Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge
Patent
1996-05-22
1997-12-30
Tsay, Frank
Boring or penetrating the earth
Boring with explosion in inaccessible hole
Concave-shaped charge
102312, 102321, E21B 43116
Patent
active
057019649
ABSTRACT:
A through-tubing perforating gun and method is provided. The assembly comprises an elongated carrier strip, a plurality of perforating charges, and means for connecting the plurality of charges to the carrier strip. Each of the charges has a focal axis along which a shaped charge explosion occurs in a firing direction when the charge is actuated for use in perforating the casing wall, a cross-section that fits within a circle defined by the smallest inner diameter of the well tubing through which the assembly is intended to pass, and a detonating cord receiving means. The means for connecting the plurality of charges to the carrier strip is such that: the cross-sections of the plurality of charges substantially overlap along the line extending parallel to the length of the carrier strip, whereby the overall cross-section of the assembly fits within a circle defined by the smallest inner diameter of the well tubing through which the assembly is intended to pass; and at least one of the plurality of charges has its focal axis angularly displaced at least about 30 degrees relative to the focal axis of the next adjacent perforating charge; and the focal axis of any one of the plurality of perforating charges is angularly displaced from the focal axis of the next adjacent perforating charge no more than about 80 degrees. The means for connecting can comprise a mounting clip. More preferably, the clip is mountable to the strip in two orientations. Further, the clip is adapted such that a perforating charge is mountable to the clip in two orientations. Thereby, the clip provides a plurality of charge mounting orientations.
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Gill Bennie C.
Lawson James P.
Walker Jerry L.
Halliburton Energy Service,s Inc.
Tsay Frank
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