Hydraulic flow restriction tube time delay system and method
US9273535B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2015 |
| Grant date | Mar 1, 2016 |
| Priority date | — |
| Expiry date | Apr 13, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/108
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
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 in the wellbore tool. The movement of the piston is restrained by a partially or filled reservoir which is allowed to exhaust through a flow restriction element. 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 and number of tubes in parallel. In another embodiment, a secondary plugging element added to the reservoir controls the rate of piston movement and time delay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.