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US 2013/0256031 A1Published application
Down hole tool with adjustable fluid viscosity
AssigneeSmith International, Inc.
InventorArley G. Lee
Life of this patent
Estimating the term…
Abstract
A down hole tool includes a tool body, a fluid cavity, a magnetorheological fluid disposed in the fluid cavity, and an electrical control unit in communication with the MR fluid. The electrical control unit is configured to adjust a viscosity of the MR fluid by varying a magnetic field.
Claims21
-17. (canceled)
A method of operating a jar during a wellbore operation, the method comprising:
- tensioning a drill string to cause a flow of a magnetorheological (MR) fluid between one or more operative pairs of fluid cavities;
- controlling the flow of the MR fluid between the fluid cavities by varying a magnetic field to adjust a viscosity of the MR fluid;
- and
- releasing tension in the drill string.
1 more element
A method of operating an underreamer having one or more expandable arms, the method comprising:
- expanding the one or more expandable arms by flowing a magnetorheological (MR) fluid between one or more operative pairs of fluid cavities;
- and
- controlling the flow of the MR fluid between the fluid cavities by varying a magnetic field to adjust a viscosity of the MR fluid.
A downhole tool, comprising:
- a tool body;
- one or more operative pairs of fluid cavities;
- a magnetorheological (MR) fluid disposed in one of the respective fluid cavities;
- a sensor for taking a measurement of the MR fluid;
- an electrical control unit for varying a magnetic field to adjust a viscosity of the MR fluid in the respective fluid cavities based on the measurement.
2 more elements
Dependencies are inferred from the claim text.