Buoyancy assist tool with annular cavity and piston
US11142994B2 · kind B2 · utility
3Cited by
29References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 19, 2020 |
| Grant date | Oct 12, 2021 |
| Priority date | — |
| Expiry date | Feb 19, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/134
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A downhole apparatus comprises a casing string with a removable plug therein to block flow therethrough. A flow barrier is positioned in the casing below the removable plug and the removable plug and the flow barrier defining a buoyancy chamber therebetween. A debris barrier positioned above the removable plug comprises a rigid annular ring with a flexible diaphragm covering the center opening defined by the annular ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.