油田经济极限井网密度的确定

Determination of economic limit for well pattern density of oilfield

井网加密是油田开发调整中最重要的措施之一。目前,我国东部大多数油田已处在高含水期,剩余油分布零星,挖潜难度大。除三次采油提高采收率方法外,采取的主要措施是层系细分和井网加密。根据投入、产出关系,求出经济极限单井累积产油量,进而求出经济极限井网密度。通过公式推导,结合油田实际数据,计算得出合理的极限井网密度,以指导油气生产,杜绝盲目钻井,避免勘探开发投资的浪费。

Well infilling is the most important program in oilfield development. At present, many oilfields in the east part of China are in the production stage of high water cut, and the remaining oil distributes discontinuously, which puts great difficulty on potential tapping. Besides the method of tertiary recovery, the main measure of EOR is layers subdivision and well infilling. Based on the relationship between input and output, cumulative oil production of single well with economic limit is calculated, and then well pattern density to the economic limit can be determined. Combining with actual data, this article has calculated reasonable economic limit for the well pattern density by derivating formula, which guides oil and gas production in order to eliminate aimless drilling and avoid the investment waste in the exploration and development.