Double-walled drill pipe and drilling machine
US11268328B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2019 |
| Grant date | Mar 8, 2022 |
| Priority date | — |
| Expiry date | Jul 25, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/002
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A double-walled drill pipe includes an outer drill pipe, an inner drill pipe and a drill pipe sealing apparatus. The outer drill pipe includes an axial through hole and a wall surface through hole, and the wall surface through hole is disposed in a wall surface of the outer drill pipe to connect the outside of the double-walled drill pipe and the axial through hole. The inner drill pipe is rotatably disposed in the axial through hole, and includes a fluid guiding hole connected to the wall surface through hole. The drill pipe sealing apparatus is disposed between the outer drill pipe and the inner drill pipe. The drill pipe sealing apparatus is axially located between a driving end and a connecting port of the wall surface through hole connected to the axial through hole. A drilling machine including the double-walled drill pipe is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.