为了解决高压射流钻进超短半径水平井技术中钻孔直径与钻孔深度间的矛盾问题,在考虑液固两相相间作用力的基础上,采用连续介质假设,依据液固两相双流体模型,对超短半径水平井钻头喷嘴内液固多相射流进行了模拟研究,并将结果同单相射流进行了对比。对比结果显示：单相与多相两种情况下液相轴线速度分布趋势基本相同,喷嘴轴线上湍流强度发展趋势一致;但当流动进入喷嘴直柱段并逐渐向出口运动时,单相射流液相轴线速度要低于多相情况下液相轴线速度,单相射流的湍流强度要高于多相射流条件下湍流强度;在喷嘴出口截面上,越靠近轴心液相速度越接近%In order to solve the contradiction between borehole diameter and the depth of borehole of high-pressure jet drilling in ultra-short radius horizontal wells,on the basis of considering the inter-phase forces both liquid phase and solid phase,used the continuum medium,according to the liquid-solid two-phase two-fluid model,the liquid-solid multiphase jet in bit nozzle of ultra-short radius horizontal well was simulated and investigated,and the results were contrast with the same single-phase jet.The results show that the velocity distribution trends of liquid phase axis in single phase and multiphase two cases are basically the same,but when the liquid flow into the straight cylinder segments of the nozzle and move to the export gradually,the liquid-phase axis speed of the single phase jet is lower than the multi-phase liquid.On section of the nozzle export,axis is closer,the liquid-phase velocity is nearer in the both cases,the wall is closer,and the difference of the liquid-phase velocity is greater in both cases.Solid particles exist the velocity ahead sliding phenomenon in the inner wall of the nozzle.On axis of the nozzle,the intensity of turbulence have the same development trend in both cases,when the liquid flow into the straight cylinder segments of the nozzle and move to the export gradually,the intensity of turbulence of the single phase jet is higher than the multi-phase liquid.
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