Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge
Patent
1995-11-09
1997-10-07
Neuder, William P.
Boring or penetrating the earth
Boring with explosion in inaccessible hole
Concave-shaped charge
166298, E21B 43117
Patent
active
056737602
ABSTRACT:
A perforating gun includes a multiplicity of shaped charges, the multiplicity of shaped charges including a plurality of planes of charges, each plane of charges including a plurality (N) of shaped charges and a detonating cord running down through the axial center of each of the plurality of planes of charges. The plurality (N) of shaped charges are equally spaced at an angle 360/N about the detonating cord. The plurality of planes of charges: (1) are rotated at an angle of 180/N relative to one another, and (2) are axially packed together along the longitudinal axis of the gun so that the charges in one plane are nearly touching the charges in the adjacent plane, yet they all share the same centered detonating cord. The proximity of one plane to another is close enough such that one plane of charges detonates within a few microseconds of its neighboring plane of charges. The close packing of the shaped charges in the same plane and between adjacent planes: (1) prevent the charge cases from expanding significantly upon detonation, and (2) prevent the charge cases from breaking up into numerous small pieces (large chunks of charge case debris results). A near-maximum packing density for a given cylindrical gun volume produces two unexpected properties: (1) a reduced swelling of the gun's diameter after detonation because of the combination of the near maximum packing density and symmetric detonation of the shaped charges; and (2) a significant reduction in the amount of shaped charge case debris that can escape from the perforating gun.
REFERENCES:
patent: 4773299 (1988-09-01), Oestreich et al.
patent: 4960171 (1990-10-01), Parrott et al.
Brooks James Emmert
Lands Jack Fergurson
Lendermon Gary Mack
Lopez de Cardenas Jorge Enrigue
Parrott Robert Al
Bouchard John H.
Neuder William P.
Ryberg John J.
Schlumberger Technology Corporation
Waggett Gordon G.
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