METHOD OF FORMING NONROUND PERFORATIONS IN UNDERGROUND BED BEARING HYDROCARBONS, NON-LINEAR CUMULATIVE PERFORATOR, FIRING PERFORATOR (VERSIONS) Russian patent published in 2009 - IPC E21B43/117 

FIELD: mining.

SUBSTANCE: non-linear cumulative perforator consists of monolithic axis-symmetrical metal coating, wherein main exploding charge is placed between front part of coating, which is covered with concave metal padding (24), and closed back end (14) of coating. The main exploding charge contains several points (30) of initiation disposed at angular distance of around 180° one from another on the external surface of the charge so, that at detonation of the perforator the main charge is initiated, destroying metal padding into nonround jet, preferably, fan-shaped jet, which pierces through a casing pipe of a well and forms nonround perforations, preferably, slot like, in a surrounding bed.

EFFECT: creating method for forming linear or slot-like perforations implementing cumulative exploding perforators of simplified design.

38 cl, 10 dwg