Volume 19: Sustainable Energy Solutions for a Post-COVID Recovery towards a Better Future: Part II

Gas Injection Development Scenarios and Forecasting for Tight Oil Energy Songchao Qi, Haiyang Yu, Jiabang Song, Jiang Hu, Yu Zhang, Xiaobing Han

Abstract

Tight oil energy occupies an increasingly important position for petroleum energy in the world. At present, most tight oil reservoirs have the problems of low formation pressure and difficult exploitation. Therefore, it is important to make reasonable management scenarios and forecasting for tight oil energy. Current research shows that natural gas flooding (NGF) can improve oil recovery for tight reservoirs, meanwhile, the oil field usually has abundant associated gas, which is suitable for natural gas flooding.
This paper mainly investigates NGF development for tight oil reservoirs in Ordos Basin, aiming to recycle the associated natural gas that has little commercial value to enhance oil recovery, and formulates reasonable development plan and forecasting. The PVT experiment is conducted to provide support for numerical simulation, which includes three parts: Firstly, the numerical model of tight reservoir is established. Then, sensitivity production parameters are analyzed. Finally, oil recovery and gas storage are studied.
The phase diagram of crude oil is obtained by PVT experiments, and the saturation-pressure line is obtained by composition model is well matched with the experimental data. Sensitivity analyses demonstrate that the recommended injection rate of single well is 4000-4500 m3/d and bottom hole pressure of production well is about 8 MPa. In the early stage of NGF, oil recovery is higher and gas storage effect is better, while oil recovery and gas storage effect are both poor in the later stage.
This paper is a combination of energy recycling and enhanced oil recovery. In this research, development scenarios and forecasting are applied in practical oil fields and provides support for subsequent development, which provides a reference for developing similar oil reservoirs. Meanwhile, it is expected that this research can be extended to the collaborative gas storage construction and oilfield development.

Keywords Energy management, energy development, scenarios and forecasting, enhanced oil recovery, energy recycling