Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge
Reexamination Certificate
2008-02-07
2010-06-15
Wright, Giovanna C (Department: 3672)
Boring or penetrating the earth
Boring with explosion in inaccessible hole
Concave-shaped charge
C166S297000, C166S055100
Reexamination Certificate
active
07735578
ABSTRACT:
A perforating gun having a charge case with a boss element partially circumscribing Optionally the pair of bosses may be included that are substantially symmetric about the axis of the charge case. Forming a shaped charge with such a charge case allows for gun strips to be formed with increased web material between adjacent shape charges in the gun strips. The increased web material provides for a more structurally sound gun tube, especially when dealing with high density charges. Notches may be provided in the gun tube on the outer radius of the holes formed to receive the shape charges, the notches are to be aligned with the bosses on the outer periphery of the shaped charge case. This also may orient the charge cases so they are pre-aligned for ready connection to an associated detonation cord.
REFERENCES:
patent: 3094930 (1963-06-01), Blair
patent: 5046567 (1991-09-01), Aitken et al.
patent: 5590723 (1997-01-01), Walker et al.
patent: 5952603 (1999-09-01), Parrott
patent: 6487973 (2002-12-01), Gilbert, Jr. et al.
Loehr John D.
Markwardt Patrick R.
Baker Hughes Incorporated
Bracewell & Guiliani LLP
Wright Giovanna C
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