对于某些应用，震击器扭转是一个众所周知的服务质量问题，特别是在相对较大的钻孔尺寸（例如 22 英寸和 16 英寸）中。震击器是钻柱中最薄弱的点之一，因为运动部件形状复杂，导致应力集中。完整的论文介绍了一项研究结果，重点是将震击器放置在底部钻具组合 (BHA) 中，以减少震击器连接处的弯矩和弯曲应力。因此，钻井过程中发生扭转的风险被最小化，同时在发生卡住事件时仍能保持震击器的有效性。
在本研究中描述的应用中，震击器传统上放置在钻铤之间。
Jar twistoff is a well-known service quality issue for some applications, especially in relatively large borehole sizes such as 22 and 16 in. The jar is one of the weakest points in the drillstring because of moving parts, which include complex shapes, resulting in stress concentration. The complete paper presents results of a study focusing on placing the jar in the bottomhole assembly (BHA) to reduce bending moments and bending stresses on the jar connections. As a result, the risk of twistoffs during drilling is minimized, while the effectiveness of the jar is maintained if a stuck event occurs.
Jars traditionally are placed between drill collars in the applications described in this study.
