"Classical" Slotting Perforation Technology - opening casing, cement and productive formation by cutting of continuous deep longitudinal slots along the well-bore (all-in-one-cycle process). For creation of slots is used a special SPT equipment/device of hydraulic principle, that cuts slots by rectilinear and constant movement of abrasive cutting jets along the well-bore, and without moving of tubing.


Main idea of "classical" Slotting Perforation  Technology:

Unloading annular compression stresses in the near well-bore zone (for increases of permeability and porosity, and accordingly increasing the productive inflow). Slotting Perforation Technology - the only method, supposed to unload annular compression stress conditions around the well-bore.

Opening a large casing area and creation of a large drainage penetration’s zone in the productive formation (for good hydrodynamic connection well with the productive formation).

"Classical" Slotting Perforation Technology - absolutely environmentally friendly technology (sand and water) without any chemical or mechanical additives.


Last measuring test, made by "Halliburton" in 2014showed the cutting depth of hydro-slotting perforation is near 3.3 feet (1 meter), but depending on the hardness of rocks mathematically cutting depth can not exceed 5.0 feet (1.5 meters).


Slotting Perforation Technology was successfully used in thousands oil and gas wells in different countries: Azerbaijan, Brazil, Canada, China, Saudi Arabia, Eastern and Western Siberia, Jordan, Kazakhstan, Komi Republic, North Caucasus, Poland, Russia, Udmurtia, Ukraine, United States, Urals, Uzbekistan and Yemen.

Some of Slotting Perforation service-companies: "Biddless", "DOGEP", "Dyna", "Exalo", "Hydro-Sandblast", "Hydro-Pressure", "Hydro-mechanical slot perforation", "Maxxwell Production", "Nekko", "Nexus", "Nord Service", "Octopus", "Oil Tech Group", "Kontact", "Komplex".

Hydro-slotting perforation technology

Slot after hydro-slotting perforation

Slot after hydro-slotting perforation

Slot after hydro-slotting perforation

Hole after cumulative perforation






Ecologically safe

Environmentally friendly (used water and sand)

Penetration depth is up to 5 feet (1.5 m)

Opening (drainage) area per one linear meter up to 13 ft² (2 nozzles/slots), and 23 ft² (4 nozzles/slots)

Accordingly opening a large casing's area

Accordingly reduces “breaking component” due passage productive inflow, taking place in a small casing's holes (after gun perforation, cumulative perforation, or abrasive jetting perforation)

Cutting speed is 50 min per linear foot in cased wells, and 30 min per linear foot in open holes

Simultaneous cutting 2, 3, and 4 slots along the wellbore

No detonation impact

No casing damage

No cement cracks

No clog-up the formation borders

Unloading the annular compressive stress conditions in the near wellbore zone up to 50-100 %

Accordingly increase the permeability up to 30-50 %

Accordingly increase the useful productive inflow up to 5-10 times

Can be used in oil, gas, injection and hydro-geological wells

Can be used in newly drilled and low productivity (low debit) wells

Can be used in vertical and horizontal wells

Can be performed with tubing and coiled tubing

Can be used in any formation (sandstone, carbonates, shale’s, thinly interbedded, quicksand, etc.)

Can be used near the water reservoirs (where impossible to use hydraulic fracturing)

Extract more than 20 % additional oil from the layers with higher productivity

Duration of effect 10-15 years

Make an excellent geometry for subsequent fracturing (if necessary)

Hydro-slotting perforation technology