稠油油藏热力–化学复合驱开发规划研究

A DEVELOPMENT PLANNING STUDY ON THERMAL-CHEMICAL COMBINED FLOODING FOR HEAVY OIL

在稠油注蒸汽热采过程中添加表面活性物质,可以提高热采的开发效果,在油田现场已得到初步应用。采用理论分析与数值模拟相结合的方式对这种强化采油方法进行研究,通过分析稠油油藏热采添加表面活性剂复合驱过程中主要物理化学现象,建立了比较完整的热力–化学复合驱数学模型。为提高热力–化学复合驱稠油开发的经济效益,利用稠油热采注采关系和油藏数值模拟方法,建立了稠油不同开发阶段生产动态的预测模型;应用非线性规划理论,对稠油前期蒸汽驱、后期复合驱开发进行整体规划研究;运用自适应遗传算法对具体稠油油藏复合驱开发非线性规划模型进行分析计算。结果表明:规划后的稠油复合驱开发可以获得更大的经济效益。

The thermal-surfactant combined flooding is an effective EOR technique for heavy oil reservoirs,which has been applied in several oilfields for pilot tests. A theoretical study on this technique is conducted by means of analytical analysis and numerical simulation. A comparatively complete thermal-chemical flooding mathematic model is built based on the dominant physical and chemical phenomena occurred during this combined flooding, and a 3D three-phase simulator is developed correspondingly. To improve the economic benefits of such a combined flooding,prediction models of different development stages are set up by means of injector-producer correlationship analysis and numerical reservoir simulation. Then,the non-linear programming theory is employed to perform integrated programming for heavy oil reservoirs in the situation where steam flooding is initially adopted and a combined flooding is adopted at later stages. The self-adapting genetic algorithm is used for model solution,the results of which indicate that a programmed combined flooding can lead to better economic benefits.