纳米聚合物微球调驱封堵机理及现场试验

Profile Control Mechanism and Field Test of Nano Polymer Microspheres

为了明确WQ纳米聚合物微球微观结构、粒径随时间的变化规律、调驱封堵机理以及现场应用效果,应用光学显微镜、扫描电镜、激光粒度仪、调驱封堵物理模拟实验等测试方法及手段并结合现场试验对WQ聚合物微球进行了系统研究。结果表明:随着水化时间延长,WQ纳米聚合物微球粒径逐渐增大,长链分子相互缠绕发生团聚作用,微球粒径出现分级;在不同的储层物性条件下,不同粒径微球调驱封堵效果差异很大,小粒径微球进入高渗层深部滞留、膨胀,增大了高渗层比表面积,降低了高渗层渗透率,其调驱适应性明显优于大粒径微球的调驱适应性。现场应用情况结果表明,姬塬油田B102区块5个井组单日总产油量增加5.2 t,综合含水率下降5%,调驱增产效果明显。

In order to understand the nficrostructure, particle size variation, profile control plugging mechanism of WQ nano polymer microspheres and its fieldapplication effect, the WQ polymer microspheres were studied by means of optical microscope, scanning electron microscope （SEM） ,laser particle size analyzer, and profile control plugging simulation experiments and field tests. The results show that with the extension of hydration time, the size of WQ nano polymer microspheres gradually increases, the long chain molecules intertwine and agglomerate, and the microspheres with different particle sizes are formed. Under the conditions of different reservoir physical property, the profile control plugging effect of different particle size microspheres is very different. The small size microspheres enter the deep part of high permeability layer and expand ,which increases the specific surface area of the high permeability layer and reduces its permeahility, and the adaptability- of the small size microspheres to profile control flooding is better than that of the large size microspheres. The field application results show that the total daily oil production of 5 well groups in B102 block of Jiyuan oilfield increased by 5.2 t, and the comprehensive water cut decreased by 5%. The profile control flooding of WQ nano polymer microspheres achieved a good pro- duction increasing effect.