可控自聚集微球/乳化分散体系协同深部调控技术在 渤海某油田的研究与先导性试验

Research and Pilot Test on Synergistic In-depth Conformance Control and Flooding with Controllable Self-aggregation Microspheres/Emulsification Dispersion Agent in Bohai X Oilfield

赵德喜

ZHAO Dexi

针对渤海某油田储层高孔高渗、非均质性强、水油流度比大而导致水驱效率低的问题，提出采用可控自聚 集微球/乳化分散体系协同深部调控技术，以实现该油田控水增油。通过扫描电镜和粒度分析研究了微球的自 聚集性能，采用搅拌乳化法评价了乳化分散体系的乳化性能，并通过填砂管实验，对二者在油藏中适应性进行了 室内评价。结果表明，在油藏条件下，可控自聚集微球可通过其表面的功能化链段实现自聚集，聚集后的粒径是 聚集前的3.1 倍。微球聚集前具有良好的注入性和深部运移能力，注入过程中的压力呈“阶梯状”缓慢增加；聚集 后对渗透率为2000×10-3～2600×10-3 μm2的高渗窜流区域的封堵率可达50%以上。所选乳化分散体系对油田原 油具有良好的乳化性能，当质量浓度≥2000 mg/L时，原油乳化率可达100%，乳化的原油可对地层微观均质性起 到微调作用。可控自聚集微球与乳化分散体系之间具有良好的协同调控性能，在总注入量为1 PV的情况下，质 量浓度为6000 mg/L的可控自聚集微球悬浮液和质量浓度为4000 mg/L的乳化分散体系按段塞比1∶1～3∶1 注入 后，原油采收率可在水驱基础上提高13.1%～18.4%。现场先导性试验结果显示，该技术在试验井组控制区域内 提高采收率效果明显，3 个月净增油量达3260.41 m3。

Aiming at the issue of low water flooding efficiency in Bohai X oilfield due to the properties of high porosity，high permeability，strong heterogeneity，high water-oil mobility ratio in reservoir，an in-depth conformance control and flooding technique of controllable self-aggregation microspheres cooperating with emulsification dispersion agent，was proposed to enhance the oil recovery in the study. The self-aggregation property of the microspheres was studied by scanning electron microscope and particle size analysis，the emulsification property of the emulsion dispersion agent was evaluated by stirring emulsification method， and the performance of the two agents in reservoir was evaluated by sand pack experiment. The results showed that the microspheres could implement self-aggregation through the functionalized chains on the surface under reservoir conditions，and the particle size after aggregation was 3.1 times larger than that before aggregation. The injection pressure of the microspheres in sand packing model increased step by step， revealing the good injectivity and deep migration capability of the microspheres before self-aggregation，and the plugging rate after self-aggregation in the sand packing model with the permeability of 2000×10-3—2600× 10-3 μm2 could be more than 50%. The selected emulsification dispersion agent could emulsify crude oil efficiently. The emulsification rate of crude oil could be 100% as the concentration of the agent was higher than 2000 mg/L，and the micro-homogeneity of the formation could be finely adjusted by emulsified crude oil. There was a good synergistic effect between the microspheres and emulsification dispersion agent. The oil recovery could be increased by 13.1%—18.4% compared with water flooding when the slug ratio of microspheres（6000 mg/L）and emulsification dispersion agent（4000 mg/L）was 1∶1—3∶1 with the total injection volume of 1 PV. The pilot tests showed that the technique proposed could obviously enhance oil recovery，the net oil recovery increased in three months was 3260.41 m3.

10.19346/j.cnki.1000-4092.2023.03.008