Expendable charge case holder

Details Expendable charge case holder Expendable charge case holder

E - Fixed Constructions

21

B

E21B 43/117 (2006.01)

Patent

CA 2183841

An expendable shaped charge holder for a perforating gun. The holder is a thin- walled tube having an aperture for a shaped charge for installation in the tube by insertion through the aperture. There is a plurality of fingers unitary with the tube wall protruding into the tube interior with surfaces which together define a cavity for receipt of the case of the charge. The surfaces of the fingers engage the case when brought into abutting contact with the fingers so that the fingers support the installed charge in the holder. The tube can include a tab associated with the aperture and unitary with the tube wall. Such tab has an end attached to the tube wall and is bendable by means of a hand-held tool into abutting contact with an upper rim of the case of the installed charge to affix the charge in the tube. The tube can have a longitudinal axis and a plurality of apertures spaced from each other. There can be an assembly of the tube and shaped charges. The assembly can include a detonation cord and the fingers can be shaped to locate the base of the charge case with respect to an interior wall of the tube to provide a gap for locating the detonation cord in a position with the cord in operable contact with the initiator of the charge.

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