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低渗透砂岩油藏渗流启动压力梯度实验研究
引用本文:吕成远,王建,孙志刚. 低渗透砂岩油藏渗流启动压力梯度实验研究[J]. 石油勘探与开发, 2002, 29(2): 86-89
作者姓名:吕成远  王建  孙志刚
作者单位:中国石化胜利油田地质科学研究院
摘    要:实验测定了3个不同渗透率级别的低渗透砂岩油藏样品的非达西渗流曲线,采用“毛细管平衡法”与传统的“压差-流量法”相结合, 非达西渗流曲线的完整性。在每块实验样品的平均渗汉速度与单位黏度的驱替压力梯度的关系坐标中,利用二次函数拟合实验数据点,通过二次函数曲线切线的斜经和截距的变化来描述低速非达西渗流中岩心渗透经和启动压力梯工的变化,探讨了启动压力梯度与空气渗透率、流体黏、驱替压力梯度的关系以及低非达西渗流段的渗透率与空气渗透率和单位黏度的驱替压力梯工的关系,并回归得到了经验公式。根据“毛细管平衡法”测定的最小驱替压力梯度和“切线斜率法”确定的非线性渗流段最大驱替压力梯度绘制了流态判定应用图版。

关 键 词:低渗透砂岩油藏 渗流启动压力梯度 实验研究 非达西渗流 测定方法 经验公式
文章编号:1000-0747(2002)02-0086-04
修稿时间:2001-11-28

An experimental study on starting pressure gradient of fluids flow in low permeability sandstone porous media
LU Chengyuan,WANG Jian and SUN Zhigang. An experimental study on starting pressure gradient of fluids flow in low permeability sandstone porous media[J]. Petroleum Exploration and Development, 2002, 29(2): 86-89
Authors:LU Chengyuan  WANG Jian  SUN Zhigang
Affiliation:Shengli Oil Field, Sinopec,Shandong 257015, P. R. China;Shengli Oil Field, Sinopec,Shandong 257015, P. R. China;Shengli Oil Field, Sinopec,Shandong 257015, P. R. China
Abstract:This paper presents the laboratory methods to obtain the complete non-Darcy flow curves of different low permeability sandstone porous media. The study develops a new "capillary pressure equilibrium method" to measure the starting pressure gradient, combining well with the conventional "differential pressure-flow rate method". Meantime, the relationships between starting pressure gradient and fluid viscosity, displacement pressure or the air permeability of the sample cores, especially the characteristics of permeability change when flow rate is low, are described and discussed. According to the experiment results, this paper get some useful experience formulae as well as applied plots.
Keywords:starting pressure gradient  non-Darcy flow  measurement methods  empirical formula
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