低油水比乳状液稳定性影响因素分析
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国家自然科学基金“基于数据驱动的深水钻井溢流智能识别与反演解释研究”(项目编号51904034)


Analysis of Factors Affecting Stability of Low Oil-water Ratio Emulsion
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    摘要:

    为获得低油水比下性能稳定的油基钻井液,油包水乳状液的稳定性是关键。通过电稳定性测试法、静态稳 定性测试法、微观形态测试法分析了乳化剂加量、有机土加量和温度对油水比为60∶40的油包水乳状液稳定性的 影响。研究结果表明:4%乳化剂加量下乳液滴细小且分散均匀,破乳电压最高,乳状液稳定性最佳。环境温度 100 ℃和120 ℃下,乳状液液滴大小变化不大,破乳电压接近,稳定性差别不大,继续提高温度至150 ℃,乳状液 液滴显著增大,破乳电压陡降,稳定性明显变差。有机土加量为2%时,显微镜放大400倍下乳状液液滴肉眼不可 见,破乳电压超过400 V,且静置25 h后析油率仅0.1%,稳定性显著提高。通过关键处理剂材料作用机理分析并 优选合适处理剂加量,是保证低油水比乳状液稳定的一大关键,对现场油基钻井液性能维护有实际指导意义。

    Abstract:

    In order to obtain oil-based drilling fluids with stable performance at low oil to water ratios,the stability of water-in-oil emulsions is critical. The effects of emulsifier addition,organic soil addition and temperature on the stability of water- in- oil emulsion with oil-water ratio of 60/40 were analyzed by electrical stability test,static stability test and micro-morphometry. The results showed that when the addition of the emulsifier was 4% ,the emulsion droplets were fine and dispersed evenly,the demulsification voltage was the highest and the emulsion stability was the best. At the temperature of 100 ℃ and 120 ℃,the emulsion droplet size changed little,and the demulsification voltage was close,indicating that there was little difference on stability. However,when the temperature increased up to 150 ℃,the emulsion droplets augmented significantly,the demulsification voltage droped sharply,stability significantly deteriorated. When adding 2% organic soil,the emulsion droplets under 400 times objective lens were invisible to the naked eye,the demulsification voltage exceeded 400 V,and the oil separation rate was only 0.1% after standing for 25 hours,as a result,the stability was remarkably improved. Analyzing the mechanism of key materials and optimizing the amount of appropriate treatment agent were important to ensuring the stability of emulsions with low oil-to-water ratio,which had practical guiding significance for on-site oil-based drilling fluid performance maintenance.

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  • 在线发布日期: 2021-07-06
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