Occidental Petroleum is planning to withdraw from the Zubair oil field project – the third international oil company to leave the country in the past three years.Multiple officials either involved in the Zubair project or familiar with the departure process have confirmed the exit is underway. Occidental’s exit appears to be part of a broader strategy, publicized by the company, to reduce its exposure to the region.The Oil Ministry has to formally sign off on the request and the 90-day p…