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通过对磨料射流辅助三翼钻头破碎岩石的力学分析,理论上给出了提高钻进速度的依据,利用自行设计的磨料射流实验系统,采用收敛型喷嘴以不同泵压对预制水泥试件进行冲蚀实验,试验研究表明,在泵压及磨料浓度保持不变的情况下,随着冲蚀深度(靶距)的增加,磨料射流的破岩能力先增大后减小,呈抛物线型变化,存在破碎的最优靶距;随着试件硬度的增加,破岩速度减小,冲蚀深度减小,但破岩最优靶距没有变,同一靶距下,破岩速度变小;随着泵压的增大,磨料射流的最优靶距随之增大,最优靶距受喷嘴加速直线段长度的影响;通过致密砂岩的钻进对比实验得出,在同等扭矩及推力条件下,磨料射流辅助钻进的效率可以提高63.4%.
By analyzing the mechanics of abrasive jet-assisted three-wing drill broken rock, theoretically, the basis of improving the drilling speed is given. By using the self-designed abrasive jet experimental system, the converging nozzle is used to pump the precast concrete specimens with different pumping pressures The experimental results show that with the increase of erosion depth (target distance), the rock breaking ability of abrasive jets first increases and then decreases with the pump pressure and abrasive concentration remain the same, showing a parabolic change, With the increase of the hardness of the specimen, the rock breaking speed decreases and the erosion depth decreases, but the optimal target distance of rock breaking has not changed, and the rock breaking speed becomes smaller under the same target distance; With the increase of pump pressure, the optimal target distance of abrasive jet increases, and the optimal target distance is affected by the length of straight line accelerated by nozzle. Comparing with the drilling experiment of tight sandstone, under the condition of equal torque and thrust , Abrasive jet assisted drilling efficiency can be increased 63.4%.