Pressure actuated ported sub for subterranean cement completions
USRE46137E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Oct 13, 2015 |
| Grant date | Sep 6, 2016 |
| Priority date | — |
| Expiry date | Oct 13, 2035 |
Classification
- Technology area (CPC —)General
Abstract
A tubing pressure operated sliding sleeve is used in cementing a tubular string. The sleeve is configured to hold closed as pressure builds to a predetermined value. When pressure is further raised a rupture disc blows and provides access to an integral piston disposed outside the sleeve. The back side of the piston is exposed to a low pressure or atmospheric chamber located between upper and lower seals. The sleeve thickness near the chamber can be made relatively thick to avoid flexing or bending under differential pressure because the net force to shift the sleeve is from differential pressure on the piston rather than the piston areas created by the upper and lower seals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.