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1. (WO2018223048) ELECTRONIC TIME DELAY APPARATUS AND METHOD

Pub. No.:    WO/2018/223048    International Application No.:    PCT/US2018/035679
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Sat Jun 02 01:59:59 CEST 2018
IPC: E21B 43/1185
F42D 1/05
F41A 19/58
Applicants: GEODYNAMICS, INC.
Inventors: HARDESTY, John, T.
ROESSLER, Dennis, E.
CHURCH, Paul, Andrew
MACLEOD, Iain, Morrison
ELRICK, Andrew, John
JOINER, Peter, Alan
Title: ELECTRONIC TIME DELAY APPARATUS AND METHOD
Abstract:
A time delay apparatus for use with a downhole tool in a wellbore casing. In an exemplary embodiment, the apparatus includes an electronic circuit comprising a timer, a fusible link, a split spool device that includes a center pin held in place in a restrained position with a spool and a spring element surrounding the spool, A pressure applied to a trigger device, such as a rupture disk, activates a pressure switch and starts a timer, configured with a preset countdown time, in the electronic circuit. On expiration of the timer, the timer block of the electronic circuit generates a signal to cause breaking of the fusible link and releasing of the spring element such that the center pin of the split spool travels to a functional position and activates the downhole tool.