| 摘要 |
<p>A communication nipple for communicating control fluid flow from the outside of a well tool to the inside of a well tool through a fluid passage in the well tool without the use of elastomer seals. A metal breakable screw extends vertically into and initially blocks the passageway with a metal-to-metal seal and extends to the inside of the well tool. The screw includes a cavity exposed to the passageway. A vertically-moving breaking sleeve is connected to the screw and is adapted to break the screw in tension and expose the cavity to the interior of the well tool when the sleeve is moved away from the screw. The present apparatus is particularly useful for supplying hydraulic control fluid into the valve bore of a first well safety valve for controlling a second safety valve positioned in the first valve bore.</p> |
