(19)
(11) EP 1 072 754 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.10.2004 Bulletin 2004/42

(43) Date of publication A2:
31.01.2001 Bulletin 2001/05

(21) Application number: 00203891.7

(22) Date of filing: 01.07.1998
(51) International Patent Classification (IPC)7: E21B 7/18, E21B 7/20, E21D 9/04, E21D 9/10, E21B 7/28, F16L 15/08, E21C 25/60, E21C 37/12
(84) Designated Contracting States:
BE DE DK FR GB NL SE

(30) Priority: 11.07.1997 EP 97202177

(62) Application number of the earlier application in accordance with Art. 76 EPC:
98202205.5 / 0890708

(71) Applicant: Heerema Holding Construction Inc.
1206 Geneva (CH)

(72) Inventors:
  • Lammertink, Marinus Christiaan
    2518 GH Den Haag, (NL)
  • van Voorden, Rutger Christiaan
    3334 CV Zwijndrecht (NL)
  • Broeder, René
    4102 JT Culemborg (NL)

(74) Representative: Mertens, Hans Victor 
van Exter Polak & Charlouis B.V., P.O. Box 3241
2280 GE Rijswijk
2280 GE Rijswijk (NL)

   


(54) Ground removing device


(57) A device for removing ground (2) comprises a plurality of interconnected jetting units accommodated next to each other at the leading side of the ground removing device. Each jetting unit has a jetting chamber (78) which is open at the leading side thereof. Each jetting chamber (78) comprises a wall at the trailing side thereof. Further, each jetting unit comprises a first duct (86) for feeding jetting fluid to a jetting device in the jetting chamber (78), a second duct (87) for feeding jetting fluid to the jetting chamber (78), and a third duct (68, 90) for removing a ground/fluid mixture from the jetting chamber (78). The ground removing device is pulled through the ground by pulling means (12), which comprise one or more drill strings (14; 62; 112) or casing strings (16).






Search report