Optimization of injection and production parameters for ultra-low permeability reservoirs considering starting pressure gradient and stress sensitivity
L reservoir in the target block is a typical low-porosity and ultra-low permeability reservoir with obvious nonlinear flow characteristics and strong reservoir stress sensitivity,which makes it difficult to establish effective displacement between injection and production wells,and further aggravates the difficulty of reservoir development due to the well-developed reservoir interlayers and the unreasonable matching between injection and production parameters and well pattern system.To solve these problems,a detailed numerical model with well-developed interlayers was established,and its adverse effects on productivity were quantified,taking into account the starting pressure gradient and stress sensitivity,and the injection and production parameters of the entire well pattern system were optimized.The results show that:1)Starting pressure gradient and stress sensitivity have a greater impact on productivity in the early stage of development,and the impact of starting pressure gradient on productivity is greater than that of stress sensitivity,while water cut rise becomes the main factor affecting productivity in the later stage of development;2)For the well pattern system,the target reservoir can achieve better development results when the injection intensity is 1.94 m3/d·m.The advanced injection time is nine months,the reasonably advanced injection water per well is about 5 600 m3,and the advanced injection pressure is maintained at 132％.The research results provide a method and technology reference for improving the waterflood development effect of L reservoir and similar reservoirs.
injection and production parametersstarting pressure gradientstress sensitiveultra-low permeability reservoirinjection and production pattern
万方数据
维普
