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• W2090955782 abstract "Abstract Chemical EOR can be a very efficient enhanced oil recovery method when properly designed, but specialized laboratory tests must be done to tailor it to the specific reservoir fluids and mineralogy. The final step in the laboratory evaluation process is to test the chemicals in reservoir cores under reservoir conditions. Unfortunately, available reservoir cores are typically not in their native state. In particular, they are usually in a highly oxidized state (high Eh) compared to the reservoir formation. The oxidation state of the minerals affects the surfactants and polymers used for chemical EOR. In particular, at high Eh some of the iron-containing minerals may have surficial ferric ions that were originally ferrous under the low Eh conditions in the reservoir. Ferric ions can cause polymer degradation, poor polymer transport, and increased surfactant adsorption to the matrix, among other problems contributing to lower oil recovery. In general, to obtain valid test results, such cores must be restored to reservoir conditions to ensure valid results from core floods. We have investigated methods suitable for removing these ferric ions and restoring the core to reservoir condition. The new restoration method described in this paper dramatically improved polymer transport, reduced polymer and surfactant retention, and improved the oil recovery performance by the chemicals in several core floods. It should also be considered for other types of core floods to avoid getting laboratory results that are not representative of the behavior in the actual reservoir, which is in a reduced oxidation state compared to old cores." @default.
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• W2090955782 date "2014-04-12" @default.
• W2090955782 modified "2023-10-14" @default.
• W2090955782 title "Restoration of Reservoir Cores to Reservoir Condition before Chemical Flooding Tests" @default.
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• W2090955782 doi "https://doi.org/10.2118/169887-ms" @default.
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