Matrix acidizing in sandstone formations

Details Matrix acidizing in sandstone formations Matrix acidizing in sandstone formations

1992-12-22

1994-05-03

Suchfield, George A.

Wells

Processes

Specific low fluid loss feature for fluid attacking formation

166281, 166300, 166307, E21B 4326, E21B 4327

Patent

active

053078756

ABSTRACT:
A method for improved matrix acidizing of a sandstone formation containing a perforated well. Initially, a "pre-pad" and a temperature stable viscous gel pad are pumped into the formation via said well at injection pressures greater than 5 BPM while monitoring surface pressures. Next, an acid suitable for acidizing the formation is pumped into the formation while the injection pressure is maintained. Thereafter, additional stages of viscous pad and acid are pumped into the formation to ensure zonal coverage and acid-stimulation.

REFERENCES:
patent: 4007789 (1977-02-01), Clampitt
patent: 4237975 (1980-12-01), Scherubel
patent: 4322306 (1982-03-01), Dill
patent: 4787456 (1988-11-01), Jennings, Jr. et al.
patent: 4807703 (1989-02-01), Jennings, Jr.
patent: 4883124 (1989-11-01), Jennings, Jr.

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