Downhole tool
AssigneeRotech Holdings Limited
InventorHector Fillipus Alexander Van Drentham Susman
Life of this patent
Estimating the term…
Abstract
A downhole tool for generating a longitudinal mechanical load. In one embodiment, a downhole hammer is disclosed which is activated by applying a load on the hammer and supplying pressurizing fluid to the hammer. The hammer includes a shuttle valve and piston that are moveable between first and further position, seal faces of the shuttle valve and piston 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 releasing, the piston impacts a remainder of the tool to generate mechanical load. The mechanical load is cyclical by repeated movements of the shuttle valve and piston.
Claims62
A downhole tool for generating a mechanical load, the tool comprising:
- first and second members each moveable between at least a respective first and a respective further position in response to an applied fluid pressure;
- a sealing assembly for preventing fluid flow through the tool, the sealing assembly being released when the first and second members are moved to their respective further positions, so as to allow fluid flow through the tool;
- and
- a generally hollow housing defining an internal bore in which the first and second members are disposed for longitudinal movement therein, the housing defining a flow restriction comprising a nozzle;
- whereby, in use, when the sealing assembly is released the second member impacts a remainder of the tool to generate a mechanical load.
A downhole tool for generating a mechanical load, the tool comprising:
- first and second members each moveable between at least a respective first and a respective further position in response to an applied fluid pressure;
- a sealing assembly for preventing fluid flow through the tool, the sealing assembly being released when the first and second members are moved to their respective further positions, so as to allow fluid flow through the tool;
- a generally hollow housing defining an internal bore in which the first and second members are disposed for longitudinal movement therein, the housing defining a flow restriction;
- and
- a key assembly for restraining the second member against rotation with respect to a housing of the tool,
- whereby, in use, when the sealing assembly is released the second member impacts a remainder of the tool to generate a mechanical load.
A downhole tool for generating a mechanical load, the tool comprising:
- a generally hollow housing defining an internal bore and a flow restriction comprising a nozzle;
- first and second members each disposed at least partly in the housing for longitudinal movement with respect to the housing between respective first and second positions in response to an applied fluid pressure;
- sealing means for sealing between the first and second members during movement of the members from the respective first to the respective second positions;
- and
- restraint means for restraining movement of the first member relative to the second member so as to cause the sealing means to release, to allow fluid flow between the first and second members;
- whereby fluid flow between the first and second members allows the second member to return to the first position, to impact the first member and generate the mechanical load.
A downhole tool for generating a mechanical load, the tool comprising:
- a generally hollow housing defining an internal bore and a flow restriction comprising a nozzle;
- first and second members each disposed at least partly in the housing for longitudinal movement with respect to the housing between respective first and second positions in response to an applied fluid pressure;
- and
- a sealing assembly adapted to seal the tool to prevent fluid flow through the tool when the first and second members are in their respective first positions and to allow fluid flow through the tool when the first and second members are in their respective second positions;
- whereby fluid flow through the tool allows the second member to return to the first position to impact a remainder of the tool and generate the mechanical load.
A drilling assembly comprising a drilling motor and a downhole tool for generating a mechanical load, the tool comprising:
- first and second members each moveable between at least a respective first and a respective further position in response to an applied fluid pressure;
- a sealing assembly for preventing fluid flow through the tool, the sealing assembly being released when the first and second members are moved to their respective further positions, so as to allow fluid flow through the tool;
- and
- a generally hollow housing defining an internal bore in which the first and second members are disposed for longitudinal movement therein, the housing defining a flow restriction;
- whereby, in use, when the sealing assembly is released the second member impacts a remainder of the tool to generate a mechanical load.
A downhole hammer comprising:
- a first member;
- a second member;
- a generally hollow housing defining an internal bore in which the first and second members are disposed for longitudinal movement therein and a flow restriction comprising a nozzle;
- and sealing means between said first and second members, wherein, in use, application of fluid pressure to the hammer causes the first and second members to move from respective first to respective second positions and during such movement the sealing means sealing between the first and second members substantially prevents fluid flow therebetween;
- and
- wherein further, in use, further application of fluid pressure causes the sealing means to release, to allow the second member to return to the first position whereby the second member is impacted by a remainder of the hammer.
Dependencies are inferred from the claim text.