油田聚合物产出液黏度的影响因素

Key factors of viscosity reduction of polymer brine produced fluid in oilfield

朱米家 张健 向问陶 尹先清 檀国荣 陈武

ZHU Mijia ZHANG Jian XIANG Wentao YIN Xianqing TAN Guorong CHEN Wu

长江大学化学与环境工程学院, 湖北荆州 434023; 海洋石油高效开发国家重点实验室, 北京 100027; 中海油研究总院, 北京 100027

College of Chemical and Environmental Engineering, Yangtze University, Jingzhou Hubei 434023, China; State Key Laboratory of Offshore Oil Exploitation, Beijing 100027, China; CNOOC Research Institute, Beijing 100027, China

三次采油含聚污水中残留HPAM的含量体现在采出液的黏度上,直接影响到含聚污水的处理。实验以乌氏黏度计法测量聚合物溶液的黏度下降率,通过对pH值、水质阴阳离子量、黏均分子量和剪切速率等相关因素的研究发现,渤海JZ9-3油田注聚用FP3640C型聚合物的溶液黏度在pH值2~4范围内影响明显,pH>7以后,黏度损失率减小;JZ9-3油田地层水中的Mg2+、Ca2+对聚合物的黏度影响显著;当离子浓度在2 500~4 000mg/L范围内,Na+和K+对黏度的降低有明显的影响;恒温60℃时,聚合物的黏度随着恒温时间的延长而下降,至30d后趋于稳定;剪切速率增加,黏度逐渐降低,转速达到8 000r/min后,黏度亦趋于稳定。

The residual HPAM manifested itself in the viscosity of polymer flooding produced liquid in the tertiary phase, the initial viscosity of polymer solution directly affects the impact of oil-bearing wastewater treatment. In this paper, viscosity reduction rate of polymer solution was measured by Ubbelohde viscometer. From the experimental study on related factors such as pH, content of anions and cations in the water quality, viscosity average molecular weight, and shear rate, the result of experiment suggested that viscosity of FP3640C polymer solution would be apparently reduced among pH 2~4, viscosity reduction rate of solution would be lower while pH>7; Mg2+,Ca2+ in JZ9-3 formation brine causes apparently reduction of viscosity; Na+, K+ could cause apparently reduction of viscosity while the concentration varied in the range from 2 500 to 4 000 mg/L; with the extension of the operation time under the temperature of 60℃ , viscosity of polymer solution would be reduced till the 30th days; viscosity of solution reduced with increasing shear rate, viscosity would be slowed down to a stable level while rotation speed reached 8 000 r/min.

国家科技重大专项《海上稠油化学驱油技术》(2008ZX05024-002)研究内容。

https://doi.org/10.3969/j.issn.1008-2336.2011.03.056