地热井钻井过程中钻井液热物理性质对井筒温度压力的影响
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1.西南石油大学石油与天然气工程学院;2.西南油气田川中油气矿;3.西南石油大学机电工程学院

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TE254

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国家自然基金面上项目(52374011);西南石油大学油气藏地质与开发国家重点实验室开放基金(PLN2022-46)


Influence of thermal physical properties of drilling fluid on wellbore temperature and pressure during geothermal well drilling
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1.School of Petroleum and Natural Gas Engineering,Southwest Petroleum University;2.Oil and gas deposits in Southwest Oil and Gas Field;3.School of Mechanical and Electrical Engineering,Southwest Petroleum University

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    摘要:

    随着能源行业的发展以及世界能源需求的不断增长,地热资源勘探开发的难度不断增加,深层、超深层地热资源已经成为新能源行业开发的重点方向。随着地热井钻进深度的不断增加,钻井液热物理性质随温度压力变化对井筒温度压力的计算将会产生更为显著的影响。本文建立了地热井钻井过程中井筒瞬态温度压力耦合数值模型,研究了地热井钻井过程中钻井液的密度和粘度随温度压力变化对井筒温度压力计算的影响。计算结果表明,钻井液的粘度和密度对井筒温度的计算结果具有重要的影响,与不考虑粘度随温度变化的情况下相比,考虑粘度随温度变化的情况下井底温度的计算结果高出3.1%,考虑粘度和密度同时随温度压力变化的情况下井底温度的计算结果高出4.99%。可见,为了提高计算精度,在进行地热井井筒温度压力计算时应当充分考虑钻井液的热物理性质随温度压力变化的影响。

    Abstract:

    With the development of the energy industry and the continuous growth of global energy demand, the exploration and development of geothermal resources have become increasingly difficult. Deep and ultra-deep geothermal resources have been identified as a key direction for the development of the new energy industry. As the drilling depth for geothermal wells continues to increase, the thermal and physical properties of the drilling fluid are found to have a more significant impact on the calculation of wellbore temperature and pressure amid changes in temperature and pressure. In this article, a coupled numerical model of transient temperature and pressure in the wellbore during the drilling of geothermal wells is established, and the influence of the density and viscosity of drilling fluid on the calculation of wellbore temperature and pressure with changes in temperature and pressure during the drilling of geothermal wells is studied. It is shown by the calculation results that the viscosity and density of the drilling fluid significantly affect the calculation of wellbore temperature. When the changes in viscosity with temperature are considered, the calculation results of wellbore temperature are found to be 3.1% higher, and when changes in viscosity and density with both temperature and pressure are considered simultaneously, the results are 4.99% higher, compared with the case where changes in viscosity with temperature are not taken into account; To improve the accuracy of calculations, the thermal and physical properties of drilling fluid should be fully considered in calculating the temperature and pressure of geothermal wells.

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张政,袁健鹏,马蠡,等. 地热井钻井过程中钻井液热物理性质对井筒温度压力的影响[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-04-03
  • 最后修改日期:2024-06-07
  • 录用日期:2024-07-09
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