泡沫在裂缝中流动特征的物理模拟

发布时间：2019-08-16 11:44

【摘要】：针对泡沫流体的流动特性,设计岩石裂缝模型和可视化裂缝模型,研究泡沫在裂缝中的流动特征并与气液两相流进行对比。研究结果表明:在可视化裂缝模型中,当气液比升高时,气液两相流容易形成气窜带,引起两相流整体流动性增强,而泡沫运移的阻力则出现升高;当流速升高时,气液两相流压力梯度呈现线性增大,而在泡沫中,低速阶段压力梯度增幅较小,高速阶段压力增幅梯度相对增大;裂缝的粗糙度会改变泡沫的微观结构进而影响泡沫的流动特征。在岩石裂缝模型中,当气液比较低时,气液两相流的流动阻力随气液比的增大而升高。当气液比大于2.5后,不同流速下气液两相流的压力梯度均开始随气液比的增高而下降,在不同气液比下泡沫的压力梯度要比两相流的高,不同的注入速度下的泡沫流动的压力梯度均随气液比的增大而升高;当注入速度增大时,两相流及泡沫的流动的压力梯度均基本呈现线性升高。
[Abstract]:According to the flow characteristics of foam fluid, the rock fracture model and visual fracture model are designed, and the flow characteristics of foam in fracture are studied and compared with gas-liquid two-phase flow. The results show that in the visual fracture model, when the gas-liquid ratio increases, the gas-liquid two-phase flow is easy to form a gas channeling zone, which leads to the enhancement of the overall mobility of the two-phase flow, while the resistance of foam migration increases. When the velocity increases, the pressure gradient of the gas-liquid two-phase flow increases linearly, while in the low-speed stage, the pressure gradient increases relatively. The roughness of cracks will change the microstructure of foam and then affect the flow characteristics of foam. In the rock fracture model, when the gas-liquid ratio is low, the flow resistance of gas-liquid two-phase flow increases with the increase of gas-liquid ratio. When the gas-liquid ratio is greater than 2.5, the pressure gradient of gas-liquid two-phase flow begins to decrease with the increase of gas-liquid ratio, and the pressure gradient of foam flow is higher than that of two-phase flow under different gas-liquid ratio, and the pressure gradient of foam flow increases linearly with the increase of gas-liquid ratio, and when the injection velocity increases, the pressure gradient of two-phase flow and foam flow increases linearly.
【作者单位】：中国石油大学(华东)石油工程学院;
【基金】：国家自然科学基金资助项目(51574264) 山东省自然科学基金资助项目(ZR2015EL015) 国家高技术研究发展计划(863计划)项目(2013AA064803) 国家科技重大专项(2011ZX05051003)~~
【分类号】：TE357.46

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