VDA Viscoelastic Diverting Acid | Carbonate VES | Schlumberger

VDA

Viscoelastic diverting acid

Optimize carbonate stimulation with a polymer-free fluid

VDA viscoelastic diverting acid, a self-diverting, polymer-free acidizing fluid, can be used alone or with other treating acids to maximize 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.
Schlumberger Lab Worker Looking at Fluid in Glass Beaker
Combined Downhole System Increases Production
Combined technologies including VDA acid provided data and increased production by 500 bbl/d for an operator in the Middle East.
Read case study

Improve uniformity of stimulation across long intervals

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 acidClearFRAC polymer-free hydraulic fracturing fluids, and ClearPAC polymer-free fluid for gravel packs.

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.

Reduce 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.

VDA viscoelastic diverting acid
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