Simulation Study on Nitrogen Injection Performance For Jake Oil Field Reservoirs-Sudan as pressure support

Abstract

Nitrogen injection is one of enhance oil recover method that has been used widely over the world for decades and recently in Sudanese oilfields for gas lifting, reservoir pressure maintenance, huff & puff, and flooding. Nitrogen injection becomes economical effective, alternative than natural gas and carbon dioxide due to the law cost, increased extraction factor, and availability of nitrogen in addition to the many problems associated with other gas injection methods such as equipment corrosion as in carbon dioxide injection the price of natural gas that used to injection become more expensive. The Jake oilfield in block 6 located in west Kordofan State, the field reach the tertiary recovery stage thus reservoir pressure decrease with production life time, this work focus on the best simulation scenarios for pressure support by the injection nitrogen using five wells;(js-1) (js-4) (js-18) (js-22) (js-35), as well as using the current available data to simulate the best model. The wells were simulated using the GEM’s model and set the base case before to compare by nitrogen injection scenarios after, the result of the research work done indicated decrease after nitrogen injection in water cut by 42% and increase in both oil production rate and oil cumulative production rate by %43.4and 9.33 % respectively. Well18 in Jake south is high water cut well that reduce the entire field productivity therefore is converted to a nitrogen injection well to decrease the water cut ratio.