安83区页岩油水平井大规模蓄能体积压裂技术

Large-Scale Energy Storage Volumetric Fracturing Technology for Horizontal Wells in the An 83 Shale Oil Reservoir

安83区页岩油储层致密,能量补充效果差,早期提高单井产量措施未能获得预期的开发效果。根据前期注水补能探索及重复压裂试验认识,在注水补充地层能量和升级压裂工具的基础上,研究了极限分簇射孔、储层差异化改造和多级动态暂堵等工艺,不仅提高了裂缝复杂程度,同时优化闷井时间,形成了水平井大规模蓄能体积压裂技术。现场试验结果表明,应用该技术后,水平井产量大幅提高,最高单井日产油量为邻井的7倍,措施后生产10个月,单井累计增油量达到2 010.0 t,效果和效益显著提高。该技术可实现同时补充地层能量及有效改造储层,对同类油藏的开发具有一定的技术参考价值。

Early single-well stimulation attempts in the An83 shale oil reservoir failed to achieve the desired results due to its tight formation and poor energy replenishing effect.According to the previous attempts at energy storage by water injection and refracturing experiments,formation energy was replenished through water injection and the fracturing tools were upgraded.On this basis,extreme clustered perforation,differential reservoir stimulation and multistage dynamic temporary plugging were studied to improve the complexity of fractures,and the well shut-in time was optimized.Finally,the large-scale energy storage volumetric fracturing technology was formed.Field testing results showed that the production of horizontal wells was significantly increased by using the new technology,and the daily oil production of a single test well achieved up to 7 times that of adjacent wells.After 10 months of production,the cumulative oil increment of a single well reached 2010 tons,with good economic benefits.The technology can replenish the energy of reservoir and effectively stimulate the reservoir,providing a reference for the development of other similar reservoirs.