岩心表面润湿性与化学选堵剂对油水的封堵能力

选择阳离子聚丙烯酰胺类选堵剂,进行岩心模拟实验,研究不同岩心表面润湿性与化学选堵剂封堵能力之间的关系.表面润湿性强烈影响对水的堵塞率,水润湿性越强,对水的堵塞率越高,典型的亲水表面和亲油表面对水的堵塞率相差20%左右;使用水基凝胶,水驱后的残余阻力系数(RRF)大于油驱后的RRF,水基凝胶使水相渗透率的降低比油相渗透率的降低多.对于润湿性相同,渗透率不同的天然岩心,选堵剂的堵水率大于85%,堵油率在20%左右,表现出良好的选择性.

Surface wetting property of corn and its influence on different plugging abilities to oil and water using selective plugging agent

With the chemical selective water-plugging agent of cation polyacrylamide type, the corn simulation experiments were carried out. The relationship between the surface wetting ability of corns and the plugging abilities of the selective plugging agent was investigated. It follows that the surface wetting ability has obvious effects on the water-plugging rate. The stronger water wetting is, the higher is the water-plugging rate. The plugging rate difference between the typical hydrophilic surface and lipophilic surface is about 20%. Using the water gel, the residual resistance factor %(RRF)% after water drive is higher than that after oil drive. The decrease of water permeability is larger than that of oil permeability when water gel is used. For the corns with same wetting abieity but different permeability, the water-plugging rate of plugging agent is greater than 85% and the oil-plugging rate is about 20%. The plugging agent has good selectivity.