Study of numerical simulation method modelling gas injection into fractured reservoirs

Z. Yun¹, S. Jianfang¹, L. Zhongchun¹

¹Sinopec Petroleum Exploration and Production Research Institute, Beijing, China

Min. miner. depos. 2019, 13(2):41-45

https://doi.org/10.33271/mining13.02.045

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ABSTRACT

Purpose. Fractures are the main flow channels in fractured reservoirs. The rapid flow characteristics of gas are outstanding in fractures. It is a major technical problem in the current oilfield development to calculate and accurately describe the fluid flow of this type of reservoir.

Methods. This paper improves the calculation model of oil-water-gas phase equilibrium. Based on the discrete fracture net-work model, the numerical simulation mathematical model, numerical model and solution method of nitrogen injection were established.

Findings. A simple discrete fracture network model was designed. Numerical simulations verify the correctness of the method.

Originality.A fast solution method for gas injection numerical simulation based on discrete crack network model is proposed.

Practical implications. The fractured reservoir numerical simulation method can accurately describe the flow of oil, water and gas in the fracture, which lays a foundation for the gas injection development mechanism and gas injection optimization research.

Keywords: fractured reservoir, numerical simulation, discrete fracture network model, gas injection

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