聚合物微球降滤失剂制备及其性能评价
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] 国家科技重大专项《延安地区陆相页岩气勘探开发关键技术》(编号:2017ZX05039-003)与公司级项目《延长西部油田钻井防漏堵漏技术研究与应用》(编号:ycsy2017ky-B-08)共同资助。


Preparation and performance evaluation of polymer microsphere as drilling fluid filtrate additive
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    摘要:

    针对现有降滤失剂在高温高矿化度环境下常常发生失效等问题,本文选择具有苯环结构和磺酸基团(对苯乙烯磺酸钠、2-丙烯酰胺-2-甲基丙磺酸)和丙烯酰胺水溶性单体,以失水山梨糖醇脂肪酸酯、聚氧乙烯山梨醇酐单硬脂酸酯和液体石蜡为油相,采用反相乳液法合成聚合物微球。使用红外光谱、热重分析、扫描电子显微镜、激光粒度仪等多种方式对样品进行表征,并对其进行了溶胀性能、抗盐性能、老化性能、耐温性能和岩心中封堵性能进行了研究。研究表明聚合物微球具有光滑的球型外貌,粒径在2.82-10.26 μm范围,在270 ℃开始热分解。研究发现微球在达到溶胀平衡后溶胀接近5倍,在高矿化度和高温测试环境中表现出良好的降滤失性能,具有抗老化性能,在驱替实验后的岩心中可以清楚地看到微球在大孔隙聚集从而进行封堵。

    Abstract:

    As the existing filtrate reducers often have an unsatisfied performance in the high temperature and high salinity environment, a polymer microsphere is synthesized by inverse emulsion polymerization of water-soluble monomers (sodium p-styrene sulfonate, 2-acrylamide-2-methylpropanesulfonic acid and acrylamide) using liquid paraffin as the continuous phase, Span 80 and Tween 60 as emulsifier. Infrared spectroscopy, thermogravimetric analysis, scanning electron microscope and laser particle size analyzer are used to characterize the product. Then the swelling performance, salt resistance, aging performance, temperature resistance and plugging experiments also are studied. It is shown that microspheres display a spherical morphology with a particle size of 2.82-10.26 μm, and begin to decompose at 270 ℃. It is found that the final expansion ratio in deionized water approaches to 500%. In addition, microspheres exhibit a good fluid loss reduction performance in high salinity and high temperature conditions, and have anti-aging property. After plugging experiments, the polymer microspheres are observed in macropore of core slice, where plug performance is achieved by polymer microspheres.

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  • 收稿日期:2021-03-03
  • 最后修改日期:2021-07-07
  • 录用日期:2021-07-19
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