INJECTIVITY DECLINE DUE TO CALCIUM CARBONATE SCALING
- Key words
- calcite scaling
- Conference
- Stanford Geothermal Workshop
- Year
- 2001
- Session
- Production/injection
- Language
- English
Full text
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Abstract
The purpose of this study is to investigate the effects of calcium carbonate scaling on the reservoir inflow performance experimentally and theoretically.
The linear core-flow experiments were conducted to study the flow impairment. Calcium carbonate solutions prepared at room conditions were injected into the Bentheim and Berea sandstone cores at elevated temperatures. Calcium carbonate precipitation occured in cores due to temperature difference between injected solution and core. The impact of precipitation in cores was evaluated on the basis of experimental results applying chemical analysis, pressure change across the core, thin section and SEM analysis.
A new analytical model was derived to predict the injectivity decline for linear core-flow experiments. Comparison of the experimental results with the results obtained from the analytical model proves the validity of the model.
This paper presents the analytical model and the preliminary results of the experimental work.
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