致密火山岩储层水平井压裂参数优化与现场试验

致密火山岩储层天然裂缝发育差,低孔、低渗、致密、非均质性强,需要应用水平井大规模分段压裂工艺实现有效开发。随着储层物性变差,可缩小压裂裂缝间距保持单井产量;为明确最优改造裂缝间距与施工规模,基于储层孔渗特征、相渗特征、流动特征的认识以及不同裂缝间距压裂产生的干扰,确定致密火山岩储层最优改造裂缝间距。应用压裂后分段产气监测,认识分段产量与改造规模关系,明确致密火山岩储层最优改造规模,有效指导压裂方案优化,提高设计针对性与开发效益。

Fracturing parameter optimization and field test of horizontal wells in tight volcanic reservoirs

The tight volcanic reservoir is characterized by poor development of natural fractures,low porosity,low permeability,compactness and strong heterogeneity,which requires the application of large-scale staged horizontal well fracturing technology to achieve effective development.With the deterioration of reservoir physical properties,the fracturing fracture spacing can be reduced to maintain single well production;in order to determine the optimal fracture spacing and construction scale,based on the understanding of reservoir porosity and permeability characteristics,relative permeability characteristics and flow characteristics,and the interference caused by fracturing with different fracture spacing,the optimal fracture spacing of tight volcanic reservoir is determined.Through the application of staged gas production monitoring after fracturing,the relationship between staged production and reconstruction scale is understood,and the optimal reconstruction scale of tight volcanic reservoir is determined,which can effectively guide the optimization of fracturing scheme and improve the efficiency and benefit of the design and development.