Abstract Nonionic nano-micro latex was prepared via emulsion polymerization with styrene (St), butyl acrylate (BA) and polyethylene methyl ether methacrylate (MAPEME). The structure of latex was characterized by Fourier transform infrared spectroscopy (FTIR). Particle size tester was employed to detect the size distribution and 20% volume of latex was attributed to nano-scale. Gel permeation chromatography (GPC) testing result showed that the average molecular weight of latex was 403,493 with polymerization dispersion degree (Mw/Mn) was 2.30. The influence of latex on filtration performance in water-based drilling fluids was estimated, and swelling tests were carried on both under room temperature and normal pressure (RTNP) and high temperature and high pressure (HTHP) to evaluate the interaction between the bentonite clay and latex. Experimental data showed that the latex controlled the HTHP filtration of polysulfide drilling fluid and KCl/polymer drilling fluid to 10–15 mL at 120 °C by improving the quality of filter cake. The latex could relieve the hydration expansion of the bentonite clay balls and keep ball integrity for 7 days under RTNP or 16 h at 90 °C under HTHP. In addition, the presence of NaCl was helpful to maintain the stability of the bentonite clay balls till 120 °C.

中文翻译：

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非离子纳米微胶乳对水基钻井液过滤及膨润土溶胀的影响

摘要 以苯乙烯（St）、丙烯酸丁酯（BA）和聚乙烯甲基醚甲基丙烯酸酯（MAPEME）为原料，通过乳液聚合制备了非离子纳米微胶乳。乳胶的结构通过傅里叶变换红外光谱（FTIR）表征。使用粒度测试仪检测粒度分布，20%体积的乳胶属于纳米级。凝胶渗透色谱(GPC)测试结果表明，胶乳的平均分子量为403,493，聚合分散度(Mw/Mn)为2.30。评估了乳胶对水基钻井液过滤性能的影响，并在常温常压（RTNP）和高温高压（HTHP）下进行了溶胀试验，以评估膨润土与乳胶。实验数据表明，胶乳通过提高滤饼的质量，将多硫化物钻井液和 KCl/聚合物钻井液的 HTHP 过滤控制在 10-15 mL 在 120 °C。乳胶可以减轻膨润土粘土球的水化膨胀，并在 RTNP 下保持球体完整性 7 天或在 HTHP 下 90°C 下保持球体完整性 16 小时。此外，NaCl 的存在有助于将膨润土粘土球的稳定性维持到 120 °C。