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US 2019/0136653 A1Published application
Milling Bypass Valve
AssigneeBaker Hughes, A Ge Company, LLC
InventorsGregory L. Hern, William A. Hered, Darin H. Duphorne
Life of this patent
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Abstract
A method and apparatus for controlling fluid flow through a drill string includes a housing having an axis, a radial wall with a bore extending axially therethrough, and an aperture formed in the radial wall. The aperture is in fluid communication with the bore. A piston is located inside the housing and has an orifice configured to permit axial fluid flow through the housing. The spring axially biases the piston to a closed position.
Claims23
A flow control apparatus to a borehole tool supported on a tubular string, comprising:
- a housing further comprising an inlet, a straight through outlet and at least one lateral wall port;
- a piston in said housing selectively covering said wall port, said piston comprising a straight through passage from a top end thereof in flow communication with said straight through outlet and a discrete lateral passage beginning adjacent said top end to a circulation outlet and extending to an outer periphery of said piston, said circulation outlet movable into aligned or misaligned positions with respect to said at least one lateral wall port responsive to flow generated force opposing a bias force on said piston.
A flow control method for a borehole tool, comprising:
- providing a housing further comprising an inlet, a straight through outlet and at least one lateral wall port with end connections for attaching to a tubular string to position a borehole tool in a borehole;
- additively manufacturing a piston in said housing selectively covering said wall port, said piston comprising a straight through passage from a top end thereof in flow communication with said straight through outlet and a discrete lateral passage beginning adjacent said top end to a circulation outlet and extending to an outer periphery of said piston, said circulation outlet movable into aligned or misaligned positions with respect to said at least one lateral wall port responsive to flow generated force in said straight through passage opposing a bias force on said piston;
- maintaining a predetermined flow to the borehole tool by circulating excess flow into said housing through said discrete lateral passage.
Dependencies are inferred from the claim text.