【摘要】 针对常规连续管射流工具压耗高、作用方式单一等问题，基于现行?43 mm多孔射流工具开展内部结构的优化设计，利用数值模拟软件Fluent分析了配置不同数量喷嘴下各喷嘴的压力、流量以及涡流形成后的压力场和速度场，并进行了室内试验验证。研究和试验结果表明：在不同排量条件下，缩径对工具流量系数的影响范围为2.1%～19.2%，并随排量增加而扩大；通过伯努利方程、连续性方程和喷嘴压降云图分析发现，流体流动不稳定和局部压力过高是导致工具流量系数降低的主要原因；通过伯努利方程和连续性方程推导的截面积比与压降变化曲线显示，在0.1～0.6直径比值区域，增加直径比值，压降显著减小，而在0.6～1.0直径比值区域，增加直径比值对压降的影响逐渐减弱，同时截面积比由0.178增加到0.400时，压降相对变化率减少约80%，说明缩径对压降的影响显著；通过室内试验进一步验证了实际通径面积与流量系数的关系，分析发现冲洗工具的局部损失系数呈现出与雷诺数无关的常数特性，表明其主要与工具内部结构密切相关。所得结论可为优化连续管冲洗工具结构设计、提升油田清洗作业效率提供理论依据和方向。更多还原

【Abstract】 To address the issues of high-pressure loss and single action mode of conventional coiled tubing jet tools, an optimization design of the internal structure was carried out based on the current ?43 mm multi-orifice jet tool. Then, the numerical simulation software Fluent was used to analyze the pressure and flow rate of each nozzle under different nozzle configurations as well as the pressure field and velocity field after the formation of eddy current. Finally, a laboratory test was conducted for validation. The research and test results show that at varying flow rates, the influence of reducing diameter on the flow coefficient of the tool ranges from 2. 1% to 19. 2%, and it expands with the increase of flow rate. Through the analysis of Bernoulli’s equation, continuity equation and nozzle pressure drop contour, it is found that the instability of fluid flow and the high local pressure are the main reasons for the decrease of tool flow coefficient. The cross-sectional area ratio and pressure drop variation curve derived by Bernoulli’s equation and continuity equation show that in the diameter ratio range of 0. 1-0. 6, increasing the diameter ratio leads to a significant reduction in pressure drop, while in the diameter ratio range of 0. 6-1. 0, the influence of increasing diameter ratio on pressure drop gradually weakens; meanwhile, when the cross-sectional area ratio increases from 0. 178 to 0. 400, the relative change rate of pressure drop decreases by about 80%, indicating that reducing diameter has an obvious influence on pressure drop. Through laboratory test on the relationship between the actual drift diameter area and the flow coefficient, it is found that the local loss coefficient of the flushing tool exhibits a constant characteristic independent of the Reynolds number, indicating that it is mainly closely related to the internal structure of the tool. The research and test results provide a theoretical basis and direction for optimizing the structural design of coiled tubing flushing tool and improving the clean-out operation efficiency of oilfields.更多还原