HYDRAULIC FLOW RESTRICTION TUBE TIME DELAY SYSTEM AND METHOD

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(11)

EP 3 081 739 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	09.11.2016 Bulletin 2016/45

(43)	Date of publication A2:
	19.10.2016 Bulletin 2016/42

(21)	Application number: 16164638.5

(22)	Date of filing: 11.04.2016

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International Patent Classification (IPC):

E21B 34/10^(2006.01)
E21B 34/06^(2006.01)
F15B 21/10^(2006.01)

E21B 21/10^(2006.01)
E21B 47/10^(2012.01)

(84)	Designated Contracting States:
	AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
	Designated Extension States:
	BA ME
	Designated Validation States:
	MA MD

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Priority:

13.04.2015 US 201514685176
04.02.2016 US 201615016009

(71)	Applicant: GEODynamics, Inc.
	Millsap, TX 76066 (US)

(72)	Inventor:
	Hardesty, John T. Millsap, TX Texas 76066 (US)

(74)	Representative: Gosnall, Toby
	Barker Brettell LLP 100 Hagley Road Edgbaston Birmingham B16 8QQ Edgbaston Birmingham B16 8QQ (GB)

(54)	HYDRAULIC FLOW RESTRICTION TUBE TIME DELAY SYSTEM AND METHOD

(57) A hydraulic time delay system and method in a wellbore tool is disclosed. The system/method includes an actuation mechanism which allows pressure to act on a functional piston (0201) in the wellbore tool. The movement of the piston is restrained by a partially or filled reservoir (0202) which is allowed to exhaust through a flow restriction element (0203). The restriction element comprises standard metal tubing with a known inner diameter and is cut to an exact length as predicted by fluid dynamic modeling. A time delay and rate of piston movement desired for the downhole tool, between a trigger event such as pressure and a functional event, can be tuned with parameters that include the length and diameter of the tubing, reservoir fluid viscosity, porous material with permeability in the tube, and number of tubes in parallel.

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