Combined crushing super-variable-diameter drill bit for natural gas hydrate exploitation
US11199050B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 31, 2020 |
| Grant date | Dec 14, 2021 |
| Priority date | — |
| Expiry date | Oct 31, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B41/0099
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention relates to a combined crushing super-variable-diameter drill bit for natural gas hydrate exploitation, including a joint, an outer cylinder connected to the joint by thread, a nozzle I mounted in the outer cylinder, a mechanical locking mechanism, a blade telescoping mechanism, an end cap connected to the outer cylinder by thread, a seal ring IV mounted to the end cap, and a nozzle II mounted in the end cap by threaded connection. The present invention achieves integrated operation of conventional drilling and draw-back expanding, which can effectively solve the problems that the existing hydrate drill bit cannot drill a large borehole, cannot mechanically lock an extending position of the blade to stabilize the size of the borehole, and a single crushing method is inefficient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.