Abstract: The coiled tubing(CT) running system, reel and depth measurement system, well control equipment, nitrogen pumping unit and flow back package are introduced, and mechanism of nitrogen lifting and key points of operation are presented. In order to raise lifting efficiency and avoid pollution to reservoirs, two aspects should be paid attention to in operation: first is to start pumping nitrogen at a relatively low depth while running coiled tubing in, the second is coiled tubing depth should not exceed 20m below the top of perforation intervals. The application of coiled tubing standard operation procedures of nitrogen lifting in Rumaila can reduce operation risk, and normalize the management of coiled tubing service company. As the most prevailing means to put new wells or stimulation wells or shut-in wells back on production in Rumaila Oilfield, nitrogen lifting through coiled tubing can be better understood through the analysis of the case of Well Ru-406.