油基超细水泥浆选择性堵剂研究

OIL- BASED FINELY PARTICULATED CEMENT AS WATER PLUGGING AGENT: PREPARATION AND PERFORMANCE PROPERTIES

油基超细水泥浆可用作油藏的选择性堵水剂。本文工作考察了添加剂用量、油灰比、油基携带液和配制温度对其密度和流动性的影响 ,研究了油基水泥浆的水化性能 。

The titled agent is prepared from a commercial fine oilwell cement of grade G, a mixture of oil and water soluble surfactants, and diesel oil for water plugging in oil reservoirs selectively. The influences of the amount of surfactants added, the oil to cement ratio, the grade of base diesel oil used, the ambient temperature, and the water amount admixtured are investigated and the hydrability and setting of the oil based fine cement at varying water to cement ratio are studied. In core plugging experiments with a formulated oil based cement slurry on three core samples, high water plugging rates (90.4—94.3%) and relatively low oil plugging rates (24.2—26.4%) are observed.