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A new method of determining the starting pressure gradient in 10w permeability reservoir
Author(s): 
Pages: 80-81,84
Year: Issue:  5
Journal: PETROLEUM GEOLOGY AND ENGINEERING

Keyword:  低渗透储层启动压力梯度见效时间注水;
Abstract: 低渗透储层中流体渗流与中高渗储层相比最主要的特征是存在启动压力梯度.启动压力梯度目前大多采用岩心实验来测定,另外也可通过理论模型计算、数值模拟、试井分析等方法加以确定,但这些方法都是单纯地从静态角度予以考虑,离开了实际生产资料的矫正与检验,因此,得到的结果与实际启动压力梯度往往有较大出入.根据渗流理论和启动压力梯度规律,利用稳态逐次替换法,推导出了低渗透储层注水见效时间的预测公式.在此基础上,得到了根据低渗透储层注水见效时间计算启动压力梯度的表达式.实例计算表明,该方法得到的启动压力梯度是可信的,准确的,这为低渗透储层启动压力梯度的求取提供了一种新的方法.
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