Method to improve perforating effectiveness using a charge perforator

摘要

#$%^&*AU2010249294B220110901.pdf#####Abstract A non-linear shaped charge perforator (10) for use in perforating an oil and gas formation into which a wellbore has been drilled comprises a monolithic, axisymmetric metal case (12) in which is disposed a main explosive charge between the front of the case, which is closed with a concave metal linear (24), and the closed back end (14) of the case The main explosive charge contains multiple initiation points (30) , preferably two initiation points located about 180"apart on the outside surface of the charge, so that when the perforator is detonated the main charge is initiated such that the metal liner is collapsed into a noncircular jet, preferably a fan-shaped jet, that pierces the casing of the wellbore and forms non-circular perforations, preferably slot-shaped perforations, in the surrounding formation, 250715Ei1 (GHMtarm)1/3 .'1 22 Fig. 1 20 28 30 265 10l2o 16 32 32 ea 14 24 18 1216 24 Fig. 2 1 Fig. 3 16 310 22 30) 1616 2 20 ///// 24 228 -- 18 --14 -u 20 3 12 30 26 16 22