吉木萨尔页岩油水平井大段多簇压裂技术

Large-Section and Multi-Cluster Fracturing Technology for Horizontal Wells in the Jimsar Shale Oil Reservoir

吉木萨尔凹陷芦草沟组页岩油储层物性差,非均质性强、原油流动性差,水平井精准改造优势储层的难度大,分段压裂方式增产效果有限,压裂投入高、产出低的矛盾突出。针对这些问题,采用非均匀极限限流布孔技术改善段内各簇的压裂液进液分布,通过缝口暂堵和缝内暂堵提高净压力以形成复杂缝网,优化压裂施工参数促进段内多簇裂缝均衡起裂,最终形成了适用于吉木萨尔页岩油藏的水平井大段多簇压裂技术。现场应用效果表明,该技术可有效提高页岩油储层的改造程度和生产效果,为吉木萨尔页岩油经济有效开发提供有力支撑。

Reservoirs in the Lucaogou Formation of the Jimsar Sag have poor physical properties,strong heterogeneity,and poor crude oil fluidity.Accordingly,it is difficult to accurately stimulate favorable reservoirs with horizontal wells,and staged fracturing has only a limited positive effect on production.Contradiction is highlighted by the fact that a high investment yields only a low level of output.In order to solve these problems,non-uniform limitedentry perforation was conducted to improve the distribution of fracturing fluid in the fracture clusters in the sections.Temporary plugging at the fracture entrance and in the fracture were adopted to increase the net pressure,so as to generate complex fracture networks.In addition,fracturing parameters were optimized to facilitate the balanced initiation of multiple clusters of fractures in the sections.Finally,the large-section and multi-cluster fracturing technology suitable for the horizontal wells in the Jimsar shale oil reservoir was developed.Field applications showed that the technology can enhance the stimulation and production of shale oil reservoirs,and provide strong support for the economic and effective development of the shale oil reservoir in the Jimsar Sag.