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依据钻进过程中岩屑携带原理 ,设计出一种有利于岩屑携带的切入式喷嘴 ,并对该种喷嘴与导向叶轮式喷嘴、圆射流喷嘴进行了轴向压力分布以及水力携岩能力的试验对比。试验结果表明 ,切入式喷嘴形成的射流在其射流的主体段上轴向压力呈现出“M”形分布 ,其携岩能力最强 ,携岩量随着切入角的增加呈现出先增加后减小的趋势 ,最优携岩喷距与切入角成指数关系。在本试验条件下 ,最优切入角为 6 0°左右 ,在此范围内的最优携岩喷距为无因次喷距的 8.5～ 8.7倍。
According to the principle of debris carrying during drilling, a cut-in nozzle which is favorable to the cuttings carrying is designed, and the axial pressure distribution and hydraulic carrying capacity of this nozzle and the guide impeller nozzle and circular jet nozzle are also studied Test comparison. The experimental results show that the jet formed by the plunge nozzle has the “M” shape axial distribution on the main section of the jet and has the strongest rock carrying capacity. The rock mass increases first and then decreases with the increase of plunging angle The trend of the best carrying rock jet cutting angle into an exponential relationship. Under this test condition, the optimal entry angle is about 6 0 °. The optimum distance of carrying rocks in this range is 8.5 ~ 8.7 times of the dimensionless offset.