Patent ID: 9234405
Filing Date: 2016-01-12
CPC Classification: E21B,Y10T

Claim Text:
1. Device for a fluid operated valve body for activation of a fluid operated tool, said valve body can be connected to a pipe section of a pipe arranged in a well in a formation characterised in that said valve body comprises a release body having one end exposed to a fluid pressure in the pipe and an opposite end disposed in a chamber in the pipe section in open fluid connection with the well outside the pipe section, said release body being a piston which is placed in a boring through a wall of said valve body; a pre-stressing body in said chamber biasing said release body towards said one end against the fluid pressure in the pipe to balance said release body hydraulically whereby said release body is movable in number of stepwise forward and backward movements by increasing and decreasing, respectively, the fluid pressure in the pipe; a slide body movable in response to movements of said release body; and characterised in that said piston comprises a rotary blocking hook for engaging with said slide body during the movement of said piston upwards for each increase in the fluid pressure in the pipe.