Abstract

Different techniques are adopted for perforation like conventional perforation with casing gun in positive head, through tubing perforation with negative head, special type of through tubing perforation using pivot- mounting folded big shot charges, tubing conveyed perforation technique, stimgun perforation technique, combining perforation & perforation breakdown using propellant sleeve, perforation with extremely over balance pressure., drillable perforating system to have in one-trip perforating, packer placement and cementing. All the techniques have been discussed and compared with their relative advantages and disadvantages with special emphasis on through tubing perforation (TTP).