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Title: Chemical composition profiles during alkaline flooding at different temperatures and extended residence times

Abstract

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 inmore » 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.« less

Authors:
;
Publication Date:
Research Org.:
Univ. of Southern California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
6757634
Report Number(s):
DOE/BC/14600-36
ON: DE93000107
DOE Contract Number:  
FG22-90BC14600
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 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

Citation Formats

Aflaki, R., and Handy, L. L. Chemical composition profiles during alkaline flooding at different temperatures and extended residence times. United States: N. p., 1992. Web. doi:10.2172/6757634.
Aflaki, R., & Handy, L. L. Chemical composition profiles during alkaline flooding at different temperatures and extended residence times. United States. https://doi.org/10.2172/6757634
Aflaki, R., and Handy, L. L. 1992. "Chemical composition profiles during alkaline flooding at different temperatures and extended residence times". United States. https://doi.org/10.2172/6757634. https://www.osti.gov/servlets/purl/6757634.
@article{osti_6757634,
title = {Chemical composition profiles during alkaline flooding at different temperatures and extended residence times},
author = {Aflaki, R. and Handy, L. L.},
abstractNote = {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.},
doi = {10.2172/6757634},
url = {https://www.osti.gov/biblio/6757634}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 01 00:00:00 EST 1992},
month = {Tue Dec 01 00:00:00 EST 1992}
}