Suppressing frontal instabilities and stabilizing miscible displacements with time-dependent rates for improved oil recovery

Qingwang Yuan, Shuoshi Wang, Jinjie Wang, Fanhua Zeng, Kelvin D. Knorr, Muhammad Imran

Research output: Contribution to conferencePaper

Abstract

The frontal instabilities are a key control factor which can significantly affect the sweep efficiency and oil recovery in miscible flooding processes. Under unfavorable viscosity ratio between injection solvent and oil, the frontal instabilities are nearly unavoidable. However, how to suppress the instabilities, especially with low additional costs, should be carefully investigated. The present study examines the time-dependent displacement rates on flow instabilities in miscible flooding. Within the capacity of injection pumps, the injection rates are varied with time in a fast alternating manner. It is found that this kind of variable rates can stabilizing frontal instabilities by enhancing initial uniform mixing of solvent and oil. It therefore suppresses the later development of instabilities. Eventually, a much less unstable front is obtained when compared with the constant injection rate. Other parameters such as the amplitude of rates are also examined. The variations of propagation of front with time are analyzed for the change of rate strength. It is can therefore be concluded that this kind of time-dependent rate can improve oil recovery at very low additional rate within the capacity of pumps for the field EOR processes.

Original languageEnglish
DOIs
StatePublished - 2018
EventSPE Improved Oil Recovery Conference 2018 - Tulsa, United States
Duration: Apr 14 2018Apr 18 2018

Conference

ConferenceSPE Improved Oil Recovery Conference 2018
CountryUnited States
CityTulsa
Period04/14/1804/18/18

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    Yuan, Q., Wang, S., Wang, J., Zeng, F., Knorr, K. D., & Imran, M. (2018). Suppressing frontal instabilities and stabilizing miscible displacements with time-dependent rates for improved oil recovery. Paper presented at SPE Improved Oil Recovery Conference 2018, Tulsa, United States. https://doi.org/10.2118/190320-ms