Rheological behavior of hydrolyzed polyacrylamide solution flowing through a molecular weight adjusting device with porous medium

doi:10.1016/j.cjche.2015.12.013

Chinese Journal of Chemical Engineering ›› 2016, Vol. 24 ›› Issue (5): 581-587.DOI: 10.1016/j.cjche.2015.12.013

• 第25届中国过程控制会议专栏 • 上一篇下一篇

Rheological behavior of hydrolyzed polyacrylamide solution flowing through a molecular weight adjusting device with porous medium

Lühong Zhang¹, Jiangtao Wang^1,2, Yuqi Zhang¹, Bin Jiang^1,3, Xiaoming Xiao^1,2, Li Hao¹

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China;
3 National Engineering Research Center for Distillation Technology, Tianjin 300072, China

收稿日期:2014-12-22 修回日期:2015-09-04 出版日期:2016-05-28 发布日期:2016-06-14
通讯作者: Xiaoming Xiao
基金资助:
Supported by the Program for Yangtse River Scholars and Innovative Research Terms in Universities (IRT0936), the National Basic Research Program of China (2009CB219905, 2009CB219907), and the Daqing Oilfield Co., Ltd.

Rheological behavior of hydrolyzed polyacrylamide solution flowing through a molecular weight adjusting device with porous medium

Lühong Zhang¹, Jiangtao Wang^1,2, Yuqi Zhang¹, Bin Jiang^1,3, Xiaoming Xiao^1,2, Li Hao¹

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China;
3 National Engineering Research Center for Distillation Technology, Tianjin 300072, China

Received:2014-12-22 Revised:2015-09-04 Online:2016-05-28 Published:2016-06-14
Contact: Xiaoming Xiao
Supported by:
Supported by the Program for Yangtse River Scholars and Innovative Research Terms in Universities (IRT0936), the National Basic Research Program of China (2009CB219905, 2009CB219907), and the Daqing Oilfield Co., Ltd.

摘要/Abstract

摘要： The separate-layer injection in different interlayers and the injection of the same-molecular-weight polymer solution in a layer are necessary in the polymer flooding process because of heterogeneous multilayer sandstone reservoirs in EOR projects. To alleviate the matching problems between the layer permeability and the injected polymer molecular weight, a molecular weight adjusting device with porous medium was designed on the basis of mechanical degradation principle. In terms of four variables (polymer concentration, pore diameter, length of shear component and flow rate), the rheological behavior of hydrolyzed polyacrylamide (HPAM) solution flowing through the device was investigated in detail. The change of these variables is able to control the shear rate of HPAM solutions through ceramic foam, and achieve the desired degree of shear degradation and the final rheological parameters-viscosity loss, viscoelasticity and pressure drop. Therefore, a linear relationship between viscosity loss and shearing ratewas established so as to obtain the targeted viscosity easily. Field tests in the Daqing Oil Field showed that the polymer molecular weight could drop 20% to 50%. In a word, the results could guide the industrial application of the novel device and the further study of polymer degradation flowing through the porous medium.

关键词: Molecular weight adjusting device, Polymer solution, Rheological behavior, Mechanical degradation, Porous medium

Abstract: The separate-layer injection in different interlayers and the injection of the same-molecular-weight polymer solution in a layer are necessary in the polymer flooding process because of heterogeneous multilayer sandstone reservoirs in EOR projects. To alleviate the matching problems between the layer permeability and the injected polymer molecular weight, a molecular weight adjusting device with porous medium was designed on the basis of mechanical degradation principle. In terms of four variables (polymer concentration, pore diameter, length of shear component and flow rate), the rheological behavior of hydrolyzed polyacrylamide (HPAM) solution flowing through the device was investigated in detail. The change of these variables is able to control the shear rate of HPAM solutions through ceramic foam, and achieve the desired degree of shear degradation and the final rheological parameters-viscosity loss, viscoelasticity and pressure drop. Therefore, a linear relationship between viscosity loss and shearing ratewas established so as to obtain the targeted viscosity easily. Field tests in the Daqing Oil Field showed that the polymer molecular weight could drop 20% to 50%. In a word, the results could guide the industrial application of the novel device and the further study of polymer degradation flowing through the porous medium.

Key words: Molecular weight adjusting device, Polymer solution, Rheological behavior, Mechanical degradation, Porous medium

Lühong Zhang, Jiangtao Wang, Yuqi Zhang, Bin Jiang, Xiaoming Xiao, Li Hao. Rheological behavior of hydrolyzed polyacrylamide solution flowing through a molecular weight adjusting device with porous medium[J]. Chinese Journal of Chemical Engineering, 2016, 24(5): 581-587.

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Rheological behavior of hydrolyzed polyacrylamide solution flowing through a molecular weight adjusting device with porous medium

Rheological behavior of hydrolyzed polyacrylamide solution flowing through a molecular weight adjusting device with porous medium

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