无规微支化微交联缔合聚合物合成及性能研究
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中国石油玉门油田公司 工程技术研究院

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国家科技重大专项(2017ZX05030-001)


Synthesis and properties of random microbranched/microcrosslinked associative polymers
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    摘要:

    在聚合物驱油过程中经常遇到高温高矿化度油藏,在此环境下,聚丙烯酰胺会发生热降解、剪切降解及氧化降解,进而使其粘度急剧下降,起不到驱油效果。本文采用分子结构设计思路,从高分子的一级、二级结构入手对聚合物结构进行设计,对高分子的高级结构、分子链聚集状态进行分析整合,使聚合物形成一种无规微支化微交联缔合结构,减少聚合物对温度及二价金属离子的敏感程度,提高产品的耐温抗盐性能。为了提高工作液的粘度,采用正交试验的方法研究了AM/AMPS、支化单体加量、疏水单体加量、pH值和引发温度对聚合物粘度的影响,确定了各因素对聚合物粘度影响的主次关系为:支化单体加量>疏水单体加量>AM/AMPS配比>体系pH值>引发温度。

    Abstract:

    In the process of polymer flooding, high temperature and high salinity reservoirs are often encountered. In this environment, polyacrylamide will undergo thermal degradation, shear degradation and oxidative degradation, which lead to a sharp decline in its viscosity, and fail to achieve oil displacement effect. In this paper, the molecular structure design idea was used to design the polymer structure from the primary and secondary structures of the polymer. The advanced structure and molecular chain aggregation state of the polymer were analyzed and integrated, so that the polymer formed a random micro-branched/micro-crosslinking association structure, which reduced the sensitivity of the polymer to temperature and divalent metal ions, and improved the temperature and salt resistance of the product. In order to improve the viscosity of the working fluid, the effects of AM / AMPS, branched monomer dosage, hydrophobic monomer dosage, pH value and initiator temperature on the viscosity of the polymer were studied by orthogonal test. The primary and secondary relationships of various factors on the viscosity of the polymer were determined as follows : branched monomer dosage > hydrophobic monomer dosage > AM / AMPS ratio > pH value of the system > initiator temperature.

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  • 收稿日期:2021-02-20
  • 最后修改日期:2021-04-27
  • 录用日期:2021-06-25
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