Method and apparatus for a downhole current generator
First Claim
1. A downhole current generator for generating current in a wellbore, comprising:
- a power section, including;
a first housing;
a sleeve slidably disposed within said first housing such that said sleeve oscillates axially within said first housing in response to changes in fluid pressure across the power section; and
a piston slidably disposed within said sleeve to oscillate axially relative said sleeve and said first housing;
an generator section, including;
a second housing attached to said power section and defining an interior volume into which said piston of said power section extends;
at least two magnets attached to said piston such that said at least two magnets oscillate in response to the oscillation of said piston; and
a wire coil section fixed relative to said second housing of said generator section and positioned to overlap said at least two magnets.
1 Assignment
0 Petitions
Accused Products
Abstract
A downhole current generator generates power in a wellbore and includes a power section and an generator section. The power section has a sleeve slidably disposed within a housing which oscillates in response to the application of fluid pressure to the current generator. A piston is slidably attached to the sleeve and oscillates relative to the sleeve and the housing. The piston extends longitudinally into an generator section and has a plurality of magnets attached thereto which oscillate with the piston. Wire coil sections are fixed relative to the housing of the generator section and are positioned between the oscillating magnets such that a current is induced in the wire coil sections upon oscillation of the magnets.
97 Citations
10 Claims
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1. A downhole current generator for generating current in a wellbore, comprising:
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a power section, including; a first housing; a sleeve slidably disposed within said first housing such that said sleeve oscillates axially within said first housing in response to changes in fluid pressure across the power section; and a piston slidably disposed within said sleeve to oscillate axially relative said sleeve and said first housing; an generator section, including; a second housing attached to said power section and defining an interior volume into which said piston of said power section extends; at least two magnets attached to said piston such that said at least two magnets oscillate in response to the oscillation of said piston; and a wire coil section fixed relative to said second housing of said generator section and positioned to overlap said at least two magnets. - View Dependent Claims (2, 3, 4, 5)
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6. A method of generating power in a wellbore, comprising:
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oscillating a piston in a downhole current generator responsive to a differential in fluid pressure across the downhole current applied to said downhole current generator, wherein said step comprises the steps of; oscillating a sleeve which is slidably disposed within a housing of the power section of said downhole current generator responsive to the change in fluid pressure; and oscillating said piston relative to said sleeve and said housing responsive to the change in fluid pressure; and relatively oscillating at least one magnet relative to a wire coil section responsive to the oscillation of said piston to induce a current in said wire coil section. - View Dependent Claims (7, 8)
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9. A downhole current generator for generating current in a wellbore, comprising:
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a power section, including; a first housing; a sleeve slidably disposed within said first housing such that said sleeve oscillates axially within said first housing responsive to changes in fluid pressure across the power section; and a piston slidably disposed within said sleeve to oscillate axially relative to said sleeve and said first housing; a generator section which generates a current responsive to oscillations of said piston in said power section. - View Dependent Claims (10)
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Specification