| 摘要 |
<p>It is provided a tool and its operating procedure, to protect any device while loweringinto a well, and especially hydraulic devices such as sensors with expandable armsor inflatable elements such as packers. The protection is mainly important inthe open hole of highly deviated or horizontal wells, for any device equipped withexternal seal element, delicate sensor or articulated parts. This tool featuresan automatic sequence controlled by a single dart or a single ball launched intothe running string from the surface: when the dart or the ball lands on its seat,the pressure build-up is initially applied to a piston to extract the device fromthe protector without exposing it to any differential pressure, then it is automaticallyapplied to the device itself for actuation as soon as the device is entirely pulledout of the protector.</p> |
