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Mohammad Chahardowli,Rouhi Farajzadeh,Hans Bruining 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.38 No.-
Injection of dimethyl ether (DME) dissolved in water can enhance the recovery efficiency with respect towater flooding. In this Shell Proprietary Technology, DME partitions from water into the oil; decreases oilviscosity and increases its volume, and mobilizes the trapped oil again. In this work, DME-enhancedwater flooding is combined with polymer and considered for cases in which a favorable mobility controlbetween water and oil does not exist. In order to reduce the remaining oil, slugs of the mixed solution ofDME and polymer were injected into the cores containing oil and then followed by injection of a chasefluid. This recovery method benefits both (a) from the presence of polymer, and the oil viscosityreduction caused by DME dissolution and (b) from oil swelling due to DME dissolution. It appears fromexperimental data that the injectivity of a DME/polymer (DMEP) solution is higher than the injectivity ofa polymer solution without DME; this indicates the presence of DME can reduce the viscosifying effect ofthe polymer. The main experimental observations are: (1) a higher oil recovery is obtained fromcontinuous DMEP flooding than from continuous DME–brine flooding, (2) the presence of polymer in theDME slug and in the chase phase reduced the remaining oil after a finite slug injection, and (3) a largerDME slug and mobility control of the chase phase can improve the oil recovery after a finite sluginjection. In summary, the experiments show that combining polymer and DME improves the ultimaterecovery significantly and shortens the duration of oil production.
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