Buoyancy assist tool with floating piston
US11105166B2 · kind B2 · utility
4Cited by
29References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2019 |
| Grant date | Aug 31, 2021 |
| Priority date | — |
| Expiry date | Aug 27, 2039 |
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 fluid barrier connected in the casing string. A degradable plug is positioned in the casing string above the fluid barrier. The degradable plug and fluid barrier define upper and lower ends of a buoyancy chamber in the casing string. The degradable plug may be degraded to leave an open bore through the casing string after the casing string is lowered into a wellbore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.