固体微粒对油水体系的乳化稳定作用

THE EMULSIVE STABILITY OF FINE SOLID PARTICES IN OIL-WATER SYSTEMS

采用静置（或离心）沉降法和乳滴稳定性测试法，研究了与钻井液、完井液有关的若干种固体微粒对油、水体系乳化稳定性的影响。研究结果表明，在一定条件下，钻井液中的某些固体微粒能完全或部分替代表面活性剂，对油、水体系起乳化稳定作用。一般情况下，亲油的固体微粒（如有机土）倾向于稳定Ｗ／Ｏ乳状液；亲水的固体微粒倾向于稳定Ｏ／Ｗ乳状液；接近中性润湿的固体微粒（如ＳＮ－１）对两类乳状液均具有一定的稳定作用。固体微粒的种类、加量、粒径和形状也是决定其乳化稳定作用的重要因素。

The effects of a lot of finely particulated solids existed in drilling and completion fliuds upon the emulsive stability of oil-water systems are studied on the basis of static or centrifugal settlement tests and coalescence stability measurements for oil and water droplets in emulsions.It is shown that the emulsive stability of some particulated solids in the experimental conditions is high enough to substitute partially or completely for the surfactant/emulsificator in preparing emulsified(O/W or W/O) drilling fluids. In general,the oil-wet particles such as organic clay tend to stabilize W/O emulsions. the water-wet particles such as CaCO3-O/W emulsions,the nearly neutral particles such as solid emulsificator SN-1 -both of these emulsions.The species. concentrations. particle sizes and shapes of the particulated solids are found to be also important factors for emulsive stability of oil-water systems.