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A Three-Segment Hydraulic Model for Cuttings Transport in Horizontal and Deviated Wells

机译：水平井和斜井中钻屑运输的三段水力模型

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摘要

A new approach of three-segment hydraulic model underrntwo-phase (solid-liquid) fluid in annulus; I.e., horizontal andrnnear horizontal section, vertical and near vertical section, andrntransit section is proposed to predict and interpret the cuttingsrntransport mechanism. In particular, the model developed inrnthis paper approaches a three-layer hydraulic modelrn(stationary bed of drilled cuttings at the bottom, a moving-bedrnlayer above it, and a heterogeneous suspension layer at therntop) for horizontal and near horizontal sections. The existingrntwo-layer model is modified for transit section, and one-layerrnmodel is used for the vertical and near vertical sections. Thisrnnew mathematical model is presented to overcome thernlimitations in the existing hydraulic models used to predictrncuttings transport when drilling a horizontal and deviated wells.rnThis paper specifically describes model development forrneach section, solution, and the simulation results of thernintegrated three-segment model. To ensure a comprehensivernunderstanding the effects of parameters affecting cuttingsrntransport efficiency, the simulation under hole cleaning modernwas performed, that involves build-up of cuttings and cleaningrnout an existing cuttings bed. The results show how to obtain arnreasonable pumping velocity and optimize rheology of drillingrnfluid with the possible lowest pressure gradient that mightrnserve as an operational guideline during drilling. Moreover,rnthe effects of various parameters that affect the efficiency ofrncuttings transport are discussed. These results are comparedrnwith published experimental data. The observed agreementrnand discrepancies are discussed, and further improvements onrnthe current model are proposed.
机译：环空两相（固-液）流体三段水力模型的新方法；提出了水平和近水平段，垂直和近垂直段以及过境段来预测和解释the石的运输机理。特别是，本文开发的模型适用于水平和近水平断面的三层水力模型（底部钻屑的固定床，其上方的活动床层以及顶部的非均质悬浮层）。对现有的两层模型进行了修改，对过境断面进行了修改，对垂直和近垂直断面采用了一层模型。提出了这种新的数学模型，以克服现有水力模型在水平井和斜井钻进时预测切屑运移的局限性。本文专门介绍了三段集成模型的每个部分的模型开发，解决方案和模拟结果。为了确保全面了解影响钻屑运输效率的参数的影响，在现代的孔清理下进行了模拟，这涉及到屑的堆积和清理现有的钻屑床。结果表明如何获得合理的抽速并优化钻井液的流变性，并尽可能降低压力梯度，这可能会成为钻井过程中的操作指南。此外，还讨论了影响参数传输效率的各种参数的影响。将这些结果与公开的实验数据进行比较。讨论了观察到的一致性和差异，并提出了对当前模型的进一步改进。

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  • 来源
    《Technology advances》|2000年|p.1-16|共16页
  • 会议地点 Calgary(CA)
  • 作者

    Hyun Cho; N. Shah; Samuel O. Osisanya;

  • 作者单位

    Mewbourne School of Petroleum and Geological Engineering, The University of Oklahoma;

    Mewbourne School of Petroleum and Geological Engineering, The University of Oklahoma;

    Mewbourne School of Petroleum and Geological Engineering, The University of Oklahoma;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 定向钻井;
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