Downhole hydraulic pressure generator

(19)

(11)

EP 1 002 933 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	23.01.2002 Bulletin 2002/04

(43)	Date of publication A2:
	24.05.2000 Bulletin 2000/21

(21)	Application number: 99307942.5

(22)	Date of filing: 08.10.1999

(51)	International Patent Classification (IPC)⁷: E21B 23/00

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

02.11.1998 US 184793

(71)	Applicant: Halliburton Energy Services, Inc.
	Dallas, Texas 75381-9052 (US)

(72)	Inventor:
	Kilgore, Marion D. Dallas, Texas 75287 (US)

(74)	Representative: Wain, Christopher Paul et al
	A.A. Thornton & Co. 235 High Holborn London WC1V 7LE London WC1V 7LE (GB)

(54)	Downhole hydraulic pressure generator

(57) A hydraulic pressure generator (14) provides pressurized fluid for actuation of well tools. The hydraulic pressure generator (14) comprises: a housing assembly (22); first and second fluid chambers (44,50) in the housing assembly (22); a piston (54) separating the first and second chambers (44,50); and a barrier device (42) isolating the first chamber (44) from fluid pressure in the well external to the housing assembly (22). The barrier device (42) is selectively actuatable to permit fluid communication between the first chamber (44) and the well external to the housing assembly (22), and thereby apply fluid pressure in the second chamber (50) greater than fluid pressure in the first chamber (44) by a predetermined amount.

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