Quantifying the Matching Relationship of Sizes Between Partially Hydrolyzed Polyacrylamides and Regular Nuclepores

IF 2.7 3区化学 Q2 POLYMER SCIENCE

Journal of Applied Polymer Science Pub Date : 2025-03-04 DOI:10.1002/app.56943

Xinyi Fan, Hao Zhang, Yan Zhang, Zhengdong Lei, Yujun Feng

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Abstract

Water-soluble polymers have been extensively utilized for enhanced oil recovery (EOR) due to their strong thickening power to aqueous displacement fluids. However, the typical EOR polymer, high-molecular-weight (MW) partially hydrolyzed polyacrylamide (HPAM), often encounters injectivity challenges, particularly in low permeability reservoirs, which is attributed to the lack of a quantitative matching relationship of sizes between polymer and porous media. In this study, the radius of gyration (R _g) and the hydrodynamic radius (R _h) of five HPAMs with various MW ranging from 4.8 × 10⁶ to 15.4 × 10⁶ g·mol⁻¹ were determined via light scattering. Subsequently, by employing polycarbonate nuclepore membranes to mimic regular micro- and nano-pore throats, the flow and matching relationship of these HPAM solutions in porous media were investigated. It was found that the R _g of HPAM gradually magnifies from 89 to 161 nm with an increase in polymer MW, while R _h ranges from 53 to 92 nm. The matching relationship between R _g/R _h and nuclepore size (R _p) can be described as follows: when R _p/R _g < 2.01 or R _p/R _h < 3.7, injection difficulties emerge for HPAM solution; conversely, when R _p/R _g > 2.48 or R _p/R _h > 4.77, there is no blockage caused by the HPAM solution.

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部分水解聚丙烯酰胺与规则核孔尺寸匹配关系的定量研究

由于水溶性聚合物对水驱替流体具有很强的增稠能力，因此被广泛用于提高采收率（EOR）。然而，典型的EOR聚合物，高分子量（MW）部分水解聚丙烯酰胺（HPAM），经常遇到注入能力的挑战，特别是在低渗透油藏中，这是由于聚合物和多孔介质之间缺乏尺寸的定量匹配关系。本文通过光散射法测定了5种分子量为4.8 × 106 ~ 15.4 × 106 g·mol−1的hpam的旋转半径（R g）和流体动力半径（R h）。随后，利用聚碳酸酯核孔膜模拟规则的微孔喉和纳米孔喉，研究了这些HPAM溶液在多孔介质中的流动和匹配关系。随着聚合物分子量的增加，HPAM的rg从89 nm逐渐增大到161 nm， rh从53 nm增大到92 nm。R g/R h与核孔大小（R p）的匹配关系为：R p/R g <； 2.01或R p/R h <； 3.7时，HPAM溶液出现注射困难；相反，当R p/R g >； 2.48或R p/R h >； 4.77时，HPAM溶液不会造成堵塞。

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来源期刊

Journal of Applied Polymer Science 化学-高分子科学

CiteScore

5.70

自引率

10.00%

发文量

1280

审稿时长

2.7 months

期刊介绍： The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.