低渗透砂岩渗流启动压力梯度研究进展

低渗透油田已逐步成为国内投入开发的主力战场,而启动压力梯度的研究是低渗透油藏渗流规律研究的关键所在,本文对低渗透油层渗流启动压力梯度研究成果就行了总结,明确了启动压力梯度确定方法,包括室内物理实验模拟方法、数值实验方法、试井解释方法;对比了近年来对于启动压力梯度实验研究的几个重要成果,总结得出了低渗透油藏＂毛细管平衡法＂和＂压差-流量法＂及稳态法和非稳态法的应用,并对其方法的模型及实验装置图进行了简单的总结介绍,为低渗透油藏启动压力梯度研究提供依据。

The Advance of Research on Starting Pressure Gradient in Low-Permeability Sandstone Flow

Low-permeability oil fields have gradually become the main battlefield to invest in developing,and the starting pressure gradient is the key of study on low-permeability reservoirs flow.This paper summarizes the research of starting pressure gradient in low-permeability reservoirs,defining the determine methods of starting pressure gradient,including simulation of indoor physical experiments,numerical experimental methods and test interpretation methods;Contrast to several important results of the starting pressure gradient experimental study in recent years,the application of ＂capillary balance method＂,＂pressure-flow rate method＂,the steady-state and non-steady state method have been summarized.Besides,the model of methods and the experimental device have been briefly introduced,which provide the basis for starting pressure gradient in low-permeability reservoir studies.