Experimental research on phase behaviour and vapour/liquid equilibrium of N₂ and heavy oil system
by Fangfang Li; Shenglai Yang; Changlin Shi; Weiying Yao; Wei Wu
International Journal of Petroleum Engineering (IJPE), Vol. 3, No. 2, 2018

Abstract: In the process of N₂ injection, the dissolution and diffusion of N₂ into oil will change the physical properties of crude oil and enhance oil recovery. In this paper, two experimental procedures are investigated to measure phase behaviour and equilibrium features of crude oil and injected N₂. The dynamic miscibility experiment was conducted to obtain N₂-oil phase behaviour and physical property change data, while the static miscibility experiment was conducted to simulate the vapour/liquid equilibrium process features. The result of dynamic miscibility experiment showed that it is difficult to achieve miscible displacement for N₂ injection due to the low solubility and low extraction capability of N₂; however, the solution of N₂ can reduce oil viscosity and IFT, and the high compressibility coefficient of N₂ can implement the displacement energy to obtain higher oil producing rate. The static miscibility result indicated that N₂ dissolved in crude oil through a contacting interface and then diffused in deeper part of oil, contacting time and equilibrium pressure are key influence parameters to vapour/liquid equilibrium features.

Online publication date: Wed, 11-Jul-2018

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