页岩气储层水力压裂复杂裂缝导流能力实验研究

发布时间：2019-06-01 14:06

【摘要】：为研究页岩气储层水力压裂后复杂裂缝导流能力,运用FCES-100裂缝导流仪,选取页岩地面露头岩心,加工成符合实验要求尺寸岩心板,将页岩复杂裂缝简化为转向裂缝和分支裂缝两种形式,用陶粒和覆膜砂两种类型支撑剂进行导流能力实验测试。实验结果表明:裂缝形态对导流能力影响较大,裂缝转向后导流能力明显低于单一裂缝,低闭合压力条件下转向裂缝与单一裂缝导流能力相差35%~40%,随闭合应力增大,差距逐渐增大;低闭合压力下陶粒导流能力高于覆膜砂,而当闭合压力增大后覆膜砂的导流能力反超陶粒,低铺砂浓度下反超趋势更加明显;分支裂缝存在时,等量支撑剂多条分支裂缝的等效导流能力小于单一裂缝,高闭合压力下分支裂缝中不同分支铺砂浓度的差异越大,导流能力与单一裂缝越接近。
[Abstract]:In order to study the complex fracture conductivity of shale gas reservoir after hydraulic fracturing, the core of shale surface outcrop was selected by using FCES-100 fracture diversion instrument and processed into core plate in accordance with the experimental requirements. The complex fractures of shale are simplified into two forms: steering fracture and branch fracture. The conductivity of shale is tested by ceramsite and coated sand. The experimental results show that the fracture shape has a great influence on the diversion capacity, and the diversion capacity after the crack steering is obviously lower than that of the single crack. Under the condition of low closed pressure, the difference between the diversion capacity of the steering crack and the single crack is 35% 鈮，

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