(19)
(11) EP 1 345 003 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
12.05.2004 Bulletin 2004/20

(43) Date of publication A2:
17.09.2003 Bulletin 2003/38

(21) Application number: 03251375.6

(22) Date of filing: 06.03.2003
(51) International Patent Classification (IPC)7F42B 1/028, F42B 1/032
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR
Designated Extension States:
AL LT LV MK RO

(30) Priority: 12.03.2002 US 96609

(71) Applicant: Halliburton Energy Services, Inc.
Dallas, Texas 75381-9052 (US)

(72) Inventors:
  • Barlow, Darren R.
    Mansfield, Texas 76063 (US)
  • Glenn, Corbin S.
    Benbrook, Texas 76126 (US)

(74) Representative: Curtis, Philip Anthony et al
A.A. Thornton & Co., 235 High Holborn
London WC1V 7LE
London WC1V 7LE (GB)

   


(54) Shaped charge liner with precursor liner


(57) A method to remove well bore fluid from the path of a shaped-charge jet in order to reduce the effect it has on the jet tip. A precursor liner (70) and a primary liner (50) are both pressed in the same housing (12). The primary liner (70) is similar or equivalent to a standard big hole shaped charge liner. The precursor liner (70) is pressed into the apex end (54) of the primary liner (50) and upon detonation is intended to form an initial very fast moving precursor jet to open a path through the fluid of the well bore annulus for the following primary jet.







Search report