Expendable perforating apparatus

Claim 1

PERFORATING APPARATUS FOR USE IN A WELL BORE COMPRISING A PLURALITY OF CAPSULATED SHAPED CHARGES HAVING SPACED RADIAL PROJECTIONS AND A REAR END WITH A BLASTING CORD RECEIVING OPENING, A BLASTING CORD SIZED FOR RETENTION IN SAID PRIMACORD RECEIVING OPENINGS IN THE REAR ENDS OF SAID SHAPED CHARGES, AND AN INTEGRAL STRIP OF INFRANGIBLE MATERIAL OF A GIVEN THICKNESS AND HAVING OPENINGS SPACED ALONG ITS LENGTH TO RECEIVE SAID SHAPED CHARGES, SAID STRIP HAVING RADIALLY EXTENDING SLOTS ABOUT SAID OPENINGS TO RECEIVE SAID PROJECTIONS, SAID PROJECTIONS HAVING GROOVES THEREIN TO FORM LUGS TO ENGAGE OPPOSITE SIDES OF SAID STRIP WHEN SAID SHAPED CHARGES ARE ROTATED RELATIVE TO A SAID STRIP, SAID STRIP HAVING RADIAL EXTENSIONS EXTENDING INWARDLY OF SAID OPENINGS TO A LESSER GIVEN DIAMETER THAN THE NORMAL DIAMETER OF SAID OPENINGS, SAID EXTENSIONS BEING TAPERED RELATIVE TO AT LEAST ONE PLANE DEFINED BY AN OUTER SIDE SURFACE OF SAID STRIP SO THAT SAID OPENINGS HAVE PORTIONS OF DIFFERENT DIAMETERS ADJACENT THE RESPECTIVE SIDE SURFACES OF SAID STRIPS, SAID SHAPED CHARGES HAVING TAPERED PORTIONS CORRESPONDING GENERALLY TO THE TAPERED EXTENSIONS IN SAID OPENINGS, THEREBY PERMITTING INSERTION OF SAID CHARGE DEVICES FROM ONLY ONE SIDE OF SAID STRIP, SAID BLASTING CORD EXTENDING ALONG THE LENGTH OF SAID STRIP AND THROUGH SAID RECEIVING OPENINGS SO AS TO HOLD SHAPED CHARGES IN FIXED ROTATED POSITION, THEREBY PREVENTING RELEASE OF SAID SHAPED CHARGES FROM SAID STRIP.