Reaction of sodium hydroxide with silicate minerals
The reactions of individual silicate minerals with caustic solution were measured over a 1-week period. These silicate minerals included: two feldspars (microcline and albite), two micas (biotite and muscovite), and three clays (chlorite, Kaolinite and montmorillonite). Bottle tests were conducted at 24/sup 0/ and 70/sup 0/C using three different sodium hydroxide concentrations: 0.01, 0.1, and 1 equiv/dm/sup 3/. Changes in the concentrations of the following aqueous species were monitored with time: sodium, silicate, aluminate, and hydroxide. Experimental results show that all of the silicate minerals cited above dissolve in caustic solution, but the extent of dissolution varies from one mineral to another. The extent of dissolution increases with increasing pH and temperature. Caustic consumption by kaolinite was observed: 1.0 N NaOH solution was found to precipitate at 0.03 equiv/(kg kaolinite)/h when mixed with kaolinite at 70/sup 0/C. Caustic solution was injected through a Berea core, and silicate and aluminate were observed in the effluent, indicating silicate-mineral dissolution in a flowing mode. A model was developed to predict the kinetics of caustic consumption by a mixture of three minerals: quartz, kaolinite, and phillipsite. The model illustrates mineral dissolution and precipitation in a simplified system without including all of the known reservoir minerals. With knowledge of the reaction kinetics between sodium hydroxide and individual silicate minerals, one can extrapolate caustic consumption data beyond the laboratory time scale to the time scale of oilfield operations. Implications of the kinetic model to alkaline flooding are discussed. 18 refs., 3 figs., 21 tabs.
- Research Organization:
- National Inst. for Petroleum and Energy Research, Bartlesville, OK (USA)
- DOE Contract Number:
- FC22-83FE60149
- OSTI ID:
- 6112647
- Report Number(s):
- NIPER-129; ON: DE86000275
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALBITE
DISSOLUTION
BIOTITE
CAUSTIC FLOODING
CHEMISTRY
CHLORITE MINERALS
KAOLINITE
MICROCLINE
MONTMORILLONITE
MUSCOVITE
SODIUM HYDROXIDES
CHEMICAL REACTIONS
BENCH-SCALE EXPERIMENTS
CHEMICAL REACTION KINETICS
EXPERIMENTAL DATA
MEDIUM TEMPERATURE
OIL WELLS
PH VALUE
PRECIPITATION
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CLAYS
DATA
FELDSPARS
FLUID INJECTION
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
MICA
MINERALS
NUMERICAL DATA
OXYGEN COMPOUNDS
REACTION KINETICS
SEPARATION PROCESSES
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SODIUM COMPOUNDS
WATERFLOODING
WELLS
020300* - Petroleum- Drilling & Production
400201 - Chemical & Physicochemical Properties