Heat activated safety fuse

Details Heat activated safety fuse Heat activated safety fuse

E - Fixed Constructions

21

B

E21B 23/06 (2006.01) E21B 43/1185 (2006.01) F42D 1/04 (2006.01)

Patent

CA 2156483

A method and an apparatus for use in a wellbore ate provided to prevent an electrical current from passing between a power supply (100) and an electrically operated downhole well tool (2) until after the electrically operated downhole well tool is positioned downhole within the wellbore. A temperature sensitive member (135) prevents a biased member from moving from a first position to a second position until after the temperature sensitive member has been heated to an activation temperature, at which the temperature sensitive member softens to allow the biased member to move through the temperature sensitive member and to the second position for electrically connecting between the power supply and die electrically operated downhole well tool.

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