Buoyancy assist tool with waffle debris barrier
US11230905B2 · kind B2 · utility
3Cited by
31References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 3, 2019 |
| Grant date | Jan 25, 2022 |
| Priority date | — |
| Expiry date | Mar 19, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/08
- 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 define a buoyancy chamber therebetween. A debris barrier positioned above the removable plug has a plurality of fragments interspersed in a stretchable material and includes a frangible disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.