This thesis evaluates asphaltene deposition and damage during an intermittent waterflood process by use of the Eclipse 300 compositional reservoir simulator by Schlumberger. This intermittent waterflood is conducted in order to create a re-pressurization effect in the reservoir where the producer and injector are open at different time intervals. This study involves the optimization of certain operational parameters by a sensitivity analysis. The parameters inspected during this study are the injection rate, injection time, and reservoir shut-in time. A traditional (conventional) waterflood process is compared to the intermittent process in order to evaluate the differences in asphaltene deposition following the sensitivity analyses.
The results of the study indicate that asphaltene deposition and damage decreases as distance from the producer increases. This can be attributed to convergence of streamlines as the oil phase flows towards the producer along with the effects of pressure drawdown. The shut-in time sensitivity indicates that the producer should be opened immediately following the intermittent waterflood to benefit economic feasibility since negligible changes in deposition are expected to occur. The injection rate sensitivity indicates that higher rates are preferred. Temperature, drag, and fluid migration effects are considered to contribute to the observed results. The injection time analysis shows that earlier injection times are preferred because they re-stabilize the reservoir fluid more effectively. The mitigation of compositional change may contribute to this effect. Intermittent waterflooding is shown to have a drastic decrease in asphaltene deposition by comparison of a traditional waterflood case.
|Commitee:||Feng, Yin, Seibi, Abdennour|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 56/05M(E), Masters Abstracts International|
|Subjects:||Engineering, Petroleum engineering|
|Keywords:||Asphaltene, Intermittent, Waterflood|
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