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低渗透油藏普遍存在启动压力梯度,地下流体表现非达西渗流特征,对油田生产具有一定的影响。目前确定启动压力梯度常用方法是利用室内岩心分析或者试井资料来确定,但这两种方法存在测试资料少、测试费用高等问题。本文利用水驱特征曲线反推启动压力梯度,具有快速简便的特点,经过验证,可靠性较高,应用效果较好。
The low-permeability reservoirs generally have a start-up pressure gradient, and the subsurface fluids show non-Darcy flow characteristics, which have a certain impact on oilfield production. At present, the common method of determining the starting pressure gradient is to use the indoor core analysis or well test data to determine, but these two methods have the problems of less testing data and higher testing cost. In this paper, using the water drive characteristic curve to reverse start-up the pressure gradient, which has the characteristics of quick and easy. After verification, the reliability is higher and the application effect is better.