The Increasing trend of gas flaring over oil fields and gas process systems in Iran not only causes several environmental problems, but makes the economic resources useless as well. Considering the high amount of flaring and also old facilities in oilfields in Iran, one of the best solutions is the recovery of flare gas. It seems that collecting the flare gas is not possible in different sectors. Therefore, in this paper, the feasibility study of converting flare gas to methanol in small scale is discussed. As a result, a methanol plant is simulated; whose input feed is the content of oil field flare gas of Iran (Marun and Siri). The payback period and net present value are also appraised. The payback period is evaluated around 4 years for Siri and 6 years for Marun.