无规微支化微交联缔合聚合物的合成及性能评价
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国家科技重大专项“水平井整体注水稳油控水及综合挖潜技术”(项目编号2017ZX05030-001)


Synthesis and Properties of Random Microbranched/Microcrosslinked Associative Polymers
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    摘要:

    为了提高聚丙烯酰胺驱油剂的耐温抗盐性能,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,以AM、AMPS为主要单体,引入自 制的疏水单体和枝化单体合成了一种无规微支化微交联缔合聚合物,采用正交试验方法研究了AM与AMPS物 质的量比、支化单体加量、疏水单体加量、pH值和引发温度对聚合物黏度的影响,并研究了该聚合物的耐温抗盐 性能。研究结果表明,各因素对聚合物黏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。当AM、AMPS物质的量比为5∶1,支化单体加量为0.5‰,疏水单体加量为1‰,体系 pH值为7,引发温度为2 ℃时合成聚合物溶液具有最高的黏度。合成的无规微支化微交联缔合聚合物具有较高 的特性黏数(2868 mL/g)、更低的不溶物含量(0.12%)、更高的聚合物黏度、更优异的热稳定性能,在矿化度40 000 mg/L、95 ℃高温老化180 d 后,质量浓度为1500 mg/L 的聚合物溶液黏度为12.8 mPa·s,黏度保留率可达到 85%以上。老化后无规微支化微交联缔合聚合物溶液仍可满足驱油剂对驱油黏度要求,聚合物溶液在地层具有 较优异的长期稳定性。

    Abstract:

    In order to improve the temperature resistance and salt resistance of polyacrylamide oil displacement agent,the molecular structure design idea was adopted to design the polymer structure from the primary and secondary structures of the polymer,and the advanced structure and molecular chain aggregation state of the polymer were analyzed and integrated. Taking AM and AMPS as the main monomers,a random micro-branched/micro-crosslinking associating polymer was synthesized by introducing self-made hydrophobic monomer and branched monomer. The effects of AM/AMPS ratio,branched monomer dosage, hydrophobic monomer dosage,pH value and initiation temperature on the viscosity of the polymer were studied by orthogonal test, and the temperature resistance and salt resistance of the polymer were studied. The results showed that the order of the influence of various factors on polymer viscosity was as follows:branched monomer dosage > hydrophobic monomer dosage > AM/AMPS molar ratio > pH value > initiation temperature. When the molar ratio of AM to AMPS was 5∶1,the amount of branched monomer was 0.5‰,the amount of hydrophobic monomer was 1‰,pH value of the system was 7,and the initiation temperature was 2 ℃,the obtained polymer had the highest viscosity. The synthesized random micro-branched/micro-crosslinking associative polymer had high intrinsic viscosity of 2 868 mL/g,lower insoluble content of 0.12%,higher polymer viscosity and better thermal stability. The viscosity of the polymer solution with the concentration of 1 500 mg/L was 12.8 mPa·s after aging for 180 d at high temperature of 95 ℃ and at salinity of 40 000 mg/L,and the viscosity retention rate could reach more than 85%. After aging,the random micro-branched/micro-crosslinked association polymer solution could still meet the viscosity requirements of oil displacement agents,and the polymer solution had excellent long-term stability in the formation.

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张峰,王琪譞,王浩帆,王裕馨,刘博峰,吕龙.无规微支化微交联缔合聚合物的合成及性能评价[J].油田化学,2022,39(3):480-485.
ZHANG Feng, WANG Qixuan, WANG Haofan, WANG Yuxin, LIU Bofeng, LYU Long. Synthesis and Properties of Random Microbranched/Microcrosslinked Associative Polymers[J]. OILFIELD CHEMISTRY,2022,39(3):480-485.

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  • 在线发布日期: 2022-10-20
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