Experimental Study and Numerical Analysis on the Pulling Force ofSelf-Propelled Straight-Swirling Integrated Jet Bit
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摘要: 为探究径向侧钻微小井眼反喷牵引射流钻头自进力的主要影响因素，以反喷牵引直旋混合射流钻头的结构为基础，采用实验研究与数值模拟相结合的方法，研究了入口流量、井筒直径、正向喷距等因素对射流钻头自进力的影响规律。结果表明：反喷牵引直旋混合射流钻头的自进力大小受入口流量、井筒直径、实际正反流量比、返流强度等多种因素的综合影响；增大入口流量，增强射流钻头正、反向射流卷吸降压效果，有利于增大自进力；随着井筒直径的增加，反向射流的封隔效果减弱，返流干扰降低，自进力先增大后减小，并且在给定的流量下，存在获得最大自进力的井径范围。研究结果可为径向水平井射流钻头参数的优化设计与选取提供依据。Abstract: In order to investigate the main factors influencing the pulling force of a self-propelled straight-swirling integrated jet bit, we studied the effects of the inlet flow rate, wellbore diameter, and spray distance on the pulling force by combining experimental measurements and numerical simulations.The results show that the pulling force of the jet bit is influenced by the inlet flow rate, the well diameter, the flow rate ratio of forward and backward flows and the return flow in the wellbore.As the inlet flow rate increases, the pressure-reducing effects of the forward and backward jet rise, which is beneficial to the increase of the pulling force; when the wellbore diameter increases, the jet-sealing effects and the backflow interference will be weakened, leading to the pulling force increasing at first and then decreasing.At a designated inlet flow rate, an optimal wellbore diameter range can be obtained with the maximum pulling force.This work provides a significant reference for optimizing the design of jet bit parameters in radial horizontal wells.
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Key words:
- high-pressure jet /
- pulling force /
- self-propelled jet bit /
- micro-hole
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图 1 反喷牵引直旋混合射流钻头的结构示意图
Figure 1. Schematic illustration of the self-propelled straight-swirling integrated jet bit
图 4 直旋混合射流钻头示意图
Figure 4. Schematic illustration of straight-swirling integrated jet bit
图 5 井眼内反喷牵引直旋混合射流钻头的三维数值分析模型图
Figure 5. Three dimensional numerical simulation model of self-propelled straight-swirling integrated jet bit in the well
表 1 实验及数值模拟参数
Table 1. Parameters of the experiment and numerical simulation
No. Q/(L/min) D/(mm) H/(mm) 1# 42.5, 48.5, 50.1, 56.1, 60.0 50 20 2# 56.1 30, 40, 50, 60, 70 20 3# 56.1 50 10, 20, 30, 40, 50 
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