(19)
(11) EP 1 789 652 A2

(12)

(43) Date of publication:
30.05.2007 Bulletin 2007/22

(21) Application number: 05791498.8

(22) Date of filing: 22.08.2005
(51) International Patent Classification (IPC): 
E21C 37/18(2006.01)
(86) International application number:
PCT/US2005/030178
(87) International publication number:
WO 2006/023998 (02.03.2006 Gazette 2006/09)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 20.08.2004 US 603509 P
19.08.2005 US 208579
19.08.2005 US 208671
19.08.2005 US 208766
19.08.2005 US 208950

(71) Applicant: Tetra Corporation
Albuquerque, NM 87109 (US)

(72) Inventors:
  • MOENY, William
    Rio Rancho, NM 87044 (US)
  • HILL, Gilman
    Englewood, CO 80112 (US)

(74) Representative: Kupecz, Arpad 
Octrooibureau Los en Stigter B.V. Weteringschans 96
1017 XS Amsterdam
1017 XS Amsterdam (NL)

   


(54) PULSED ELECTRIC ROCK DRILLING, FRACTURING, AND CRUSHING METHODS AND APPARATUS