VDA Viscoelastic Diverting Acid System

The VDA system is gelled acid system that overcomes some of the traditional problems encountered when trying to increase the viscosity of mineral acid stimulation treatments, reduce frictional pressures and the high cost of obtaining a crosslinked live acid fluid system and provide a means for in diversion to untreated sections of the formation. VDA provides ample retardation and helps prevent excessive leak-off through wormholes. VDA system functions by in-situ crosslink of the polymer, this occurs as the acid spends the pH of the fluid increases causing the polymer to complex, when the fluid completely spends the fluid system breaks back to very low viscosity fluid.


Aaron Shi

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