涠四段油藏注天然气开发油藏模拟器优化

Reservoir Simulator Optimization in Weisi Reservoir Development by Natural Gas Injection

涠洲12-1油田涠四段油藏是国内海上第一个注天然气开发的油田。油藏构造倾角20°左右,利用油气重力分异作用,方案设计在油藏的高部位注气,低部位采油。注气恢复地层压力5MPa后采油,开发方式为非混相驱。经过组分模型与黑油模型模拟该油藏的二维剖面和油藏三维地质模型后,对比分析模拟结果,选择了黑油模型模拟油藏的非均质因素对注气开发效果的敏感性,以及模拟预测了注气非混相驱的开发方案,而没有使用混相驱工程中常用的组分模型。

Weisi reservoir in Weizhou 12 - 1 oilfield is the first offshore oilfield driven by natural gas injection in our country. Reservoir structure＇s dip is about 20°, and oil and gas gravitational differentiation is used, the scheme about injecting gas at high position and producing oil at low position is designed, after formation pressure buildups 5MPa by gas injection, ail is began to be produced, and development mode is immiscible flooding. Using compositional model and black - oil model simulates 2 - D profde and 3 - D geology model of the reservoir, after comparing to simulation results, black - oil model is selected to simulate the sensitivity of reservoir heterogeneity to development effect and predict the development scheme of immiscible displacement by gas injection. Instead, compositional model commonly used in miscible displacement engineering is not adopted.