The combination of the fluid powered central hollow DTH hammer with the hydraulic reverse circulation con coring process eliminates the core blockage, resulting in higher drilling efficiency and longer bit life, and providing a good application prospect
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蒋荣庆,沈崇峰,殷琨,等.液动贯通式冲击器用于水力反循环连续取心钻进[J].钻探工程,1998,(3):27-28.Jiang Rongqing Shen Chongfeng Yin Kun Gu Hualiang. Hydraulic Reverse Circulation Con coring Using the Fluid Powered Central Hollow DTH Hammer[J]. Drilling Engineering, 1998,(3):27-28.