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针对华北岔河集油田岔15断块高温(74℃)、高盐(地层水矿化度为15200mg/L),平面和纵向上非均质性强,一般三采方法提高采收率不理想的现状,开展了岔15断块微球调驱适应性分析。研究结果表明,3μm微球和3μm+500nm混合微球(质量比为1∶1)具有理想封堵岩心孔隙喉道的作用和能力。其中,3μm+500nm混合微球(质量比为1∶1)的封堵能力大于单一的3μm微球的封堵能力;大粒径(3μm)微球的有效作用时间(200d)大于3μm+500nm混合微球(质量比为1∶1)的有效作用时间(100d)。实验结果表明,选用柔性微球驱替原油,在一定程度上提高了原油的采出程度,效果较为理想。影响微球颗粒是否成功最为关键的因素,是颗粒大小与孔隙喉道直径的匹配。根据搭桥堵塞原理,颗粒直径为孔道直径的1/8～1/3,才能产生有效搭桥作用。
In view of the high temperature (74 ℃) and high salt (formation water salinity 15200mg / L) in the fork section 15 of Chaheji oil field in North China, the horizontal and vertical inhomogeneities are strong. The status quo, carry out Chak 15 fault block microsphere adaptability analysis. The results show that 3μm microspheres and 3μm + 500nm hybrid microspheres (mass ratio of 1: 1) have the ideal plugging core pore throat function and ability. The plugging capacity of 3μm + 500nm hybrid microspheres (mass ratio of 1: 1) was larger than that of single 3μm microspheres. The effective time (200d) of large diameter (3μm) microspheres was more than 3μm + 500nm The mixed microspheres (mass ratio of 1: 1) effective duration of action (100d). Experimental results show that the use of flexible microspheres instead of crude oil, to a certain extent, increased the degree of recovery of crude oil, the effect is more satisfactory. The most crucial factor that influences the success of microsphere particles is the match between particle size and pore throat diameter. According to the principle of bypass blockage, the diameter of the particles is 1/8 ~ 1/3 of the diameter of the channel, in order to produce an effective bypass effect.