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Modeling CO_2 miscible flooding for enhanced oil recovery

Petroleum Science 2012年第2期9卷 192-198页

作者： Ju Binshan Wu Yu-Shu Qin Jishun Fan Tailiang Li Zhiping School of Energy Resources China University of Geosciences(Beijing)Beijing100083China Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism Ministry of EducationChinaUniversity of Geosciences(Beijing)Beijing 100083China Colorado School of Mines USA PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083China

The injection of fuel-generated CO2 into oil reservoirs will lead to two benefits in both enhanced oil recovery （EOR） and the reduction in atmospheric emission of CO2. To get an insight into CO2 miscible flooding performance in oil reservoirs, a multi-compositional non-isothermal CO2 miscible flooding mathematical model is developed. The convection and diffusion of CO2-hydrocarbon mixtures in multiphase fluids in reservoirs, mass transfer between CO2 and crude, and formation damages caused by asphaltene precipitation are fully considered in the model. The governing equations are discretized in space using the integral finite difference method. The Newton-Raphson iterative technique was used to solve the nonlinear equation systems of mass and energy conservation. A numerical simulator, in which regular grids and irregular grids are optional, was developed for predicting CO2 miscible flooding processes. Two examples of one-dimensional （1D） regular and three-dimensional （3D） rectangle and polygonal grids are designed to demonstrate the functions of the simulator. Experimental data validate the developed simulator by comparison with 1D simulation results. The applications of the simulator indicate that it is feasible for predicting CO2 flooding in oil reservoirs for EOR.

关键词： Compositional simulator CO2 flooding mathematical model irregular grids

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Numerical study of detonation shock dynamics using generalized finite difference method

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Science China(Physics,Mechanics & Astronomy) 2011年第10期54卷 1883-1888页

作者： CHEN YongLi HUANG KuiBang YU Xin Institute of Applied Physics and Computational Mathematics Beijing 100094 China

The generalized finite difference method (GFDM) used for irregular grids is first introduced into the numerical study of thelevel set equation, which is coupled with the theory of detonation shock dynamics (DSD) describing the propagation of thedetonation shock front. The numerical results of a rate-stick problem, a converging channel problem and an arc channel prob-lem for specified boundaries show that GFDM is effective on solving the level set equation in the irregular geometrical *** arrival time and the normal velocity distribution of the detonation shock front of these problems can then be obtainedconveniently with this method. The numerical results also confirm that when there is a curvature effect, the theory of DSDmust be considered for the propagation of detonation shock surface, while classic Huygens construction is not suitable anymore.

关键词： generalized finite difference method detonation shock dynamics level set equation propagation of detonation shockfront irregular grids

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