| 摘要 |
A method of disconnecting from a bottom hole assembly within a wellbore using a disconnect tool (100, figure 2) which comprises a tubular bottom housing 102 that has an internal torque transmission portion (114, figure 4A) and an internal locking portion (116, figure 4A); a tubular top housing 104 that has an external locking portion 136 and an external torque transmission portion 134; a tubular release piston 106 adapted to translate longitudinally within the top housing from a locked position to an unlocked position; a valve seat 162; and a shear sleeve 108 which is adapted to secure the piston 106 in a locked position and to disconnect from the piston 106 at a threshold force to allow the piston 106 to translate to an unlocked position. The sleeve 108 may include shear pins 170. A valve member (202, figure 6A) engages the valve seat 162 of the release piston 106 to exert a force which unlocks the piston 106 and a force is then exerted on the top housing 104 in an uphole direction to begin separation of the top housing 104 from the bottom housing 102. |
