(19)
(11) EP 0 478 094 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.05.1992 Bulletin 1992/21

(43) Date of publication A2:
01.04.1992 Bulletin 1992/14

(21) Application number: 91203095.4

(22) Date of filing: 15.06.1987
(51) International Patent Classification (IPC)5: E21B 33/038, E21B 19/00
(84) Designated Contracting States:
FR GB

(30) Priority: 31.07.1986 US 891391

(62) Application number of the earlier application in accordance with Art. 76 EPC:
87905009.4 / 0315636

(71) Applicant: HALLIBURTON COMPANY
Duncan Oklahoma 73536 (US)

(72) Inventors:
  • Gano, John C.
    Carrollton, Texas 75007 (US)
  • Schwendemann, Kenneth L.
    Lewisville, Texas 75067 (US)
  • Noack, Timothy J.
    Grapevine, Texas 76051 (US)
  • Godfrey, Craig W.
    Carrollton, Texas 75007 (US)

(74) Representative: Wain, Christopher Paul et al
A.A. THORNTON & CO. Northumberland House 303-306 High Holborn
London WC1V 7LE
London WC1V 7LE (GB)


(56) References cited: : 
   
     
    Remarks:
    This application was filed on 27 - 11 - 1991 as a divisional application to the application mentioned under INID code 60.
     


    (54) Method and system for attaching and removing equipment from a wellhead


    (57) A system and method for attaching and removing equipment (25) from a subsea wellhead (26) in which equipment is lowered and raised on a flexible riser pipe (22), cables (34) extend from the equipment (25) to the wellhead (26) and are winched in and out to control movement of the equipment (25) adjacent the wellhead (26). While the cables (34) are being winched in or out, the cables (34) are maintained in tension by the reel (33) and a motion compensator (36) between the equipment (25) and riser pipe (22) which can reciprocate vertically with the vessel (20) in response to wave action, while the equipment (25) is insulated from this action during engagement and disengagement with the wellhead (26). The cable winch system may be used to reconnect the riser pipe lower connector (29, 31) to the remainder of the equipment (28) after disconnection.






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