渤海天然能量开发砂岩油藏采收率经验公式研究

Research about Empirical Formula of Recovery Efficiency for Natural Depletion Development of Sandstone Reservoir at Bohai Oilfield

采收率是评价一个油田开发效果的重要参数,目前,对注水开发砂岩油田、稠油热采及底水碳酸盐岩油藏的采收率预测方法做了较多的总结和较深入的研究,但是,对于天然能量开发的砂岩油藏采收率预测方法研究较少。分析了影响天然能量开发砂岩油藏采收率的主要因素,重点分析了油藏的流度、储层的变异系数及井网密度对采收率的影响,采用多元回归方法建立了采收率的预测公式,利用渤海砂岩油藏天然能量开发的实例对回归的经验公式进行了验证。结果表明:所建立的预测公式在计算海上天然能量开发砂岩油藏采收率方面具有较高的精度,将为今后海上天然能量开发砂岩油藏的开发评价、编制开发方案提供可靠依据。

Recovery efficiency is an important parameter for evaluation of oilfield development efficiency. At present, prediction methods of recovery efficiency for water flooding of sandstone oil field, the thermal recovery of heavy oil reservoir are studied more and deeper. There are not many studies about the prediction methods of recovery efficiency for natural depletion development of sandstone reservoir. This paper analyzes the main factors influencing natural depletion sandstone oil recovery, and the impact of mobility of reservoir, the coefficient of variation of reservoir and well spacing density on recovery efficiency were analyzed. Prediction formula of recovery efficiency is set up using multiple regression method, and the example of natural depletion development for bohai sandstone reservoir is verified to the regression empirical formula. The result shows that the established prediction formula has high accuracy in calculating the recovery efficiency for natural depletion development of sandstone reservoir. It will provide reliable basis of development evaluation and development program for the natural depletion development of sandstone reservoir at sea.