| 摘要 |
<p>A device is described for a fluid operated valve body 200 for activation of a fluid operated tool, said valve body 200 is connected to a pipe section 1 1 of a pipe 160 arranged in a well 120 in a formation 140, and the device is characterised in that the valve comprises a plunger piston 5 in a channel 232, which plunger piston 5 is reset from a closed to an open position to let fluid into the tool, said resetting takes place with a piston 210, said piston 210 is brought to a number of stepwise forwards and backwards movements by increasing and decreasing, respectively, the fluid pressure P2, and said movements affect a slide body 14 which is moved stepwise, in one direction, to a position where it opens for balls 8 to fall out of channel 232, thereby releasing the plunger piston 5 to move and open for fluid flow P to the fluid operated tool. The piston 210 is an extended body the one end of which is exposed to the pipe fluid, while the other end 212 is held pre-stressed by a pre-stressing body 15, where the slide movement takes place when the piston 210 moves as a consequence of said pressure release, and the pre-stressing body 15 is arranged in a chamber that is in open fluid connection with the well outside the pipe section, and the piston 210 is hydraulically balanced. The piston 210 affects the slide body 4 by teeth 239 on the slide body 4 and lifting arm 10 on the piston 210. A method for operation of the valve body is also described.</p> |
