流体流变参数对低渗透油藏开发的影响和认识

The influence and understanding of rheological parameters in the development of low permeability oil reservoirs

低渗透油藏随着储层渗透率的减小,流体赖以流动的孔隙系统中微细孔隙体积的比例不断增大,使流体在流动中所受到的干扰更加严重,从而改变其渗流特性。本文运用流体流变学理论,研究测试流体流动通过特低渗透油藏的流变参数,建立径向渗流的数学方程,对比分析压力、产油量和含水率的变化规律,认为初始剪切应力对特低渗透油藏的开发有重要影响,并提出改善油藏开发效果的认识。

With the decrease in permeability of the low permeable reservoirs,the volumetric proportion of fine pores in porous medium systems through which the fluid flows will keep rising,which will result in more serious disturbance of the fluid flow so as to change the percolation characteristics of the fluid. Guided by the theory of fluid rheology,this paper has measured and studied the rheological parameters of fluid flow through a low permeable reservoir,formulated a radial percolation equation,compared and analyzed changeable laws of the pressure、oil production and water cut,and considered that the initial shearing stress has a significant influence on the development of ultra-low permeability reservoirs,and got some understandings on improving the effects of oil reservoir development.