Analysis of the impact of CO₂ content on the physical properties of the liquid phase mixtures in oil production wells
by Jiaming Zhang; Xiaodong Wu; Zhangxin Chen; Jingyao Wang; Zongxiao Ren
International Journal of Global Warming (IJGW), Vol. 12, No. 2, 2017

Abstract: CO₂ injection not only enhances oil recovery dramatically, but it also has a potential to reduce the greenhouse effect. During the process of CO₂ displacement, when CO₂ breaks through in oil production wells, CO₂ content will impact the phase state and physical properties of the liquid phase mixture in wellbore. As a result, it will affect the calculation of temperature and pressure in oil production wells. Therefore, it is unacceptable to use the conventional black-oil model for calculating the phase state of miscible fluids. For dealing with this problem, we use a gas-liquid flash theory and a compositional model to develop a new model. The Jilin oilfield is used as a case study; the phase state (gas, liquid or gas-liquid) and physical properties of the liquid phase mixture (including CO₂ and hydrocarbons) under initial conditions are calculated by this new model. The results indicate that the molar content of CO₂ has a great impact on the physical properties of the liquid phase mixture in oil production wells under certain temperature and pressure. A scientific guide for the calculation of temperature and pressure in oil production wells can be provided with the developed model.

Online publication date: Mon, 12-Jun-2017

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