油藏数值模拟在任丘雾迷山组油藏开发中的应用

本文介绍任丘油田研究、改进和应用碳酸盐岩底水油藏数值模拟的经验和效果。油藏模型改进的方面有:将三维双重介质油水两相数学模型改为二维平面空间模型;用多边形差分网格代替传统的矩形差分网格;模型能自动进行历史拟合。应用数值模拟在任丘雾迷山组油藏开发中起到科学指导的作用:单井水锥数值模拟用于研究水锥形成和发展的过程、采油速度和油井打开程度。全油藏数值模拟用于研究合理井网、布井方式、对比开发方案、分析油田动态及措施效果、测算可采储量等。在历史拟合的基础上可以进一步细致的研究油层、了解地下参数的分布和油水界面的分布,优选加密井和调整开发方案。

APPLICATION OF RESERVOIR NUMERICAL SIMULATION IN THE DEVELOPMENT OF WUMISHAN RESERVOIR,RENQIU OIL FIELD

Renqiu Oil Field is the largest carbonate buried hill oil field in China. It was discovered in July, 1975 and put on production in 1976. The pay zone is Wumishan dolomite formation, Jixian system, Lower Proterozoic. This is a fractured carbonate massive reservoir with bottom water. Up to 1988, 82% of the recoverable reserve has been produced. All of the producers produce both oil and water currently and the overall water cut of the whole field reaches 82.6%. The reservoir has come to its last stage of development, marked by a rapid decrease of oil output. A coning model of dual media was used to study the process of the formation and development of the water cone, the reasonable recovery rate and the degree of penetration of the pay zone. Since 1980 a three-dimensional dual medium water-oil two phase simulator has been put to use. Based on the result of history matching, we studied the reasonable pattern, optimum locations of in-fill wells, various adjustment programs and analyzed the performance of the reservoir and the rise of the oil water contact, and studied the effect of water blocking and predicted the recoverable reserve.