How it works
Clean the bottomhole zone at its resonant frequency
Instead of blindly forcing fluid into a formation, we drive it at its own resonant frequency — cleaning precisely where the skin damage is, and nowhere else. Patented in the United States and Russia.
The physics
How does sound move oil that pressure can't?
Two physical mechanisms — confirmed by calculation and laboratory experiment — explain how acoustic energy in resonance mode releases oil that pressure alone cannot.
Mechanism 1
Droplet detachment
The passing sound wave physically tears oil droplets off the rock grains — the acoustic force exceeds the adhesion between the droplet and the pore channel.
Mechanism 2
Mobilisation & coalescence
Larger droplets become mobile and merge into continuous oil “channels”. The acoustic force, together with Van der Waals attraction, overcomes electrostatic repulsion holding oil films on the grains.
Even small pressure-wave amplitudes measurably increase the mobility of formation oil.
Distance at which the generated sound waves were reliably detected from the device.
Increase in filtration speed in a saturated porous medium under resonance-mode vibration.
Why resonance
Why does conventional cleaning make some wells worse?
Most treatments clean the already watered-out, high-permeability sublayer — and disconnect the less-permeable, oil-bearing sublayers. Total fluid goes up; oil goes down.
Vibro-resonance stimulation targets only the contaminated sublayer, in resonance mode — removing its skin factor without further cleaning the washed-out layer.
The main precondition for success is simple and measurable: a positive skin factor on the target interval. If your well has one, resonance can likely remove it.
Chemical-free alternative to acidizing — the comparison →The source of vibration
A hydrodynamic generator, tuned like an instrument
The generator is a housing with tangential inlet channels, a vortex chamber and a diffuser. Its geometry — together with the hydrodynamic parameters of the pumped fluid — defines the frequency and amplitude it produces.
Resonance happens when the generated frequency matches the natural frequency of the treated near-well zone — estimated from the formation’s porosity and permeability through its filtration “noise”.
Every generator is custom-built for its well, to hit that formation’s band. Typical working range: 1.5–10 kHz.
Five engineered variants
Generator with an additional diffuser
Diffuser shaped as a body of revolution
Resonance chamber of variable volume
Two inlet channels and two outlet diffusers
Spring-loaded annular protrusion — high amplitude at low frequencies
Resonance is a band, not a point — each generator is tuned to its formation
Illustrative curve — the 1.5–10 kHz band and 2–3× filtration gain are documented; each generator is engineered to its formation’s resonant frequency.
1,632 Hz Spectrum analyser trace from the experimental stand — the generator's dominant peak, recorded on two channels. This is how every generator is characterised before it is matched to a formation's resonant band.
The method
Five controlled steps
- 01
Measure or calculate the resonant-frequency bandwidth of the target formation
- 02
Calculate the design parameters of the wave generator from formation data
- 03
Attach the wave generator to the end of standard production tubing or coiled tubing
- 04
Lower the tubing so the generator sits exactly at the target stimulation interval
- 05
Circulate wellbore fluid at a specific, controlled rate and pressure
Treatment scheme
Practically identical to a standard well wash
Treatment runs in a circulation regime — tank → pump → tubing → generator → annulus → tank — for 4–8 hours depending on the treated zone. No exotic operations, no new risk profile for the crew.
- 1
- Production tubing (NKT)
- 2
- Casing
- 3
- Crossover between tubing and generator
- 4
- Vibration wave generator
- 5
- Perforation interval
- 6
- Pump unit — 20–30 m³/h at 15–22 MPa (≈2,200–3,200 psi)
- 7
- Standard separation tank (20–40 m³)
- 8
- Valves
- 9
- Pressure gauge
- 10
- Sealing coupling between tubing and high-pressure hose
- 11
- High-pressure hose
- 12
- Annulus
With coiled tubing, the generator is lowered inside the tubing to the perforation zone — so gas-lift wells can be treated while producing. Used at Prudhoe Bay (Alaska) and on a North Sea platform.
Validated, not assumed
Hundreds of spectra from a full-scale test stand
The generators were characterised on an experimental stand simulating real downhole conditions: a 5-metre section of 178 mm casing under 5–10 MPa static pressure, fed by a 14.5 MPa line.
Side-mounted sensors recorded each generator’s amplitude–frequency response, while a core holder measured how vibration changes filtration rates through actual core samples.
The result: a validated design method that links formation data to generator geometry — before anything is lowered into your well.