In situ gels improve formation acidizing

Valerie Yeager, Chris Shuchart Halliburton Energy Services Duncan, Okla. Viscosity-controlled acid effectively improves acid placement, provides more uniform damage removal, improves surface etching, and controls acid fluid loss. Viscosity-controlled acid (VCA) contains gels that break back to original viscosity 1 day after being pumped. These acids have been used for: Matrix-acidizing long horizontal and vertical well intervals Controlling fluid loss in fracture acidizing to obtain longer fractures and deeper live-acid penetration. Fluid pH controls gel formation and breaking. In one operator's horizontal wells, viscosity-controlled acid increased production by ...

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