Total control perforator and system

摘要

A shaped charge carrier tool is provided that has particular utility for perforating well casing as a preparation for cement placement. A plurality, four or more elongated shaped charge carrier ribs having a high bending modulus are secured for radially expanded displacement around a central framing tube or rod. Radius rods link the ends of the carrier ribs to top and bottom hinge carriers. The hinge carriers encircle the framing tube and are free for axial translation along the framing tube. Articulating hinges connect the radius rods to the carrier ribs and to the hinge carriers. Opposed compressed coil springs provide a resilient bias on the hinge carriers to translate the carrier ribs radially outward against the interior surface of a well casing as the tool passes from a riser tube into a larger inside diameter well casing.

主权项

1. A pipe perforating tool comprising:
an axially elongated central tube; a plurality of elongated ribs substantially evenly distributed circumferentially around said central tube; a plurality of explosive shaped charges secured along each said rib for discharge along an axis substantially normal to said central tube axis; a parallel translational linkage between said central tube and said elongated ribs; and, a displacement force bearing upon said translational linkage to radially translate said elongated ribs from a first position at a first radial distance from said central tube where said ribs are substantially parallel with said central tube to a second position at a second radial distance from said central tube that is greater than said first radial distance where said ribs remain substantially parallel with said central tube.