| 摘要 |
A perforating tool 2 usable in a well casing to perforate the well casing is described. Perforating tool 2 comprises an activation member 4 disposed in body 6 wherein the activation member is moveable relative to the body 6 to move at least one working member 8 between and inwardly retracted condition an outwardly deployed condition relative to the body 6. A plurality of pistons 10 is arranged to move the activation member 4 relative to the body 6, each said piston 10 being disposed in a respective pressure chamber 12 arranged to be filled with fluid in response to an increase in fluid pressure in the body 6. |
