Wellhead apparatus
Patent
·
OSTI ID:6418510
There are disclosed two embodiments of wellhead apparatus for use in suspending concentric strings of casing of an offshore well at the ocean floor. For this purpose, an inner hanger to which the inner casing is connected is adapted to be landed within an outer hanger to which the outer casing is connected, each at the ocean floor or ''mudline''. Seating surfaces are formed on the bore of the tubular body of the outer hanger body, and landing surfaces are formed on a circumferentially split landing ring arranged about the tubular body of the inner hanger and having landing surfaces formed thereabout for expansion and contraction within a recess about the tubular hanger body between a contracted position as it is moved vertically within the outer casing and bore of the tubular body of the outer hanger, and an expanded position in which the landing surfaces thereon are landed upon the seating surfaces when disposed opposite thereto. The landing ring is retained in a position for expansion and contraction within the recess by detent means which is releasable, when the landing ring is in landed position, and the weight of the inner casing is slacked off so as to lower the inner hanger body into supported position on the landing ring.
- Assignee:
- Dril Quip Inc.
- Patent Number(s):
- US 4468055
- OSTI ID:
- 6418510
- Country of Publication:
- United States
- Language:
- English
Similar Records
Wellhead apparatus
Wellhead hanger and seal
Mudline subsea wellhead system
Patent
·
Mon Dec 26 23:00:00 EST 1983
·
OSTI ID:6841017
Wellhead hanger and seal
Patent
·
Tue May 23 00:00:00 EDT 1989
·
OSTI ID:5623296
Mudline subsea wellhead system
Patent
·
Tue Aug 31 00:00:00 EDT 1993
·
OSTI ID:6092376