聚合物微球调驱工艺优化设计

Research on the Optimization of the Polymeric Microsphereprofile Control Technology

聚合物微球具有进行深部调驱的性能,选用纳米聚合物微球与核壳自胶结微球进行室内实验,对注入段塞工艺、不同类型微球组合注入次序与比例以及注入方式进行了系统的优化。结果表明,相比高质量浓度短段塞及低质量浓度长段塞,中等质量浓度中等段塞注入聚合物纳米球工艺综合了以上两种注入工艺的优点,可以在适当的时间内获得相对稳定的采收率;先注入核壳自胶结微球后注入纳米球对于中低渗地层进行深部调驱具有更高的微球利用率及开发效果,实验条件下两者的最佳PV数比为1∶1;间隔注入工艺,使得微球分布于更为广泛的地层中,对于前期形成的新的渗水通道可以进行及时的微球补充,从而使得采收率持续增长。

Since polymeric microspheres have the ability of in-depth profile control,nano-polymeric microspheres and core-shell macadam microspheres were chosen as the materials in the experiments.The slug injection,the order and ratio of the two different polymeric microspheres,and the ways of injection were systematically optimized.The experiment results show that compared with the high-concentration with short-slug and the low-concentration with long-slug,the mid-concentration with mid-slug combined the above advantages,which can obtain a relatively more steady oil recovery ratio during a proper time. Utilization efficiency can be improved by injecting the core-shell macadam microspheres before injecting nano-polymeric microspheres during in-depth profile control,and the best ratio is 1∶1 under the experiment conditions.The microspheres can be distributed more widely in the floor using interval injection,which is favorable for continued growth of oil recovery continually .