Membrane separation nitrogen generation technology is a new type of air separation technology with high efficiency, energy saving and simple operation, and membrane separation nitrogen generators have been widely promoted and applied in the field of oil and gas recovery. The core working principle of membrane separation is to use the difference in dissolution and diffusion speed of different gas molecules in polymer membrane materials. Under the action of pressure difference, oxygen, water vapor and other fast permeable gases pass through the membrane fiber and are discharged, while nitrogen molecules with slow permeation speed are intercepted and gathered to form high-purity nitrogen. This technology has the advantages of no moving parts, no switching vibration and ultra-stable operation, which is very suitable for the continuous working conditions of oil and gas recovery projects.

In the oil and gas recovery process, membrane separation nitrogen generators mainly provide inert nitrogen gas for oil tank nitrogen sealing, oil and gas pipeline purging, and volatile oil and gas recovery protection. In the oil storage tank area, continuous nitrogen filling is used to maintain positive pressure inside the tank, isolate air and moisture, prevent crude oil and refined oil from oxidation and volatilization loss, and reduce the emission of volatile organic compounds. At the same time, nitrogen inerting can eliminate the explosion risk of mixed oil and gas in the tank, improving the safety of oil storage and transportation. In the oil and gas pipeline maintenance and recovery operation, nitrogen is used to replace the oil and gas medium in the pipeline, avoiding the safety hazards of oil and gas leakage and combustion and explosion.

The application advantages of membrane separation nitrogen generators in oil and gas recovery are prominent. Compared with PSA nitrogen generators, membrane separation equipment has no periodic switching action, no pressure fluctuation in gas supply, more stable operation, lower failure rate, and almost no maintenance cost in the later stage. The equipment has a fast start-up speed, can realize instantaneous gas production, and supports 24-hour uninterrupted continuous operation, adapting to the long-term continuous operation demand of oil and gas fields and oil depots. In addition, the membrane separation equipment has strong environmental adaptability, can operate stably in harsh environments such as high temperature, low temperature and high dust in oil and gas fields, and has high safety and economy, which effectively improves the recovery rate of oil and gas resources and reduces environmental pollution and safety risks.