Extendable downhole tool and related systems, apparatus, and methods
AssigneeBaker Hughes Oilfield Operations LLC
InventorsShiva Paramhans, David Hejl
Life of this patent
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Abstract
An extendable downhole tool including a first extendable probe, a second extendable probe and a pressure system configured to apply pressure to the first extendable probe and the second extendable probe. The pressure system also include an extension valve configured to pass fluid pressure to an inner surface of a first piston and a second piston and a retracting valve configured to pass the fluid pressure to an outer surface of the first piston and the second piston. An area ratio of the first piston may be greater than an area ratio of the second piston. The extendable downhole tool may also include a screen and a screen scraper associated with one or more of the first extendable probe and the second extendable probe.
Claims20
An extendable downhole tool comprising:
- a first extendable probe and a second extendable probe;
- a pressure system configured to apply a force to the first extendable probe and the second extendable probe, the pressure system comprising:
- a first piston coupled to the first extendable probe;
- a second piston coupled to the second extendable probe;
- an extension valve configured to pass fluid pressure to an inner surface of the first piston and the second piston;
- and
- a retracting valve configured to pass the fluid pressure to an outer surface of the first piston and the second piston;
- and
- wherein an area ratio of the first piston defined by an area of the outer surface of the first piston over an area of the inner surface of the first piston is greater than an area ratio of the second piston defined by an area of the outer surface of the second piston over an area of the inner surface of the second piston.
A downhole sampling tool comprising:
- at least two extendable probes extending in opposing radial directions from the downhole sampling tool, each of the at least two extendable probes comprising a port and a screen, the screen positioned within the port and configured to filter a fluid before the fluid enters the port;
- wherein the at least two extendable probes are configured to extend from and retract over a stationary portion of the downhole sampling tool;
- and
- a scraping element coupled to the stationary portion of the downhole sampling tool, the scraping element configured to scrape a surface of the screen when the at least two extendable probes retract into the stationary portion of the downhole sampling tool.
A method of biasing an extendable downhole tool comprising at least two extendable probes, the method comprising:
- biasing the extendable downhole tool toward a first extendable probe of the at least two extendable probes by:
- applying a pressure to an inside surface of at least two pistons coupled to the at least two extendable probes,
- wherein an area of the inside surface of a first piston of the at least two pistons is greater than an area of the inside surface of a second piston of the at least two pistons, and wherein the first piston is coupled to the first extendable probe and the second piston is coupled to a second extendable probe;
- and
- biasing the extendable downhole tool toward the second extendable probe of the at least two extendable probes by:
- applying the pressure to both the inside surface of the at least two pistons and an outer surface of the at least two pistons,
- wherein an area ratio of the first piston defined by an area of the outer surface of the first piston over an area of the inside surface of the first piston is greater than an area ratio of the second piston defined by an area of the outer surface of the second piston over an area of the inside surface of the second piston.
Dependencies are inferred from the claim text.