(19)
(11) EP 0 543 642 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.08.1993 Bulletin 1993/32

(43) Date of publication A2:
26.05.1993 Bulletin 1993/21

(21) Application number: 92310533.2

(22) Date of filing: 18.11.1992
(51) International Patent Classification (IPC)5: E21B 33/126, E21B 33/068, E21B 33/128
(84) Designated Contracting States:
DE DK FR IT NL

(30) Priority: 22.11.1991 US 796203

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

(72) Inventors:
  • Brisco, David P.
    Duncan, Oklahoma 73533 (US)
  • McGuire, David D.
    4056 Tananger (NO)

(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: : 
   
       


    (54) Downhole seal circulating devices


    (57) A cup-type seal circulating device (10) or a compression type packer seal circulating device for use in running a string of casing into a well bore, has a connector member (12) for connection to the drilling rig equipment to allow fluid to be pumped into the device; a seal body member (14); a seal assembly (16) and a check valve (18). The circulating device is received in casing (22) and the seal assembly seals between the seal body member and the casing (22).






    Search report