E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 4/14 (2006.01) E21B 6/06 (2006.01) E21B 31/113 (2006.01)
Patent
CA 2449506
There is disclosed a downhole tool for generating a longitudinal mechanical load. In one embodiment, a downhole hammer (10) is disclosed which is activated by applying a load on the hammer and supplying pressurised fluid to the hammer. The hammer includes a shuttle valve (14) and a piston (16) that are moveable between first and further positions, seal faces (18, 20) of the shuttle valve (14) and piston (16) being released when the valve and the piston are in their respective further positions, to allow fluid flow through the tool. When the seal is released, the piston (16) impacts a remainder of the tool to generate a mechanical load. The mechanical load is cyclical by repeated movements of the shuttle valve (14) and piston (16).
La présente invention concerne un outil de fond pour générer une charge mécanique longitudinale. Selon un mode de réalisation, un outil de fond (10) est activé en appliquant une charge sur le marteau et en fournissant un fluide sous pression au marteau. Ce marteau comprend un clapet double (14) et un piston (16) qui peuvent se déplacer entre une première position et d'autres positions, des faces d'étanchéité (18, 20) de ce clapet (14) et le piston (16) étant relâchés lorsque le clapet et le piston se trouvent dans leurs positions correspondantes pour permettre au fluide de s'écouler dans l'outil. Lors du relâchement de la fermeture étanche, le piston (16) vient frapper le reste de l'outil pour générer une force mécanique cyclique du fait des déplacements répétés du clapet (14) et du piston (16).
Rotech Holdings Limited
Sim & Mcburney
LandOfFree
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