Thermomechanical electrical power supply apparatus for a downhole tool

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(11)

EP 0 238 337 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	08.03.1989 Bulletin 1989/10

(43)	Date of publication A2:
	23.09.1987 Bulletin 1987/39

(21)	Application number: 87302375.8

(22)	Date of filing: 19.03.1987

(51)	International Patent Classification (IPC)⁴: E21B 41/00, F02G 1/043 // E21B47/06, E21B43/116

(84)	Designated Contracting States:
	DE ES FR GB IT NL

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Priority:

20.03.1986 US 841924

(71)	Applicant: HALLIBURTON COMPANY
	Duncan Oklahoma 73536 (US)

(72)	Inventor:
	Buchanan, Ronnie Joe Duncan Oklahoma 73533 (US)

(74)	Representative: Wain, Christopher Paul et al
	A.A. THORNTON & CO. Northumberland House 303-306 High Holborn London WC1V 7LE London WC1V 7LE (GB)

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References cited: :

(54)	Thermomechanical electrical power supply apparatus for a downhole tool

(57) 0 A downhole tool for an oil or gas well includes a self-contained power supply having a housing (6) in which a primary fuel source (18), a Stirling cycle engine (20), and a linear alternator (22) are disposed. The primary fuel source includes a radioisotope which, by its radioactive decay, provides heat to operate the Stirling engine which in turn drives the linear alternator to provide a suitable electrical output for us by the circuit of the downhole tool.

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