Downhole tool and method for perforating and sampling

(19)

(11)

EP 0 295 922 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	13.12.1989 Bulletin 1989/50

(43)	Date of publication A2:
	21.12.1988 Bulletin 1988/51

(21)	Application number: 88305522.0

(22)	Date of filing: 17.06.1988

(51)	International Patent Classification (IPC)⁴: E21B 49/08, E21B 43/116, E21B 34/10, E21B 47/06

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

(30)

Priority:

19.06.1987 US 64285

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

(72)	Inventor:
	Christensen, Jon Brent Ankeny Iowa 57721 (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)

(56)

References cited: :


	Remarks:
	The title of the invention has been amended (Guidelines for Examination in the EPO, A-III, 7.3).

(54)	Downhole tool and method for perforating and sampling

(57) A downhole tool for perforating a well and obtaining fluid samples therefrom, comprises a retrievable packer (20), perforating guns (24) and a sampler (22) disposed between the packer and guns which is adapted for entrapping a fluid sample without flowing well fluids into the tool string. An operating piston is slidably disposed in a cylinder above the packer and is used to actuate a sampler valve in the sampler. A seal ensures that all portions of a sampling chamber in the sampler are disposed below the packer. The operating piston is actuated in response to a pressure differential between a well annulus above the packer and an internal pressure in the tool. The sampler includes a plurality of sampler modules disposed in the sampling chamber. Each of the sampler modules includes a valve which automatically closes after a predetermined volume of fluid fills a sampler module chamber defined in the sampler module.

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