APPLICATIONS OF NITROGEN INJECTION IN OILFIELDS

Nitrogen injection has recently been used in some foreign fields as an alternative of natural gas injection or carbon dioxide injection. Nitrogen injection being used to enhance oil recovery in many oilfields, particularly in overthrust fault. Based on the comparative analyses among natural gas,Carbon dioxide and nitrogen in factors such as the cost of per cubic meter at field injection pressure, the possibility and reliability of long-term supply, the physical and chemical properties, the incremental cost for corrosion prevention and produced gas clean-up, and the impact of the Windfall Profit Tax,this paper presents a relative advantage of nitrogen injection. At the end of paper,it covers the applications of nitrogen in four nitrogen injection projects in Rocky mountains and provides the reservoir parameters,nitrogen injection rate and some prodicted results.