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本文阐述了高压喷射钻井原理,结合流体力学理论,建立高压喷射钻井井底流场模型。通过研究三牙轮钻头几何特征,利用三维实体建模软件建立三牙轮钻头实体模型,得到井底流场流道的物理模型,并对模型进行网格划分,通过数值运算方法,模拟了不同泵压、排量下井底的速度和压力分布。在数值模拟的基础上,对高压喷射钻井在现场的提速效果进行了分析和总结,提出了合理的喷嘴组合和钻井参数。本文的研究结果对正确认识喷射钻井的提速原理以及选择合理的喷嘴组合、排量有重要理论意义和实践意义。
This paper describes the principle of high pressure jet drilling, combined with fluid mechanics theory, the establishment of high pressure jet drilling bottom flow field model. By studying the geometric characteristics of tricone bit, the solid model of tricone bit was established by using three-dimensional solid modeling software, and the physical model of flow field in bottom hole flow field was obtained. The model was meshed, and the numerical calculation method was used to simulate different Pumping pressure, displacement under the bottom of the speed and pressure distribution. On the basis of numerical simulation, the speed-raising effect of high-pressure jet drilling on site was analyzed and summarized, and a reasonable nozzle combination and drilling parameters were proposed. The results of this paper have important theoretical and practical significance for correctly understanding the speed-raising principle of jet drilling and choosing a reasonable nozzle combination and displacement.