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
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.
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.
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.