Chemical composition profiles during alkaline flooding at different temperatures and extended residence times
The objective of this work was to investigate whether or not caustic sweeps the major portion of the reservoir efficiently during an alkaline flood process. It was also the objective of this work to study the state of final equilibrium during a caustic flood through determination of the pH and chemical composition profiles along the porous medium. For this purpose, a long porous medium which provided extended residence times was required. It was necessary to set up the porous medium such that the changes in the pH and chemical composition of the solution could be monitored. Four Berea sandstone cores (8 in. length and1 in. diameter) placed in series provided the desired length and the opportunity for sampling in-between cores. This enabled establishment of pH and chemical composition profiles. The experiments were run at, temperatures up.to 180[degrees]C, and the flow rates varied from 4.8 to 0.2 ft/day. The samples were analyzed for pH and for Si and Al concentrations.The results show that caustic consumption is insignificant for temperatures up to 100[degrees]C. Above 100[degrees]C consumption increases and is accompanied by a significant decrease in pH. The sharp decline in pH also coincides with a sharp decline in concentration of silica in solution. The results also show that alumina is removed from the solution and solubility of alumina ultimately reaches zero. Sharp silica and pH declines take place even in the absence of any alumina in solution. As a result, removal of silica from solution is attributed to the irreversible caustic/rock interaction. This interaction is in the form of chemisorption reactions in which silica is adsorbed onto the rock surface consuming hydroxyl ion. Once these reactions were satisfied, caustic breakthrough occurs at a high pH. However, significant pore volumes of caustic must be injected for completion of the chemisorption.
- Research Organization:
- Univ. of Southern California, Los Angeles, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-90BC14600
- OSTI ID:
- 6757634
- Report Number(s):
- DOE/BC/14600-36; ON: DE93000107
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CAUSTIC FLOODING
BENCH-SCALE EXPERIMENTS
DISPLACEMENT FLUIDS
ROCK-FLUID INTERACTIONS
SANDSTONES
SILICON OXIDES
CHEMISORPTION
ALUMINIUM OXIDES
CHEMICAL COMPOSITION
DRILL CORES
ENHANCED RECOVERY
EXPERIMENTAL DATA
OIL WELLS
PETROLEUM
PH VALUE
POROUS MATERIALS
SWEEP EFFICIENCY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
ENERGY SOURCES
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUELS
INFORMATION
MATERIALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES
SILICON COMPOUNDS
SORPTION
TEMPERATURE RANGE
WATERFLOODING
WELLS
020300* - Petroleum- Drilling & Production