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体积压裂用疏水缔合聚合物PAAD-18的合成及性能研究

Synthesis and performance study of a hydrophobic association polymer PAAD-18 for volume fracturing

    摘要
  • 摘要:
    目的 单一功能的压裂液难以满足页岩油气的开采需求，为实现一剂多用，研制了兼顾减阻和增稠性能的一体化聚合物。
    方法 以丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)和十八烷基烯丙基二甲基氯化铵(DMAAC-18)为原料，采用水溶液聚合法，通过单因素实验确定最佳反应条件，合成了三元疏水缔合聚合物PAAD-18，进行了结构表征及性能测试。
    结果 聚合物质量分数为0.1%时，减阻率为71%，在10 m/s的流速下持续剪切10 min，减阻率保持在70%以上；质量分数为0.5%时，表观黏度为106.5 mPa·s，90 ℃下黏度保留率为74.6%，盐水中黏度保留率大于52.1%。
    结论 该聚合物具有良好的耐温、耐盐及耐剪切性能，低含量下可做减阻剂，高含量下可做增稠剂，为体积压裂用多功能聚合物。

     

    Abstract:
    Objective Aiming at the situation that single-function fracturing fluid is difficult to meet the demand of shale oil and gas exploitation, a multifunctional polymer features drag reduction and thickening properties were compounded to realize one agent for multiple purposes.
    Methods A ternary hydrophobic association polymer PAAD-18 was synthesized by acrylamide (AM), 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and octadecyl dimethyl allyl ammonium chloride (DMAAC-18) via free radical aqueous solution polymerization. The optimal reaction conditions were determined by single factor experiment. Then the structure characterization and performance testing were carried out.
    Results When the concentration of PAAD-18 is 0.1 wt%, the drag reduction rate is 71%, and the drag reduction rate remains above 70% at 10 m/s flow rate shearing for 10 min. When the concentration is 0.5 wt%, the apparent viscosity is 106.5 mPa · s, the viscosity retention reaches 74.6% at 90 ℃, over 52.1% in salt water.
    Conclusions Attributing to the significant temperature resistance, salt resistance and shear resistance, PAAD-18 is a multifunctional polymer for volume fracturing, which can be used as drag reducer at low concentration and thickener at high concentration.

     

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