| 摘要 |
A downhole drill system including a primary drive shaft with a drill head coupled to a distal end of the primary drive and a drill head de-coupling assembly disposed therebetween. The drill head de-coupling assembly includes a ring shaped spacer assembly, positioned between the primary drive shaft and the drill head so as to maintain a gap therebetween subsequent to tightened coupling between the primary drive shaft and the drill head, and subsequent to extend use of the drill head, and a retention assembly structured to maintain the spacer assembly between the primary drive shaft and the drill head until affirmatively released thereby so as to permit removal of the spacer assembly from between the primary drive shaft and the drill head, leaving only the gap between the primary drive shaft and the drill head, and thereby facilitating removal of the drill head from the primary drive shaft subsequent to the extended use of the drill head.
|
