Reverse circulator and method
US12264557B2 · kind B2 · utility
0Cited by
4References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2022 |
| Grant date | Apr 1, 2025 |
| Priority date | — |
| Expiry date | Mar 9, 2043 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Gravity driven reverse circulator tools are provided and methods of using same. One tool has nested pipes that when fully nested close a hole in one of the pipes, but when the drillstring is lifted, the pipes partially separate under the force of gravity to expose the hole. The other embodiment is similar, but the hole is hook shaped (hook on top as in a walking cane) and a protrusion from the other pipe fits in the hole. Thus, both lifting and rotation are needed open the tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.