E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/15
E21B 43/116 (2006.01)
Patent
CA 1276544
ABSTRACT OF THE DISCLOSURE This invention provides a tool for perforating the wall of a tube located within a well bore in accordance with the present invention including a tool body adapted to be positioned within the tubing to be perforated. The body includes a first chamber adapted to retain an explosive charge. A first piston is slidably disposed in the tool body with one face of the piston communicating with the above-noted chamber such that the first piston moves in response to pressures developed by detonation of the explosive charge. The tool body includes a second chamber for hydraulic fluid and the other face of the first piston communicates with this second chamber such that movement of the first piston displaces hydraulic fluid from the second chamber. A second piston is slidably disposed in the tool body and is arranged to move in response to the displacement of hydraulic fluid from the second chamber in a direction outwardly of the tool body and toward the wall of the tubing within which, in use, the tool body is located. A punching device is carried by the second piston for perforating the wall of the tubing as the second piston moves outwardly following detonation of the explosive charge.
510295
Gowling Lafleur Henderson Llp
Szaniszlo John
LandOfFree
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