Patent attributes
An improved perforating apparatus that creates drain holes in well tubing without the use of explosives. A hydraulically-activated apparatus created from machined metal pipes and solid metal bars that form four main sections, a hollow metal pipe 10, hollow metal chamber 11, wedge holder 12, and a wedge stop 13. A drive disc 14, drive wedge 15, piston 16, metal button 17, shear screws 19, and wedge holder O-rings 20, a drive disc O-ring 21, a piston O-ring 30, and a wedge stop O-ring 31 complete and seal the apparatus. When perforating apparatus reaches a location to be perforated, an impact bar is manually-dropped into tubing string and hits top of the apparatus. The force of well fluid pressure on a drive disc 14 within the apparatus forces drive wedge 15 inside drive holder 12 to impact piston 16. Impact on piston 16 expels button 17 through well tubing, creating a drain hole.
