Pumpdown valve plug assembly for liner cementing system
US6311775A · kind A · utility
52Cited by
7References
3Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 3, 2000 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Apr 3, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2025/1086
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Method and apparatus are disclosed for use in cementing a tubular member which is run into a borehole using a drill string. A landing collar is attached to the tubular member near the bottom of the tubular member, and the landing collar has an opening at least five inches in diameter. A liner wiper assembly is releasably suspended from the drill string. The liner wiper assembly comprises a lower liner wiper plug comprising float valves and an upper liner wiper plug. With the method and apparatus of the present invention, plugging problems are minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.