大洋钻探井下流体取样离心泵流动特性及性能解析
吴川 , 黄舟舟 , 刘天乐 , 田烈余 , 熊亮 , 雷刚 , 郑少军 , 蒋国盛
地球科学 ›› 2026, Vol. 51 ›› Issue (8) : 3213 -3223.
大洋钻探井下流体取样离心泵流动特性及性能解析
Flow Characteristics and Performance Analysis of Centrifugal Pumps for Fluid Sampling in Deep Ocean Drilling Wells
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为提升大洋钻探井下流体原位取样系统的稳定性与效率,基于计算流体动力学方法,构建了取样离心泵三维湍流模型,并系统分析了其在1 450 r/min至4 000 r/min转速范围内的压力分布、速度场、阻力特性及能量损失规律. 结果表明2 000 r/min为最优转速,在此转速下泵内压力场可达8 030 Pa且最为稳定,同时最大流速为3.46 m/s且速度分布合理. 此外,该转速下多相流与单相流的阻力系数差值最小,并且流速波动仅为0.23%,取样体积最大误差为4.75%,表现出优异的流动稳定性与取样精度. 在效率方面,泵的峰值效率约62.7%,对应最优流量为2×10-4 m³/s. 同时泵体采用钛合金材料并控制流量在高效区间,可保障泵在深海复杂介质环境中的长效可靠运行.
To enhance the stability and efficiency of the in⁃situ fluid sampling system for deep⁃sea drilling, this study, based on computational fluid dynamics (CFD) methods, constructed a three⁃dimensional turbulence model for the sampling centrifugal pump. A systematic analysis was conducted on its pressure distribution, velocity field, drag characteristics, and energy loss patterns within the rotational speed range of 1 450 r/min to 4 000 r/min. The results indicate that 2 000 r/min is the optimal rotational speed. At this speed, the pressure field within the pump reaches 8 030 Pa and is most stable, with a maximum flow velocity of 3.46 m/s and a reasonable velocity distribution. Furthermore, at this speed, the difference in drag coefficients between multiphase flow and single⁃phase flow is minimal, and the flow rate fluctuation is only 0.23%. The maximum error in sampling volume is 4.75%, demonstrating excellent flow stability and sampling accuracy. In terms of efficiency, the peak efficiency of the pump is approximately 62.7%, corresponding to an optimal flow rate of 2×10-4 m³/s. Additionally, the pump body is constructed from titanium alloy and the flow rate is controlled within the high⁃efficiency range, ensuring long⁃term reliable operation of the pump in complex deep⁃sea media environments.
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国家重点研发计划项目(2024YFC2814304)
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