固化堵漏浆井下运移数值模拟研究
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Numerical Simulation Study on the Migration of Consolidateable Plugging Slurry in Downhole
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    摘要:

    固化堵漏是一种治理油气井钻井液漏失的有效手段,揭示堵漏浆体在井筒-裂缝中运移规律,构筑连续的固化体是该技术需要解决的关键问题之一。为此,采用计算流体力学数值模拟方法,建立井筒压力动态变化的垂直裂缝固化堵漏模型,分析宾汉流型堵漏浆的密度、塑性黏度、动切力、排量以及裂缝开度等因素对堵漏浆运移的影响。结果表明:注浆过程中,低密度的堵漏浆优先进入垂直裂缝的上部,而高密度堵漏浆优先进入垂直裂缝中部,并出现明显混浆现象;堵漏浆在裂缝中水平方向较竖直方向运移更快;低黏度的堵漏浆更容易进入裂缝中,黏度越大堵漏浆在裂缝出口达到相同体积分数的时间越长,体积分数越高堵漏浆顶替钻井液效率越低;动切力对堵漏浆在井筒-裂缝中运移的影响不显著;排量越小或裂缝开度越大,裂缝出口堵漏浆瞬时流量占比增加越快,进入地层深部堵漏浆体积占比越大,裂缝出口达到相同体积分数需要的堵漏浆体积越小。数值模拟的结果对固化堵漏方案制定具有一定的理论指导意义。

    Abstract:

    Consolidation plugging is an effective means to control drilling fluid leakage in oil and gas wells. Revealing the migration law of plugging slurry in wellbore-fracture and constructing continuous solidified body is one of the key problems to be solved in this technology. Therefore, the CFD numerical simulation method is adopted. A numerical model of vertical fracture consolidation plugging with dynamic change of wellbore pressure is established. The effects of density, plastic viscosity, yield stress, displacement and fracture opening of Bingham flow plugging slurry on the migration of plugging slurry were analyzed. The research shows that during the grouting process, the low-density plugging slurry preferentially enters the upper part of the vertical crack. The high-density plugging slurry preferentially enters the middle of the vertical fracture, and there is obvious mixing phenomenon. The plugging slurry migrates faster in the horizontal direction than in the vertical direction in the fracture. The plugging slurry with low viscosity is easier to enter the fracture. The higher the viscosity is, the longer the time for the plugging slurry to reach the same volume ratio at the fracture outlet is. The higher the volume ratio is, the lower the efficiency of plugging slurry replacing drilling fluid is. The effect of yield stress on the migration of plugging slurry in wellbore-fracture is not significant. The smaller the displacement or the larger the crack opening, the faster the instantaneous flow rate of the plugging slurry at the crack outlet increases, the larger the volume of the plugging slurry entering the deep part of the formation, and the smaller the volume of the plugging slurry required to reach the same volume ratio at the crack outlet. The results of numerical simulation have certain theoretical guiding significance for the formulation of curing plugging scheme.

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彭力,于春勇,董易凡,史野,蔺艺莹,张鹏,李秀妹.固化堵漏浆井下运移数值模拟研究[J].科技与产业,2025,25(01):16-24

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  • 在线发布日期: 2025-01-23
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