Patent ID: 9650866
Date: 2017-05-16
CPC Classifications: E21B

Claim:
1. A controlled time delay apparatus integrated into a wellbore casing for injection of pressurized fluid into a subterranean formation, said apparatus comprising: a housing with openings, a piston, a delay restrictor, an actuating device and a high pressure chamber with a hydraulic fluid; said delay restrictor is configured to be in pressure communication with said high pressure chamber; a rate of travel of said piston is restrained by a passage of said hydraulic fluid from the high pressure chamber into a low pressure chamber through said delay restrictor; wherein upon actuation by said actuating device, said piston travels for an actuation time period, after elapse of said actuation time period, said piston travel allows opening of said openings so that said pressurized fluid flows through said openings for a port opening time interval.