VDA Viscoelastic Diverting Acid

Overview Library

Damage-free carbonate stimulation

VDA viscoelastic diverting acid, a self-diverting, polymer-free acidizing fluid, can be used alone or with other treating acids for total zonal coverage in carbonate reservoirs. It viscosifies as it stimulates in carbonate formations, diverting the remaining acid treatment fluid into zones of lower injectivity for

  • improved zonal coverage across long intervals and high permeability contrasts
  • efficient wormholing behavior in a wide range of conditions
  • better leakoff control than straight hydrochloric and noncrosslinked gelled acid
  • high fluid efficiency during acid fracturing treatments
  • simple mixing for a smaller equipment footprint.

VES fluid technology for total zonal coverage

Diverters can cause formation damage in carbonate formations. Viscoelastic polymer-free surfactant (VES) does not damage the formation and can be bullheaded. It is self-diverting without incurring residual damage.

Enhanced, drag-reducing properties significantly lower friction pressure to reduce pumping requirements and treat deeper zones. VES-based fluids include VDA viscoelastic diverting acid, ClearFRAC polymer-free hydraulic fracturing fluids, and ClearPAC polymer-free fluid for gravel packs.

Ideal consistency

The fluid rapidly develops viscosity in situ upon acid spending and becomes self-diverting. The viscosity reduces dominating wormholes and allows the fluid to stimulate other zones.

Reduced cleanup costs

Recovery and well cleanup are easy after treatment. The barrier is broken down by production or dilution with formation fluids. Only low pressures are required for a smoother process.

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Combined Downhole System Increases Production

Stimulation combining the ABRASIJET service’s high-pressure jetting tool with ACTive DTS Inversion analysis enabled the identification of thief zones during treatment.
Combined technologies including VDA acid provided data and increased production by 500 bbl/d for an operator in the Middle East.
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