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首页> 外文期刊>Ground water >Controls of Wellbore Flow Regimes on Pump Effluent Composition
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Controls of Wellbore Flow Regimes on Pump Effluent Composition

机译：井筒流态对泵出水成分的控制

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摘要

Where well water and formation water are compositionally different or heterogeneous, pump effluent composition will vary due to partial mixing and transport induced by pumping. Investigating influences of purging and sampling methodology on composition variability requires quantification of wellbore flow regimes and mixing. As a basis for this quantification, analytical models simulating Poiseuille flow were developed to calculate flow paths and travel times. Finite element modeling was used to incorporate influences of mixing. Parabolic velocity distributions within the screened interval accelerate with cumulative inflow approaching the pump intake while an annulus of inflowing formation water contracts uniformly to displace an axial cylinder of pre-pumping well water as pumping proceeds. Increased dispersive mixing forms a more diffuse formation water annulus and the contribution of formation water to pump effluent increases more rapidly. Models incorporating viscous flow and diffusion scale mixing show that initially pump effluent is predominantly pre-pumping well water and compositions vary most rapidly. After two screen volumes of pumping, 94% of pump effluent is inflowing formation water. Where the composition of formation water and pre-pumping well water are likely to be similar, pump effluent compositions will not vary significantly and may be collected during early purging or with passive sampling. However, where these compositions are expected to be considerably different or heterogeneous, compositions would be most variable during early pumping, that is, when samples are collected during low-flow sampling. Purging of two screen volumes would be required to stabilize the content and collect a sample consisting of 94% formation water.
机译：在井水和地层水的成分不同或不均一的情况下，由于泵送引起的部分混合和输送，泵出水成分将有所不同。要研究吹扫和取样方法对成分变异性的影响，需要对井眼流态和混合情况进行量化。作为此量化的基础，开发了模拟Poiseuille流动的分析模型以计算流动路径和行进时间。有限元建模用于合并混合的影响。筛选间隔内的抛物线速度分布随着累积流入量接近泵入口而加速，而随着泵送的进行，流入地层水的环空均匀收缩，以置换轴向泵入的预泵井水。分散混合的增加形成了更分散的地层水环面，并且地层水对泵出水的贡献更快地增加。包含粘性流和扩散垢混合的模型表明，最初的泵出水主要是预先泵入井水，并且组成变化最快。经过两次筛滤后，有94％的泵流出物流入地层水。在地层水和预抽井水的组成可能相似的情况下，泵出水的组成不会显着变化，可以在早期吹扫或被动采样期间收集。但是，如果预计这些成分会显着不同或不均匀，则在早期泵送期间（即在低流量采样期间收集样本时），成分变化最大。需要清洗两个筛网体积以稳定含量并收集由94％地层水组成的样品。

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  • 来源
    《Ground water》 |2014年第1期|96-104|共9页
  • 作者

    James M. Martin-Hayden; Mitchell Plummer; Sanford L. Britt;

  • 作者单位

    Department of Environmental Sciences, University of Toledo, Toledo, OH 43606;

    ldaho National Laboratories, Idaho Falls, ID 83415 (208)526-2785;

    ProHydro Inc., Rochester, NY 14450 (585) 385-0023;

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