确定已开发油田采油井和注水井地层压力的简易方法

Simple method for determining reservoir pressure of producing oil well and injecting water well in developed oilfield

地层压力既影响到油井的产能,又影响到油田的采收率。已开发油田的地层压力既可以由采油井关井的压力恢复曲线确定,也可以通过注水井关井的压力降落曲线确定。Horner法仅适用于确定原始地层压力的探井和新井,MDH法不能直接用于确定油田的目前地层压力,在实际应用时,需要查找MDH法的无因次典型曲线。应用传统的MDH法,结合压力函数的应用,提出了确定已开发油田采油井和注水井地层压力的简易方法。实例应用对比表明,提供的方法是实用有效的。

For developed oilfields,reservoir pressure is a very important parameter influencing not only the productivity of oil wells but also the recovery efficiency of oilfield.The reservoir pressure of a developed oilfield can be determined not only by shut-in buildup curve for a producing well,but also by shut-in falloff curve of injecting water well.The famous Horner method can be only used to determine the initial reservoir pressure of exploration well and new well,while MDH（Miller-Dyes-Hutchison） method can not be directly used to determine the current reservoir pressure,which should be found dimensionless MDH type curve in practical application.With conventional MDH method,combined with application of pressure function,a simple method for determining reservoir pressure of producing oil well and injecting water well is proposed in this paper.The comparison of examples indicates that the method proposed in this paper is effective.