Utilization of the rotary–percussive drilling tools can help to reduce friction along the drill string and improve drilling performance in hard rock formations. However, intrinsic vibration and shock loads may severely damage the bottom hole assembly (BHA) and measurement while drilling (MWD). This paper investigates the dynamic response of fluidic hammer with hydraulic-damping-device, a rotary–percussive drilling tool which can provide forward percussion while eliminating harmful backward impact collisions. Descriptive statistical methods are introduced to accurately estimate the required damping length (RDL) and maximize the actual stroke length. In order to evaluate the influence of hydraulic-damping-device on vibration elimination, this paper discusses the effect of principal operating and design parameters on the dynamic responses of the fluidic hammer. In particular, a parametric model is fitted, in which the probability that backward impact collision is sufficiently eliminated is restricted to follow the probability density function. According to this function, when the damping stroke equals 10 mm, it is better than 99.999% to fully eliminate the possibility of backward collision. The improved understanding of the dynamic responses and some optimization proposals of a fluidic hammer will lead to the system reliability enhancement and cost optimization of the drilling engineering by eliminating the harmful shock and reducing shock-related tool failures.

旋转冲击钻具的使用可以帮助减少沿钻柱的摩擦并提高硬岩层的钻探性能。但是，固有的振动和冲击载荷可能会严重损坏井底组件（BHA）和随钻测量（MWD）。本文研究了带有液压阻尼装置的液压锤的动力响应，液压阻尼装置是一种旋转冲击钻具，可以提供向前的撞击，同时消除了有害的向后撞击。描述性统计方法被引入以准确估计所需的阻尼长度（RDL）并最大化实际的笔划长度。为了评估液压阻尼装置对消除振动的影响，本文讨论了主要操作和设计参数对流体锤动力响应的影响。特别地，拟合参数模型，其中充分消除了向后碰撞的可能性被限制为遵循概率密度函数。根据此功能，当阻尼行程等于10 mm时，完全消除后向碰撞的可能性要优于99.999％。