Patent US8863823B1 (Granted October 21, 2014)
“Universal underground hydro-slotting perforation system, controlled by working fluid pressure, for activation and intensification of gas, oil and hydro-geological wells”:
Equipment for hydro-slotting perforation. Used to restore the old, dry, dead, low productivity oil and gas wells with hydro-slotting perforation technology.
Can be used in all formations: sandstone, carbonate, shale's, etc.