061 (1989-11-01), Ahlstone
patent: 4976458 (1990-12-01), Hosie et al.
Combustion Engineering, Vetco Offshore Production Equipment, pp. 814-815.

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