Enhance Oil Recovery (EOR) with Slotting Perforation Technology (SPT) - cutting of continued deep slots along the wellbore by special SPT tool/equipment through casing, cement into the productive formation to 3 - 5 ft. depth. This redistributed circular stress conditions to the ends of slots, unloading near wellbore zone, increasing permeability, enlarge drainage area and hydrodynamic connection, raise viscosity, removes colmatation and loose sand pressure, improves reservoir properties, and accordingly productive inflow in dry and low-productive oil and gas wells (according to statistics from 0-1 to 25-30, 50, 70 bbl./day with duration of effect 10-15 years).
Slotting Perforation Technology (SPT) is divided into 1 - Hydro-slotting perforation technology (HSP), 2 - Hydro-mechanical slotting perforation technology, and 3 - Stretch-slotting perforation technology (SSP), currently provided by special EOR SPT service-companies.