Boring or penetrating the earth – Boring with explosion in inaccessible hole – Independent firing of plural charges
Reexamination Certificate
2008-08-29
2009-11-24
Thompson, Kenneth (Department: 3672)
Boring or penetrating the earth
Boring with explosion in inaccessible hole
Independent firing of plural charges
C175S004600, C102S310000, C102S313000, C102S321000, C089S001150
Reexamination Certificate
active
07621342
ABSTRACT:
A perforating apparatus (100) includes a plurality of shaped charges (102) each having an initiation end and a discharge end. A detonating cord (116) is operably coupled to the initiation ends of the shaped charges (102). A carrier (106) contains the shaped charges (102). The carrier (106) includes at least one discharge location corresponding to the discharge ends of the shaped charges (102) when the perforating apparatus (100) is in its operable position. The discharge location has first and second material layers (122, 124) wherein the second material layer (124) exhibits resilient recovery such that an opening created by a jet formed from detonating one of the shaped charges (102) in the second material layer (124) is smaller than an opening created by the jet in the first material layer (122), thereby retaining debris in the perforating apparatus (100) with the second material layer (124).
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Andrews David
Halliburton Energy Service,s Inc.
Thompson Kenneth
Youst Lawrence R.
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