摘要
为了更好地推广和应用新型聚合物微球逐级深部调剖技术,对该技术的主体聚合物微球的粒径影响因素及封堵特性进行了研究。结果表明,适量的NaCl有助于微球的溶胀,Ca2+和Mg2+的存在会抑制聚合物微球的溶胀;总矿化度越高,微球膨胀速度越慢;温度越高,微球体系的膨胀速度越快;膨胀15d、粒径为4μm的微球对渗透度为400×10-3μm2的岩心的封堵效果最好。用膨胀15d的微球对不同渗透率填砂岩心进行封堵实验,结果表明封堵效率与渗透率成反比;对高渗透岩心,提高聚合物微球浓度对封堵效率影响甚微。微球膨胀粒径的大小决定着封堵机理,也是决定封堵效果的重要因素。
In order to bring the novel technique of in - depth profile control step by step by polymer microspheres into wider use,the size influence factors and the plugging properties of polymer micro-spheres are studied. The results show that the appropriate amount of NaCl conduces to the swelling of the polymer microspheres; on the contrary, the existence of Ca2+ and Mg2+ could inhibit the swelling of the polymer microspheres. Dilatation rate decreased with the increase of the salinity, and increased with the increase of the temperature. The polymer microspheres with 4μm of size for 15d swelling have the best plugging efficiency than that of other sizes in 0.4μm2 sand pack cores. The experiments are done by using the polymer microspheres with 15d swelling to plug sand pack cores with different permeability, and it was found that the plugging efficiency is in inverse proportion to the permeability. Increasing the concentration of polymer microspheres has little effect on the plugging efficiency in high - permeability cores. The size of polymer microspheres determines the plugging mechanism and the efficiency.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2006年第4期80-82,共3页
Petroleum Geology and Recovery Efficiency
关键词
聚合物微球
深部调剖
粒径
膨胀
封堵效率
polymer microspheres, in-depth profile control, size, dilatation, plugging efficiency
