In situ gels improve formation acidizing
- Halliburton Energy Services, Duncan, OK (United States)
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 2.5--6 fold. In carbonate formation fracture-acidizing, these acids have shown production improvements of 170 to 375%. VCA acid can be used in both cased or open hole, in vertical or deviated/horizontal wells.
- OSTI ID:
- 423114
- Journal Information:
- Oil and Gas Journal, Vol. 95, Issue 3; Other Information: PBD: 20 Jan 1997
- Country of Publication:
- United States
- Language:
- English
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