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Comparison of numerical analysis on the downhole flow field for multi-orifice hydrothermal jet drilling technology for geothermal wells

机译：地热井多孔热液喷射钻井技术井下流场数值分析的比较

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摘要

Newly developed hydrothermal jet drilling technology has the potential of being economically advantageous over conventional drilling techniques for drilling deep wells in hard formations. By applying coiled tubing techniques and modulating fluid media in the bottomhole reaction chamber, there can be a high temperature and high velocity jet striking and conducting heat to break the rock. So far, there has been no specific study on the influence of nozzle structure on the flow field of multiple hydrothermal jets. This paper presents hydro thermal jet models with different numbers of orifices to investigate the features of flow field, carrying capacity, drilling ability and cooling effect. Results show that for two models in the absence of cooling water, the bottomhole center temperature and pressure are higher than the two sides under multiple hydrothermal jets conditions. This is similar to the flow pattern for a single jet. Additionally, for the five-orifice nozzle with cooling water injected, the entire high temperature region is cylindrical. Ambient cooling water envelops the inner hot water. By comparing different models, the five-orifice nozzle model without cooling water shows a circular symmetric distribution of the bottomhole temperature. With cooling water injected, the central high temperature region becomes rectangular, while the margin of the well bottom is cooled by the peripheral cooling water. The bottom rock average temperature in five-orifice model is lower than for the four-orifice model due to more drastic thermal and kinetic transfer between the hydrothermal jet and the cooling water. The five-orifice nozzle model is better than the four-orifice nozzle model in terms of bottomhole temperature, bottomhole pressure and carrying capacity. Therefore, the five-orifice nozzle should be adopted for hydrothermal jet drilling. It is also feasible to pump down relatively high temperature cooling water to guarantee the high temperature downhole environment. Meanwhile, the cooling water pressure should be controlled during the drilling process for better cooling efficiency. All results in this paper are relevant to the parameters design for multi-orifice hydrothermal jet drilling technology.
机译：新开发的热液喷射钻井技术具有比常规钻井技术在经济上具有优势的潜力，可用于在坚硬地层中钻深井。通过应用连续油管技术并调节井底反应室中的流体介质，可能会有高温和高速射流撞击并传导热量使岩石破裂。迄今为止，尚未对喷嘴结构对多个热液射流流场的影响进行具体研究。本文提出了具有不同节流孔数的水力热力喷射模型，以研究流场，承载能力，钻井能力和冷却效果的特征。结果表明，对于两种没有冷却水的模型，在多次热液喷射条件下，井底中心温度和压力均高于两侧。这类似于单个喷嘴的流动模式。另外，对于注入冷却水的五孔喷嘴，整个高温区域是圆柱形的。环境冷却水包裹着内部热水。通过比较不同的模型，不带冷却水的五孔喷嘴模型显示出井底温度呈圆形对称分布。注入冷却水后，中央高温区域变为矩形，而井底的边缘被周围的冷却水冷却。五孔模型的底部岩石平均温度低于四孔模型，这是因为热液射流和冷却水之间的热力和动力传递更加剧烈。在井底温度，井底压力和承载能力方面，五孔喷嘴模型优于四孔喷嘴模型。因此，在热液喷射钻井中应采用五孔喷嘴。抽出较高温度的冷却水以保证高温井下环境也是可行的。同时，在钻孔过程中应控制冷却水压力，以提高冷却效率。本文所有结果均与多孔热液喷射钻井技术的参数设计有关。

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  • 来源
    《Geothermics》 |2017年第11期|314-323|共10页
  • 作者

    Song Xianzhi; Lyu Zehao; Cui Liu; Li Gensheng; Ji Guodong; Pang Zhaoyu;

  • 作者单位

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    CNPC Drilling Res Inst, Beijing 102206, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    CNPC Drilling Res Inst, Beijing 102206, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hydrothermal jet; Drilling performance; Flow field; Numerical simulation;

    机译：热液喷射钻井性能流场数值模拟;

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