Shahab Ayatollahi - Associate Professor, Department of Chemical Engineering-Shiraz University
Mohammad Ghasemi - B.S.C. Student , Department of Chemical Engineering-Shiraz University
Mohammadsadegh Tavallali - B.S.c Student , Department of Chemical Engineering-Shiraz University

Economical and political importance of oil has forced human towards finding better ways to enhance the amount of oil recovery. One may try to recover oil, regard all parameters of the reservoir but not one of the surface parameters i.e. the separators which separate oil from dissolved gas and bring it into standard conditions .The goal of this article is to examine the effect of pressure drop and the number of separators, on oil formation volume factor ( Bo ).It's obvious that you may receive one stock tank barrel by transferring 1.2 reservoir barrel in the reservoir, but by a good research and setting you may receive the same but transferring 1.1 reservoir barrel ,which means more money can be gained in the history of reservoir. We did this simulation by using HYSYS 3.01 and EXCEL softwares, and showed that the ratio of "oil production with n separator"/"oil production with 1 separator increases for n = 3 & 4. Also Bo V.S. DP diagram was obtained in this article