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首页> 外文期刊>RSC Advances >Effect of molecular flexibility on the rheological and filtration properties of synthetic polymers used as fluid loss additives in water-based drilling fluid
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Effect of molecular flexibility on the rheological and filtration properties of synthetic polymers used as fluid loss additives in water-based drilling fluid

机译：分子柔性对水性钻井液中流体损失添加剂的流变滤波性能的影响

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摘要

The effect of molecular flexibility on the rheological and filtration properties of synthetic polymers used as fluid loss additives in water-based drilling fluid was investigated. A new synthetic polymer (PAANS) comprising acrylamide (AM), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), N-vinyl-2pyrrolidone (NVP) and potassium 2,5-dihydroxybenzenesulfonate (DHBS) was synthesized, in which phenyl groups were introduced in the backbone. Two other comparative polymers, PAAN and PAANS, were also prepared following the same synthesis procedure. PAAN comprises AM, AMPS and NVP, while PAANS consists of AM, AMPS, NVP and sodium 4-styrenesulfonate (SSS). PAAN, PAAND and PAANS were characterized by H-1 NMR and elemental analysis, and the molecular weight was determined by static light scattering (SLS). The rheological properties, filtration properties and performance sustainability were investigated. Using a rheological properties measurement test, the apparent viscosity (AV), plastic viscosity (PV) and yield point (YP) of the Na-MMT/PAAND system at a concentration of 2.0% were 18.0 mP s, 12.0 mP s and 6.0 Pa, respectively, after a thermal aging test at 240 degrees C for 16 h. These values are much higher than those of the corresponding Na-MMT/PAAN and Na-MMT/PAANS systems. The API filtration loss volume (FLAPI) and high-temperature/high-pressure filtrate volume (FLHTHP) of the NaMMT/ PAAND system at a concentration of 2.0% were 12.0 mL and 30.0 mL, respectively, after a thermal aging test at 240 degrees C for 16 h. These values are much lower than those of the Na-MMT/PAAN and NaMMT/ PAANS systems. Compared with PAAN and PAANS, PAAND presents the best performance sustainability after multiple shearing and thermal aging tests. At the same temperature, the order of maintaining rheological performance and controlling the FLAPI and FLHTHP was PAAND > PAANS > PAAN in Na-MMT/PAANS-based drilling fluid at high temperature. Increasing the percentage of rigid monomers in the backbone was found to be conducive to maintaining the rheological stability and improving the filtration properties at high temperature. The control mechanism of fluid loss was investigated through adsorption tests using the method of thermal filtration, assessing particle size distribution on a laser diffraction particle size analyzer (LPSA) and examining filter cake morphologies using an environmental scanning electron microscope (ESEM). The results reveal that the introduction of rigid monomers into the synthetic polymer backbone can effectively improve the adsorption capacity of the polymer on the clay surface, obstruct the aggregation of clay particles, filter cakes at high temperatures.
机译：对水基钻井液用作降滤失添加剂的合成聚合物的流变学和过滤特性分子柔性的影响进行了研究。一种新的合成聚合物（PAANS），其包括丙烯酰胺（AM），2-丙烯酰氨基-2-甲基-1-丙烷磺酸（AMPS），N-乙烯基-2-吡咯烷酮（NVP）和钾2,5-二羟基苯磺（地区保健委员会）合成，其中苯基基团在主链中进行了介绍。也按照相同的合成方法的其他两个比较聚合物，磐安和PAANS。磐安包括AM，AMPS和NVP，而PAANS由AM，AMPS，NVP和4-苯乙烯磺酸钠（SSS）的。通过H-1 NMR和元素分析磐安，PA和和PAANS进行表征，且分子量通过静态光散射（SLS）测定。流变性能，过滤性能和使用性能的可持续性进行了调查。使用的Na-MMT / PA和系统的流变学特性测定试验中，表观粘度（AV），塑性粘度（PV）和屈服点（YP）以2.0％的浓度分别为18.0的mP S，12.0的mP秒和6.0帕分别在240℃的热老化试验16小时后。这些值比相应的Na-MMT /磐安和Na-MMT的高得多的/ PAANS系统。以2.0％的浓度的NaMMT / PA和系统的API滤失体积（FLAPI）和高温/高压的滤液体积（FLHTHP）分别为12.0 mL和30.0毫升，分别在240度的热老化试验后下16小时。这些值比那些NaMMT /磐安和NaMMT的低得多/ PAANS系统。与磐安和PAANS，PA和礼物相比，多个剪切和热老化试验后的最佳性能可持续性。在相同温度下，保持流变性能和控制FLAPI和FLHTHP的顺序为PA和> PAANS>磐安的Na-MMT / PAANS基于钻在高温下的流体。增加在主链的刚性单体的百分比被认为是有利于保持流变稳定性和在高温下改进过滤性能。流体损失的控制机构，用热过滤的方法通过吸附试验，研究，评估上的激光衍射粒度分析仪（LPSA）颗粒尺寸分布和检查使用环境扫描电子显微镜（ESEM）滤饼形态。结果表明，引入刚性单体到合成聚合物主链可有效地提高聚合物的吸附容量粘土表面上，阻碍粘土颗粒，滤饼的聚合在高温下。

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  • 来源
    《RSC Advances》 |2019年第15期|共12页
  • 作者

    Chu Qi; Lin Ling;

  • 作者单位

    State Key Lab Shale Oil &

    Gas Enrichment Mech &

    E Beijing 100101 Peoples R China;

    Southwest Petr Univ Sch Chem &

    Chem Engn Chengdu 610500 Sichuan Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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