EP0909008A2
Expired / Lapsed
EP
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Downhole current generator
Assignee: Halliburton Energy Services Inc
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Filing: 1998-09-15
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Granted: —
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Expires: 2018-09-15
Abstract
Abstract A downhole current generator (34) generates power in a wellbore and includes a power section (36) and a generator section (38). The power section (36) has a sleeve (44) slidably disposed within a housing (42) which oscillates in response to the application of fluid pressure to the current generator (34). A piston (48) is slidably attached to the sleeve (44) and oscillates relative to the sleeve (44) and the housing (42). The piston (87) extends longitudinally into the generator section (38) and has a plurality of magnets (78) attached thereto which oscillate with the piston (48). Wire coil sections (82) are fixed relative to the housing of the generator section (38) and are positioned between the oscillating magnets (78) such that a current is induced in the wire coil sections (82) upon oscillation of the magnets (78)
Inventors
- 👤 Neal G. Skinner
- 👤 Paul D. Ringgenberg
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 08:31
CPC Classifications
H; H02; H02K; H02K35/00; H02K35/02; E; E21; E21B; E21B41/00; E21B41/0085; H02K7/00; H02K7/18; H02K7/1869; H02K7/1876
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
27 words
A downhole current generator (34), comprising: a power section (36); and a
generator section (38) which generates a current responsive to oscillations of the
power section (36).
Claim 2
Dependent Claim
74 words
A downhole current generator (34) according to claim 1, wherein said generator
section (38) includes: at least one magnet (78) which oscillates in response to the
oscillation of said power section (36); and at least one wire coil section (82) positioned
in relation to the or each magnet (78) such that a current is induced within said at least
one wire coil section (82) in response to oscillations of the or each magnet (78).
Claim 3
Dependent Claim
47 words
A downhole current generator (34) according to claim 2, wherein said power
section (36) includes a piston (48) which oscillates in response to an application of
increased fluid pressure to said power section (36) and wherein the or each magnet
(78) is attached to said piston (48).
Claim 4
Dependent Claim
27 words
A downhole current generator (34) according to claim 2 or 3, wherein the or each
magnet (78) overlaps the or each wire coil section (82) during oscillation.
Claim 5
Dependent Claim
19 words
A downhole current generator according to claim 2, 3 or 4, wherein there are at
least two magnets (78).
Claim 6
Dependent Claim
157 words
A downhole current generator (34) for generating current in a wellbore,
comprising: a power section (36), including a first housing (42), a sleeve (44) slidably
disposed within said first housing (42) such that said sleeve (44) oscillates axially within
said first housing (42) in response to changes in fluid pressure across the power
section (36), and a piston (48) slidably disposed within said sleeve (44) to oscillate
axially relative said sleeve (44) and said first housing (42); and a generator section
(38), including a second housing attached to said power section (36) and defining an
interior volume into which said piston (48) of said power section (36) extends, at least
two magnets (78) attached to said piston (48) such that said magnets (78) oscillate in
response to the oscillation of said piston (48), and a wire coil section (82) fixed relative
to said second housing of said generator section (38) and positioned to overlap said
magnets (78).
Claim 7
Dependent Claim
40 words
A downhole current generator (34) according to claim 6, wherein said generator
section (38) further includes alternating finger pieces (84) extending longitudinally
along said second housing of said generator section (38) and further defining grooves
between the finger pieces (84).
Claim 8
Dependent Claim
31 words
A downhole current generator (34) according to claim 7, wherein said magnets
(78) are attached to said piston (420 to oscillate within said grooves defined by said
alternating finger pieces (84).
Claim 9
Dependent Claim
51 words
A downhole current generator (34) according to claim 7 or 8, wherein a bobbin
(86) is attached to said finger pieces (84) and a wire coil (82) is wrapped around said
bobbin (86) such that said magnets (78) generate a magnetic field perpendicular to the
circumference of said wire coil (82).
Claim 10
Independent Claim
70 words
A method of generating power in a wellbore, comprising: oscillating a piston (48)
in a downhole current generator (34) responsive to a differential in fluid pressure
across the downhole current applied to said downhole current generator (34); and
relatively oscillating at least one magnet (78) relative to a wire coil section (82)
responsive to the oscillation of said piston (48) to induce a current in said wire coil
section (82).
Claim 11
Dependent Claim
46 words
A method according to claim 10, further including the steps of: inserting the
downhole current generator (34) into a wellbore, wherein the downhole current
generator (34) includes a power section (36) and a generator section (38); and applying
fluid pressure to the downhole current generator (34).
Claim 12
Dependent Claim
69 words
A method according to claim 11, wherein said step of oscillating the piston (48)
further includes the steps of: oscillating a sleeve (44) which is slidably disposed within
a housing (42) of the power section of said downhole current generator (34) responsive
to the change in fluid pressure; and oscillating said piston (48) relative to said sleeve
(44) and said housing (42) responsive to the change in fluid pressure.
References Cited (Backward Citations)
No citation records indexed.
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