聚合物微球降滤失剂的制备及性能评价
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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”(项目编号2017ZX05039-003),延长石油集团项目“延长西部油 田钻井防漏堵漏技术研究与应用”(项目编号ycsy2017ky-B-08)


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失效等问题,选择具有苯环结构和磺酸基团的对苯乙烯磺酸钠、 2-丙烯酰胺-2-甲基丙磺酸及丙烯酰胺等水溶性单体,以失水山梨糖醇脂肪酸酯(Span 80)、聚氧乙烯山梨醇酐单 硬脂酸酯(Tween 60)和液体石蜡为油相,采用反相乳液法制备聚合物微球。通过红外光谱仪、热重分析仪、激光 粒度仪和扫描电子显微镜等对产物进行表征,研究了微球的溶胀性能、抗盐性能、老化性能、耐温性能和在岩心 中的封堵性能。结果表明,聚合物微球具有光滑的球型外貌,粒径为2.82~10.26 μm,在270 ℃开始热分解。微 球在达到溶胀平衡后溶胀接近5倍,在高矿化度和高温环境中表现出良好的降滤失性能,抗老化性能良好。在岩 心中的封堵降滤失效果较好,微球在大孔隙聚集并有效封堵。

    Abstract:

    Aiming at the failure of existing fluid loss agent in the environment of high temperature and high salinity,a polymer microsphere was synthesized through inverse emulsion polymerization by water-soluble monomers,such as sodium p-styrene sulfonate with benzene ring structure and sulfonic acid group,2-acrylamide-2-methylpropanesulfonic acid and acrylamide,and oil phases,such as sorbitan fatty acid ester(Span 80),polyoxyethylene sorbitan monostearate(Tween 60)and liquid paraffin. Infrared spectroscopy,thermogravimetric analysis,scanning electron microscope and laser particle size analyzer were used to characterize the product. Then the swelling performance,salt resistance,aging performance,temperature resistance and plugging performance in the core were studied. The results showed that the microspheres displayed a spherical morphology with a particle size of 2.82—10.26 μm,and began to decompose at 270 ℃. It was found that the final expansion ratio of microspheres in deionized water was nearly 5 times the size of the previous one after reaching the swelling equilibrium. Microspheres exhibited a good fluid loss reduction performance in high salinity and high temperature conditions,and had good anti-aging property. A good plugging performance was observed in core plugging experiments. The polymer microspheres aggregated in macropores,where effective plugging was achieved.

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  • 在线发布日期: 2022-04-25
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