(19)
(11) EP 1 092 077 A1

(12)

(43) Date of publication:
18.04.2001 Bulletin 2001/16

(21) Application number: 99931252.3

(22) Date of filing: 30.06.1999
(51) International Patent Classification (IPC)7: E21B 29/06, E21B 7/06
(86) International application number:
PCT/EP9904/700
(87) International publication number:
WO 0001/921 (13.01.2000 Gazette 2000/02)
(84) Designated Contracting States:
DE GB NL

(30) Priority: 02.07.1998 EP 98305275

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

(72) Inventor:
  • HOEKSTRA, Taco, Sjoerd
    NL-2280 AB Rijswijk (NL)

   


(54) MILLING SYSTEM FOR FORMING A WINDOW IN THE WALL OF A TUBULAR