A Dynamic Evolution Model for the Stimulated Reservoir Volume of the Staged Fractured Horizontal Well in Shale Gas Reservoir
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摘要: 页岩气藏开发实践表明,水平井分段压裂是实现页岩气藏经济有效开发的关键技术,其中增产改造体积(SRV)是控制页岩压后效果的核心参数,对SRV的准确计算和表征已成为页岩压裂研究领域的重点难点问题.基于目前SRV评价方法的局限性,考虑动态扩展裂缝与储层应力场和压力场的耦合作用,以及它们实时变化触发储层天然裂缝的破裂机制,建立了一种SRV动态演化计算模型,采用该模型可以计算和表征裂缝动态扩展形态、储层渗透率演化分布以及SRV的空间展布.由于模型与页岩压裂过程中储层SRV实际动态扩展物理机制较一致,采用该模型对SRV的评价计算更符合矿场实际.基于文中提出的计算方法,以威远页岩气开发示范区某压裂井段为例,验证了模型的可靠性,并计算分析了SRV随时间的动态演化过程及变化规律.该文研究对于提升页岩水平井分段分簇压裂SRV计算准确性,提高压裂优化设计以及压后效果评估具有重要的理论指导意义和矿场应用价值.Abstract: For shale gas reservoir, hydraulic fracturing in horizontal well is the key technology to guarantee its commercial exploitation, and the stimulated reservoir volume (SRV) is a critical parameter deciding the post-fracturing performance. The SRV estimation plays an important role in shale gas fracturing design as well as post-fracturing evaluation, so it has become a hot topic in shale fracturing research. Based on the limitations of existing SRV estimation methods, a dynamic evolution model was built to simulate the forming process of the SRV, which coupled several vital processes during shale fracturing, including the formation stress changing, the reservoir pressure rising and the natural fracture failure mechanism. The real physical process of the SRV formation was fully considered in this model, e.g., the non-planar propagation of multiple hydraulic fractures and the SRV extending with the reservoir permeability, etc., so the model can yield more reliable results for field application. The model was firstly validated with calculated results compared with on-site micro-seismic monitored data for a fractured horizontal well in the Weiyuan shale gas field in southwest China, then it was applied to analyze the forming process and extending behavior of the SRV. The research can not only improve the SRV estimation reliability of multi-stage and multi-cluster fracturing in horizontal shale gas wells, but also provide theoretical guidelines and potential applications for fracturing design and post-fracturing evaluation.
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Key words:
- shale /
- horizontal well /
- hydraulic fracturing /
- stimulated reservoir volume /
- stress field /
- pressure field
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