TARGET OF HYDRO-SLOTTING PERFORATION TECHNOLOGY
Hydro-slotting perforation is the most effective technology of opening productive formation through the casing, and cement sheath with slicing long and deep longitudinal slots along the borehole.
TARGET OF HSP
Opening a large casing’s area and creation of a large drainage penetration’s zone in the productive formation (for good hydrodynamic connection well with the productive formation).
Unloading annular compressive stress in the near wellbore zone (for increases of permeability and porosity, and accordingly productive inflow).
Hydro-slotting perforation is the only method, supposed to unload annular compressive stress conditions around the wellbore.
HSP slots are created by rectilinear and constant movement of abrasive cutting jets along the wellbore without moving tubing.
All other known methods of abrasive perforation which are use mixture of sand and water not capable to make a deep continuation slots. Abrasive jets (or point) perforation, for example, just can make a hole with depth of 1 foot, and no more. Only upon application of a rectilinear translational motion to abrasive jets is possible get a deep continuation slots. Also the extended slots cannot be created due moving tubing from the surface, tool movement must be created only directly in the cutting zone within wellbore.
Hydro-slotting perforation is possible to use in vertical and horizontal wells, oil, gas, injections and hydro-geological wells, newly drilled and old wells. HSP is applicable to any formation (carbonates, sandstones, limestone, shales, etc.), any conditions (thin-interbedded layers, close-drowning, low-temperature, high-viscosity, loose sands, etc.), and in any sequence with the other methods.
Hydro-slotting perforation is a reasonably efficient technology for produce influx in the newly drilled wells, and for successful completion/recompletion of old low-producing oil and gas wells with guaranteed recovery of productive influx from 0-5 bbl./day up to 25-35 bbl./day and even much more, with the lasting effect 10-15 and more years.
HSP technology refers to basic methods of initial opening casing, cement and productive formation (as some kinds of drilling, gun perforation, cumulative perforation, abrasive jet’s-point perforation, and some types of slotted perforations), and not refers to stimulation (optional) methods (as acoustic, acid, air, cavitation, chemical, electrical, frequency, gas, hydraulic, laser, magnetic, plasma, pneumatic, pulse, resonance, shock, steam, stress (overstress), temperature, thermal, ultrasonic, vacuum, vibration, wave etc.)
Efficacy and duration of any known stimulation (optional) methods are depending on the size of opened surface area in the steel casing and cement. None of the currently known stimulation methods cannot overcome this barrier to fully affect the productive formation behind the casing (if hole in the casing is small, the effect is short and small too). Stimulation (optional) methods cannot work by itself without opening methods.