(19)
(11) EP 0 622 523 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.06.1995 Bulletin 1995/25

(43) Date of publication A2:
02.11.1994 Bulletin 1994/44

(21) Application number: 94106648.2

(22) Date of filing: 28.04.1994
(51) International Patent Classification (IPC)5: E21B 43/08, E21B 43/04
(84) Designated Contracting States:
CH DE FR GB LI NL

(30) Priority: 30.04.1993 JP 127846/93

(71) Applicant: NAGAOKA INTERNATIONAL CORPORATION
Minami Kawachi-gun, Osaka-fu (JP)

(72) Inventors:
  • Tadayoshi, Nagaoka, c/o Nagaoka Internat.Corp.
    Kawachi-gun,Osaka-fu (JP)
  • Sparlin, Derry D,
    Spring, Texas 77379 (US)
  • Ashton, Jefferson Springs
    Conroe, Texas 77302 (US)

(74) Representative: Selting, Günther, Dipl.-Ing. et al
Patentanwälte von Kreisler-Selting-Werner, Bahnhofsvorplatz 1 (Deichmannhaus)
50667 Köln
50667 Köln (DE)


(56) References cited: : 
   
       


    (54) Well screen having a slurry flow path


    (57) A well screen (1) having slurry flow paths (6) enclosed therein includes support rods (3) extending in the axial direction of the screen disposed cylindrically at a predetermined interval in the circumferential direction of the screen, a wire (5) wound on the outer periphery of said support rods so as to form slits (4) of a predetermined width, one or more flow paths (6) for gravel-containing slurry provided inside of the wire and extending in the axial direction of the screen, and openings (7) for communicating the flow paths with the outside of the screen. Lowering and lifting of the screen through a wellbore can be made smoothly without interfering of the slurry flow paths with the wellbore and installation of the screen can thereby be faciliated.






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