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Title: In situ gels improve formation acidizing

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.
Authors:
;  [1]
  1. Halliburton Energy Services, Duncan, OK (United States)
Publication Date:
OSTI Identifier:
423114
Resource Type:
Journal Article
Resource Relation:
Journal Name: Oil and Gas Journal; Journal Volume: 95; Journal Issue: 3; Other Information: PBD: 20 Jan 1997
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; OIL WELLS; ACIDIZATION; FRACTURING FLUIDS; IN-SITU PROCESSING; WELL STIMULATION; VISCOSITY; PRODUCTIVITY