| 摘要 |
<p>PURPOSE: To prevent the separation of a motor housing and a drill bit. CONSTITUTION: The down-hole motor is rotated by drilling fluid pumped from the surface, through a passage formed within the drill string 10, and into the down-hole motor. A valve 36 is positioned in the passage in the drill string and has a first operating position adapted for passing the drilling fluid to the down-hole motor, and a second operating position adapted to substantially blocking the drilling fluid from being delivered through the down-hole motor. The valve is of a two piece construction, having a first body 44 connected to an upper tubular section 14 and a second body 46 connected to the down-hole motor. Longitudinal movement between the upper tubular section 14 and the down-hole motor is a result of rotation of the lower tubular section by the motor. Corresponding longitudinal movement of the first and second bodies between the first and second operating position is generated by the longitudinal movement.</p> |
