Petroleum Research Petroleum Research 2019(October-November), Vol. 29, No. 107, 11-14 DOI: 10.22078/pr.2019.3312.2534 INTRODUCTION Most of the current world oil producton comes from mature reservoirs which faced oil producton decline problem. In additon, the rate of replacement of the produced reserves by new discoveries has been declining steadily [1]. Several enhanced oil recovery (EOR) methods including water fooding, solvent injecton and chemical injecton were applied to compensate oil producton decline problem. Generally, large volume of original oil in place (OOIP) is leaving un-swept in the reservoirs afer primary recovery period. Conventonal water fooding is a common method to produce extra oil which is applied as a secondary recovery method. But because of considerable diference between reservoir oil and injected water mobilites in heavy oil reservoirs, conventonal water fooding exhibited an insufcient performance [2]. Moreover, one of the possible solutons for improving the performance of conventonal water fooding is to add the Mutual Soluble Solvents (MSS) into the injected brine [3]. During recent years, applicaton of Dimethyl Ether (DME) as a mutual soluble solvent received more atenton in the EOR studies [4]. DME is the simplest alkyl ether, and is considered the isomer of ethanol which exists in the vapor phase at ambient conditon. However, it is liquefed at room temperature as the pressure increases. DME is colorless and almost non-toxic [5]. DME was chosen as a solvent agent because of its unique preference for miscibility in the oil, and its ability to be dissolved in water [6]. Through a Dimethyl Ether enhanced water fooding (DEW) process, an aqueous phase involving dissolved DME in brine is injected into the formaton. Modeling DME-Water Flooding and Feasibility Study of Using this Method for Enhanced Oil Recovery in the Condition of a Heavy Oil Reservoir Ghader Pelark, Mohammad Chahardowli* and Mohammad Simjoo Faculty of Petroleum and Natural Gas Engineering, Sahand University of Technology, Tabriz, Iran chahardowli@sut.ac.ir DOI: 10.22078/pr.2019.3312.2534 Received: September/04/2018 Accepted: March/03/2019