
水力压裂技术通过形成人工裂缝提升非常规油气产能,而支撑剂在裂缝中的运移沉降直接影响裂缝的导流能力,进而影响增产效果。学者们对单一裂缝内支撑剂的运移规律已进行了大量研究,但对复杂裂缝的分支裂缝中支撑剂的分布规律研究还不够深入。支撑剂类型可分为传统支撑剂和新型支撑剂,研究方式分为物理实验和数值模拟,研究参数包括注入流速、压裂液黏度、分支缝位置、分支缝与主裂缝夹角、壁面粗糙度以及支撑剂粒径、浓度、密度、形状和不同粒径组合等。单一裂缝研究表明,脉冲加砂、气悬浮支撑剂与超低密度支撑剂能显著提升支撑剂铺置的均匀性和裂缝导流能力;复杂裂缝研究表明,注入流速、分支缝位置和夹角、裂缝粗糙度等对支撑剂分布有明显影响。CFD-DEM耦合模型能更准确地反映颗粒-流体-壁面之间的相互作用,尤其在复杂裂缝中表现出较强适应性。现有研究多基于光滑裂缝与球形支撑剂,缺乏对真实裂缝粗糙度、流体泄漏及非球形支撑剂的深入探讨。未来需构建更贴合现场情况的实验平台,完善裂缝结构与支撑剂形态的模拟精度,使物理实验和数值模拟结果更加可靠。
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