聚合物纳米球驱在长庆油田特低渗透油藏中的适应性研究

Research on the adaptability of polymeric nanospheres flooding in extra-low permeability reservoir in Changqing oilfield

蔡永富 黎晓茸 施盟泉 杨立华 刘笑春 吴飞鹏

CAI Yongfu LI Xiaorong SHI Mengquan YANG Lihua LIU Xiaochun WU Feipeng

中国科学院理化技术研究所，北京　100190 中国科学院研究生院，北京　100049 长庆油田油气工艺研究院，陕西西安　710021

Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China Graduate School of the Chinese Academy of Sciences, Beijing 100049, China Research Institute of Oil and Gas Technology, Changqing Oilfield Company, Xi’an 710021, China

针对长庆油田五里湾区特低渗透油藏地层水矿化度高、渗透率低，传统的“三采”增产措施难于开展的问题，开展了聚合物纳米球驱技术研究。利用粒度仪、透射电子显微镜、单管填砂模型以及真实岩心微观模型和双管并联填砂模型从聚合物纳米球的膨胀性、注入性、降低水相渗透率性以及室内模拟驱油几个方面系统研究了其在特低渗透油藏中的适应性。实验结果表明，聚合物纳米球具有良好的注入性，在地层水中可以发生膨胀，并能有选择地降低高渗管的水相渗透率，具有液流改向作用，可有效动用残余油，提高采收率效果显著。聚合物纳米球驱可以作为长庆油田五里湾区特低渗透油藏有效的增产手段，该研究为现场应用提供了实验依据。

Because of aiming at high formation water salinity and extra-low permeability in Block Wuliwan Changqing oilfield, traditional stimulation measures in EOR were difficult to implement. So the polymeric nanospheres flooding technology was discussion in this paper. Using the particle size analyzer and transmission electron microscopy, based on the single sand packs model and the real core visual micro-model and parallel sand packs macro-model, the adaptability of polymeric nanospheres flooding in extra-low permeability reservoir was studied from the aspects of the swelling, injection of polymeric nanospheres, water-permeability reduction as well as laboratory simulated flooding of polymeric nanospheres. The experimental results proved that the polymeric nanospheres had good injection and could swell in formation water. The expanded nanospheres could selectively reduce the water phase permeability of the high-permeability sand packs, and made fluid diverting to effectively displace residual oil and enhance the oil recovery greatly. The polymeric nanospheres flooding could be an effective stimulation measure of production in the extra-low permeability reservoir of Block Wuliwan Changqing oilfield. The research provides experimental basis for further applications of polymeric nanospheres in oil field.