A mathematical model for the effect of shearing action on the apparent viscosity of polymer injected by a different medium injection tool

Huang Bin; Li Xiaohui; Fu Cheng; Wang Xin

doi:10.13809/j.cnki.cn32-1825/te.2018.05.008

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A mathematical model for the effect of shearing action on the apparent viscosity of polymer injected by a different medium injection tool
Vol. 8, Issue 5, Pages: 48-55(2018)
Published：2018
DOI： 10.13809/j.cnki.cn32-1825/te.2018.05.008
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DOI：

Huang Bin, Li Xiaohui, Fu Cheng, et al. A mathematical model for the effect of shearing action on the apparent viscosity of polymer injected by a different medium injection tool[J]. Petroleum Reservoir Evaluation and Development, 2018, 8(5): 48-55. DOI： 10.13809/j.cnki.cn32-1825/te.2018.05.008.

摘要

针对聚合物驱油过程中油层渗透率低、层间矛盾大而导致油层动用程度较低的问题

油田现场一般采用分注工具。分注工具包括分质工具和分压工具。为系统地反映分质工具剪切作用对聚合物溶液黏度的影响

建立了分质工具中注入聚合物表观黏度变化数学模型

并分析了分质工具结构参数和聚合物溶液的注入量对表观黏度的影响。结果表明：聚合物溶液的表观黏度随着分质工具收缩段长度、圆柱段半径、扩张段最大直径、扩张段长度的增大而增大;随着收缩段半径的增大而减小;分质工具圆管段长度对聚合物溶液的表观黏度大小无明显影响。聚合物溶液的表观黏度随着聚合物溶液注入量的增大而减小。计算结果可为工程实际需要进行优选分质工具结构参数提供理论参考依据。

Abstract

Aiming at the low production level of the oil layer caused by the reservoirs with low permeability and the large contradiction between oil layers

we commonly use different medium injection tools in the oil fields to realize the match of polymer injection and polymer molecular weight to the oil layer. In order to reflect the effect of shearing on viscosity of polymer solution when it across the interstitial injection tools

a mathematical model about the impact on polymer apparent viscosity affected by shearing was established

and the influence of the structural parameters of interstitial injection tools and injection volume on the apparent viscosity of polymer was analyzed. The results showed that the apparent viscosity of the polymer solution went up when the length of contractile section

radius of cylindrical section

maximum diameter of dilated section and length of dilated section increased

while the apparent viscosity of polymer solution went down when the radius of the contractile section increased. And the length of cylindrical section had no effect on the apparent viscosity of polymer solution. The apparent viscosity of polymer solution decreased when the injection volume of the polymer solution increased. The calculation results can provide a theoretical reference for optimizing the structural parameters of the different medium injection tool.