幂律流体在岩心中流变性测定的公式推导与应用

DERIVATION AND APPLICATIONS OF THE EQUATION FOR RHEOLOGY OF POWER LAW FLUID IN CORE

蒋明

Jiang Ming

石油大学北京石油工程系

随着化学驱油的室内试验和矿场试验的不断发展,有必要研究化学剂溶液在多孔介质中的流变性。推导了在岩心中测定幕律流体的流变性公式,并就公式作了定性分析:认为幂律流体的剪切速率和剪切应力与渗流速度、多孔介质的性质有关;剪切速率与流体性质有关,剪切应力与流体的流变指数无关。同时阐述了应用此公式计算流变性的计算过程及其在岩心驱替试验中的具体应用。鉴于幂律流体在多孔介质中还要受拉伸应力的影响,同时还要发生吸附、滞留等现象,用该方法得到的渗流规律具有一定的局限性。

With the uninterrupted development of indoor and field tests on chemical flooding, it is necessary for technical staff to study the rheology of chemical reagent in porous media. This paper introduces a equation for rheology of power law fluid. The conclusion from qualitative analysis on the equation is the shear rate and shear stress of power law fluid have something to do with percolation flow velocity and behavior of porous media, and the shear rate has something to do with fluid behavior and the shear stress nothing with rheological index of fluid. This paper is also introduces its application in core test. In view of the effect of tensile stress, adsorption and retention on power-law fluid in porous media, this equation has certain limitation.

10.3969/j.issn.1000-7393.1997.05.015