页岩压裂用减阻、携砂双功能结构聚合物的动力学分析及其制备
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1.重庆科技学院;2.中国石油集团渤海钻探有限公司第一钻井分公司

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Dynamic analysis and preparation of drag reduction and sand-carrying dual-functional polymer materials for shale fracturing
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    摘要:

    为解决页岩储层缝网体积压裂前端摩阻大、尾端黏度低的问题。本文基于分子动力学研究不同碳链长度孪尾单体的空间位阻,聚合物均方末端距、均方位移(MSD)。利用甲基丙烯酸月桂酯(LMA)、丙烯酰胺(AM)、N,N-二正十二烷基丙烯酰胺(DiC12AM)通过胶束聚合方法合成聚合物LMA-AM-DiC12AM(LAD),对其进行红外、核磁分析;利用流变仪、摩阻仪等研究LAD溶液的流变性、降阻率、携砂性能。结果显示,DiC12AM单体的空间位阻较小、其分子链柔顺性最好、束缚水分子的能力最好,减阻潜力大。LAD具有良好的剪切稳定性(黏度达75 mPa·s)和剪切恢复性能,可耐温60℃,降阻率达67.4%,40/70目陶粒沉降速度为2.05×10-4 mm·s-1;该聚合物同时兼具减阻和携砂两种性能,与模拟结果基本一致。

    Abstract:

    In order to solve the problems of large frictional resistance at the front end and low viscosity at the tail end of volumetric fracturing in shale reservoirs. The steric hindrance of twin tail monomers with different carbon chain lengths, mean square terminal distance and mean square displacement (MSD) of the polymer materials were studied based on molecular dynamics. The drag reducer LMA-AM-DiC12AM (LAD) was synthesized by micellar polymerization with Lauryl methlacrylate (LMA), Acrylamide (AM) and N,N-dodecyl acrylmaide (DiC12AM). The rheological properties, drag reduction and sand carrying properties of LAD solution were studied by rheometer and friction tester. The results show that DiC12AM monomer has small steric hindrance, the best chain flexibility of polymer materials molecules, the best ability to bind water molecules, and the great drag reduction potential. LAD has good shear stability (viscosity is 75mPa·s) and shear recovery performance. It can withstand a temperature of 60℃ at present. Its drag reduction rate reach 67.4%. The average sedimentation rate of 40/70 mesh ceramsite is 2.05×10-4 mm/s. The polymer materials agent has both drag reduction and sand carrying properties, which is basically consistent with the simulation results.

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  • 收稿日期: 2021-09-29
  • 最后修改日期: 2021-12-02
  • 录用日期: 2021-12-09
  • 在线发布日期: 2022-03-17
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