Acid-Sensitive Aluminosilicates: Dissolution Kinetics and Fluid Selection for Matrix-Stimulation Treatments
- Ryan L. Hartman (U. of Michigan) | Bruno Lecerf (Schlumberger) | Wayne W. Frenier (Schlumberger) | Murtaza E. Ziauddin (Schlumberger) | H. Scott Fogler (U. of Michigan)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- May 2006
- Document Type
- Journal Paper
- 194 - 204
- 2006. Society of Petroleum Engineers
- 4.1.5 Processing Equipment, 1.6.9 Coring, Fishing, 1.8 Formation Damage, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 4.3.1 Hydrates, 3.2.4 Acidising, 5.2 Reservoir Fluid Dynamics, 4.1.2 Separation and Treating, 4.3.4 Scale
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Dissolution kinetics of analcime (a zeolite), chlorite, and illite (layered aluminosilicates) are examined in hydrochloric and mixtures of hydrochloric and hydrofluoric acid systems. Dissolution kinetics were determined from batch reactor experiments in the temperature range of 25 to 100°C. The reaction progress was monitored by analysis of Al, Si, Fe, Mg, and Na concentrations in the aqueous phase. The reactivity of these aluminosilicates was compared with that of kaolinite under similar experimental conditions.
Models for the reaction of the aluminosilicates with each acid are presented. The reaction kinetics incorporated into a geochemical simulator predict matrix-stimulation results for formations containing these minerals. Guidelines for design of matrix-stimulation treatments for acid-sensitive formations are formulated.
Sandstone acidizing is a complex operation because the treatment involves flow and reactions in porous media where the reactive chemicals can contact a wide range of minerals. The formation may contain various amounts of silica (SiO2), clays (aluminosilicates such as kaolinite or illite), or alkaline aluminosilicates such as feldspar and zeolites, as well as calcium and magnesium carbonates. Recent studies on matrix stimulation have strongly emphasized the importance of secondary and tertiary reactions in determining the success of matrix treatments (Gdanski 1996, 1997a). However, for acid-sensitive aluminosilicates, these reactions are especially important because they occur at much shorter time scales than for the nonacid-sensitive minerals. The presence of acid-sensitive aluminosilicates may dominate treatment design considerations, even though they may be present in small quantities compared to other aluminosilicates.
Appropriate selection of treatment fluids is key in preventing formation damage in presence of acid-sensitive aluminosilicates. However, the extent of secondary and tertiary reactions under reservoir conditions for each fluid and mineral is difficult to quantify with laboratory testing alone (Ziauddin et al. 2002a). In this study, a combination of laboratory testing and geochemical simulations have been used to elucidate the underlying reaction mechanisms for these minerals and to determine their impact on reservoir treatments.
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