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Investigation of the factors affecting the self‐propelled force in a multi‐orifice nozzle using a novel simulation method
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-05-25 , DOI: 10.1002/ese3.737 Yumei Li 1 , Tao Zhang 1
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-05-25 , DOI: 10.1002/ese3.737 Yumei Li 1 , Tao Zhang 1
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A multi‐orifice nozzle is the primary actuator of radial jet drilling for the stimulation of unconventional and low‐permeability reservoirs. This research developed a 3D flow field simulation model to investigate the self‐propelled force of a multi‐orifice nozzle based on ANSYS‐CFX. To evaluate the self‐propelled ability of the nozzle, investigation was performed on the effects of the angle, number, the diameter of the forward and backward orifices of the multi‐orifice nozzle, and the diameter of the micro‐hole in the radial well on its self‐propelled ability by sensitivity analysis. The results revealed that the self‐propelled force slightly increased with the angle of forward orifice increasing, and decreased with the angle of backward orifice increasing; and that the self‐propelled force had a tendency to decrease significantly with the number of forward orifices increasing, and increased slightly with the number of backward orifices increasing. The self‐propelled forces for different combinations of forward and backward orifices were obtained by the simulation method, which agreed well with those obtained by the calculation method, with an average accuracy of 95.82%. It was observed that the self‐propelled force increased substantially as the value of K (d2/d1) increased, but tended to slow down when the flow rate was within a certain range. Besides, with the increase in the diameter of the micro‐hole, the self‐propelled force reduced, and increased substantially as the inlet flow rate increased, but tended to slow down as the inlet flow rate further increased. Thus, to ensure the self‐propelled ability of the jet nozzle, a set of optimal structural parameters can be used to generate the target self‐propelled ability. The research improves the working performance of multi‐orifice nozzles and provides theoretical guidance for hydraulic radial jet drilling process.
中文翻译：
用新型仿真方法研究多孔喷嘴中自推力的影响因素
多孔喷嘴是径向射流钻井的主要驱动器，用于增产非常规和低渗透油藏。这项研究开发了一个3D流场仿真模型，以研究基于ANSYS-CFX的多孔喷嘴的自推力。为了评估喷嘴的自推进能力，研究了角度，数量，多孔喷嘴的前后孔直径以及径向孔中微孔直径的影响通过敏感性分析确定其自走能力 结果表明，自力随着前孔角度的增加而略有增加，而随着后孔角度的增加而减小。并且自推进力倾向于随着前向节流孔数量的增加而显着降低，而随着向后节流孔数量的增加而略有增加。通过模拟方法获得了前后节流孔不同组合的自推力，与通过计算方法获得的自推力非常吻合，平均精度为95.82％。观察到，随着K（d 2 / d 1）增加，但是当流量在一定范围内时趋于减慢。此外，随着微孔直径的增加，自推进力减小，并随着入口流量的增加而显着增加，但随着入口流量的进一步增加，自推进力趋于降低。因此，为了确保喷嘴的自推能力，可以使用一组最佳结构参数来生成目标自推能力。该研究改善了多孔喷嘴的工作性能，并为液压径向射流钻井过程提供了理论指导。
更新日期：2020-05-25
中文翻译：
用新型仿真方法研究多孔喷嘴中自推力的影响因素
多孔喷嘴是径向射流钻井的主要驱动器，用于增产非常规和低渗透油藏。这项研究开发了一个3D流场仿真模型，以研究基于ANSYS-CFX的多孔喷嘴的自推力。为了评估喷嘴的自推进能力，研究了角度，数量，多孔喷嘴的前后孔直径以及径向孔中微孔直径的影响通过敏感性分析确定其自走能力 结果表明，自力随着前孔角度的增加而略有增加，而随着后孔角度的增加而减小。并且自推进力倾向于随着前向节流孔数量的增加而显着降低，而随着向后节流孔数量的增加而略有增加。通过模拟方法获得了前后节流孔不同组合的自推力，与通过计算方法获得的自推力非常吻合，平均精度为95.82％。观察到，随着K（d 2 / d 1）增加，但是当流量在一定范围内时趋于减慢。此外，随着微孔直径的增加，自推进力减小，并随着入口流量的增加而显着增加，但随着入口流量的进一步增加，自推进力趋于降低。因此，为了确保喷嘴的自推能力，可以使用一组最佳结构参数来生成目标自推能力。该研究改善了多孔喷嘴的工作性能，并为液压径向射流钻井过程提供了理论指导。
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