(19)
(11) EP 0 052 619 A1

(12)

(43) Date of publication:
02.06.1982 Bulletin 1982/22

(21) Application number: 81901285.0

(22) Date of filing: 19.05.1981
(51) International Patent Classification (IPC): 
E21B 33/ 13( . )
(86) International application number:
PCT/SE1981/000149
(87) International publication number:
WO 1981/003356 (26.11.1981 Gazette 1981/28)
(84) Designated Contracting States:
AT DE FR GB

(30) Priority: 21.05.1980 SE 19800003823

(71) Applicant: Fagersta AB
S-773 01 Fagersta (SE)

(72) Inventors:
  • ROSSANDER, Bror
    S-773 00 Fagersta (SE)
  • FRIBERG, Herbert
    S-780 41 Gagnef (SE)

   


(54) A METHOD AND APPARATUS FOR LINING HOLES FORMED WHEN DRILLING THROUGH EARTH LAYERS