(19)
(11) EP 0 427 422 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.10.1991 Bulletin 1991/43

(43) Date of publication A2:
15.05.1991 Bulletin 1991/20

(21) Application number: 90311621.8

(22) Date of filing: 23.10.1990
(51) International Patent Classification (IPC)5: E21B 34/06, E21B 34/14, E21B 43/11, E21B 33/14
(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 08.11.1989 US 435144

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

(72) Inventors:
  • Brandell, John T.
    Duncan, Oklahoma 73533 (US)
  • Szarka, David D.
    Duncan, Oklahoma 73533 (US)
  • Sullaway, Bob L.
    Duncan, Oklahoma 73533 (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: : 
   
       


    (54) Casing valve


    (57) A casing valve for use in a well comprises an outer housing (50) having a longitudinal passageway (52) defined therethrough and having a housing wall (54) with a housing communication port (56) defined through said housing wall, said housing including a first disintegratable plug (96) initially blocking said housing communication port; and a sliding sleeve (66) slidably disposed in said longitudinal passageway, said sleeve having a longitudinal sleeve bore (90) defined therethrough and having a sleeve wall (92) with a sleeve communication port (94) defined through said sleeve wall, said sleeve including a second disintegratable plug (98) initially blocking said sleeve communication port, said sleeve being selectively movable relative to said housing between a first position wherein said housing communication port and said sleeve communication port are out of registry with each other and a second position wherein said ports are in registry with each other.










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