Most production losses originate in the near-wellbore region, regardless of completion type. Over time, drilling operations, completion activities, and production-related processes can restrict flow pathways, increase skin, and significantly reduce well productivity. UWST was developed to address this challenge through a non-invasive, chemical-free stimulation method that restores pore throat connectivity and improves fluid flow.
Formation damage is often concentrated within inches of the wellbore, where even minor restrictions can have a major impact on production performance.
Mud filtrate invasion
Solids plugging pore throats
Filter cake buildup on formation surfaces
Perforation crushed zones
Inadequate well cleanup
Plugged screens and completion equipment
Fines migration
Scale deposition (CaCO₃, BaSO₄)
Organic deposits such as asphaltenes and paraffins
Emulsions and wettability changes
These mechanisms restrict permeability, increase pressure drop around the wellbore, and reduce overall production efficiency.
UWST is an electric-line deployed technology that transmits high-frequency ultrasonic waves into the formation. Unlike conventional stimulation methods that rely on chemical reactions or fluid injection, UWST uses acoustic energy to restore flow pathways at the pore scale.
Particle Detachment
High-frequency vibrations break the physical bonds between particles and pore surfaces.
Benefits
Frees blocked pore throats
Detaches fines and solids
Removes debris trapped in screens
Restores permeability without chemicals
Deposit Weakening
Repeated acoustic stress cycles fatigue and fragment deposits attached to the formation and completion equipment.
Targets
Calcium carbonate scale
Barium sulfate scale
Asphaltene deposits
Paraffin deposits
Filter cake buildup
Benefits
Breaks down deposits
Reopens flow channels
Reduces near-wellbore skin damage
Fluid Mobilization & Viscosity Reduction
Ultrasonic energy creates localized fluid movement at the pore level.
Benefits
Mobilizes trapped fluids
Carries dislodged particles away from pore openings
Reduces the risk of immediate re-plugging
Lowers fluid viscosity through molecular agitation
Improves relative permeability and flow efficiency
The combined effect of micro-vibration, oscillatory stress, and acoustic streaming restores pore throat connectivity and fluid mobility.
Reduced skin factor
Improved inflow performance
Enhanced permeability
Increased productivity
Improved reservoir drainage efficiency
As summarized by UWST's operating principle:
Reduce Skin. Reopen Pores. Improve Fluid Mobility.
Traditional matrix acidizing treatments often face significant operational and technical challenges.
Requires large volumes of stimulation fluids
Risk of fluid-rock incompatibility
Potential formation damage from unwanted precipitates
Complex fluid placement and diversion requirements
Corrosive chemicals requiring inhibitors
HSE concerns associated with acid handling
Multiple pumping stages
Heavy intervention requirements
Short-lived treatment effects
In sandstone reservoirs, acid-rock interactions can sometimes create additional precipitates that further reduce permeability.
Non-invasive intervention
No chemical injection
No fluid compatibility concerns
No acid handling risks
Minimal operational footprint
Repeatable throughout well life
Preserves reservoir integrity
Lower intervention costs
According to the brochure's offshore Malaysia cost comparison, ultrasonic stimulation may cost approximately 20–30% of a conventional CTU matrix acidizing operation.
UWST consists of a complete downhole stimulation system engineered for deployment through electric line intervention.
Output: Ultrasonic Waves
Outer Diameter: 44 mm
Intensity: 5 W/cm²
Resonance Frequency: 18–22 kHz
Temperature Rating: 125°C
Pressure Rating: 8,000 psi
Output Voltage: 600 V AC
Operating Frequency: 18–24 kHz
Power: 1 kW
Input Voltage: 500 V DC
Temperature Rating: 125°C
Pressure Rating: 8,000 psi
Output Power: 1.6 kVA
Output Voltage: 700 V DC
Output Current: 2.5 A
The system is deployed through a compact electric-line operation, minimizing logistics and intervention complexity while delivering ultrasonic energy directly into the target interval.
Restore permeability and reactivate damaged flow pathways to unlock incremental production.
No chemicals, no acid injection, and no additional formation damage.
Electric-line deployment reduces equipment requirements and intervention footprint.
Lower economic threshold compared to conventional stimulation methods.
Can be applied multiple times throughout the life of the well without compromising reservoir integrity.
Ultrasonic Well Stimulation Technology offers operators a practical alternative to invasive stimulation methods by using acoustic energy to remove near-wellbore damage, restore permeability, and improve fluid flow under actual reservoir conditions.
A non-chemical, non-invasive solution for maximizing production from existing wells.
