(19)
(11) EP 0 774 039 A1

(12)

(43) Date of publication:
21.05.1997 Bulletin 1997/21

(21) Application number: 95929072.0

(22) Date of filing: 01.08.1995
(51) International Patent Classification (IPC): 
E21B 43/ 11( . )
E21B 11/ 06( . )
 E21B 10/ 32( . )
E21B 29/ 00( . )
(86) International application number:
PCT/EP1995/003091
(87) International publication number:
WO 1996/004457 (15.02.1996 Gazette 1996/08)
(84) Designated Contracting States:
DE DK GB NL

(30) Priority: 02.08.1994 EP 19940202239

(71) Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
2596 HR Den Haag (NL)

(72) Inventors:
  • ROSS, Brent, Reynolds
    NL-2288 GD Rijswijk (NL)
  • WORRALL, Robert, Nicholas
    NL-2288 GD Rijswijk (NL)

   


(54) DEVICE AND METHOD FOR MAKING A SLOT IN AN UNDERGROUND FORMATION