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Mathematical model for formation decontamination by pumping with well bore mixing

机译：井筒混合泵抽除地层的数学模型

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摘要

This work presents a novel mathematical model to evaluate the effect of pumped well bore mixing volume on formation decontamination. The model equation is solved by the Laplace transform finite difference method. The developed model is applied to assess the effect of well bore mixing volume on contaminant remediation. The simulated results indicated that the well bore volume effect is pronounced for initial plumes with a small maximum contaminated radius, and in media such as bedrock formation where aquifer porosity and longitudinal dispersivity are small. In such systems, the pumped well bore mixing effect reduces the early contaminant concentrations, shifts the peak breakthrough curves to the right and spreading the breakthrough curve, and thus increases the decontamination time. If such a system does not account for pumped well mixing bore effect, estimates of decontamination time required to the regulatory level will be inaccurate. well bore mixing; formation; decontamination; pumping
机译：这项工作提出了一种新颖的数学模型，以评估抽水井筒混合体积对地层净化的影响。通过拉普拉斯变换有限差分法求解模型方程。将开发的模型用于评估井筒混合量对污染物修复的影响。模拟结果表明，对于最大污染半径较小的初始羽状流以及在含水层孔隙度和纵向分散性较小的基岩形成等介质中，井筒体积效应是明显的。在这样的系统中，泵送的井筒混合效应降低了早期的污染物浓度，将峰值穿透曲线向右移动并扩展了穿透曲线，从而增加了净化时间。如果这样的系统不能解决泵井混合井筒的影响，那么达到规定水平所需的净化时间估计将不准确。井筒混合；编队去污;抽水

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