EP 0261909 A3 19890322 - CASING HANGER SYSTEMS
Title (en)
CASING HANGER SYSTEMS
Publication
Application
Priority
- GB 8622859 A 19860923
- GB 8626046 A 19861031
- GB 8705371 A 19870307
- GB 8709430 A 19870421
Abstract (en)
[origin: EP0261909A2] A casing hanger system, particularly for mudline hangers in offshore wells. An inner casing string (24) which includes a running hanger body (20) is suspended by a split ring hanger (40) from an outer casing (44) which includes a receiving hanger (52). The receiving hanger (52) and split ring hanger (40) have complementary profiles (58,60) which lock together when the split ring (40) expands. The split ring (40) is carried down through the outer casing (44) contracted into an annular recess (28) in the running hanger body (20), and temporarily restrained to the lower end of the recess (28). When the running hanger body (20) reaches the receiving hanger (52), the split ring (40) expands so that the complementary profiles (58,60) engage and suspend the ring from the receiving hanger (52). The temporary restraint is released, and the running hanger body (20) descends a further short distance until the upper end (30) of the annular recess lands on the ring (40) to suspend the inner casing string (24) on the ring (40). Two annular arms (48,46) on the recess (28) apply positive locking to the split ring hanger (40) in this position. With dual positive locking, the split ring hanger regains hoop strength.
IPC 1-7
IPC 8 full level
E21B 33/043 (2006.01)
CPC (source: EP)
E21B 33/043 (2013.01)
Citation (search report)
- [X] GB 2120300 A 19831130 - DRIL QUIP INC
- [A] US 4295665 A 19811020 - PIERCE ELWOOD K
- [A] US 4355825 A 19821026 - LEICHT FREDERICK M
- [A] US 4534583 A 19850813 - MILBERGER LIONEL J [US], et al
- [A] GB 2165609 A 19860416 - VETCO OFFSHORE IND INC
Designated contracting state (EPC)
FR GB IT
DOCDB simple family (publication)
EP 0261909 A2 19880330; EP 0261909 A3 19890322; NO 873953 D0 19870922; NO 873953 L 19880324
DOCDB simple family (application)
EP 87308330 A 19870921; NO 873953 A 19870922