Dissolution kinetics of analcime (a zeolite ), chlorite, and illite (layered aluminosilicates) were determined in HCl and mixtures of HF acid systems. Analcime dissolved at a much higher (by an order of magnitude) rate than kaolin, chlorite, or illite in 15 wt % HCl or 9/1-mud acid. Mud acid treatments (9/1 and 12/3) for two formations were compared using batch reactor experiments and simulations with a validated geochemical model. The simulator was a valuable tool to extrapolate the experimental results in reservoir conditions over a broad range of temperature. The outputs showed the different effects of the acids and allowed the determination of the critical temperature for each treatment. 9/1-mud acid had a higher Tc (T = temperature, c = catalytic activity) than 12/3 mud acid, although 12/3 mud acid was more stimulating at low temperature when no zeolite was present. Acetic acid (10%) could be used without damaging the formation at higher temperature than HCl (10%). At low temperature, HCl 10% was more efficient in dissolving carbonates prior to the main stage. Based on the simulations, guidelines could be provided to optimize an acid treatment, and to avoid damaging the reservoir.
|Original language||English (US)|
|State||Published - 2003|
|Event||5th European Formation Damage Conference - The Hague, Netherlands|
Duration: May 13 2003 → May 14 2003
|Other||5th European Formation Damage Conference|
|Period||5/13/03 → 5/14/03|
ASJC Scopus subject areas