Drilling with casing
US6705413B1 · kind B1 · utility
54Cited by
25References
35Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1999 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Jun 22, 2019 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/208
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and apparatus for drilling directional wellbores using a casing string as a drill stem is taught. A retrievable bit is mounted at an end of the casing string and either a mud motor with a bent housing and/or bent sub or a rotary steerable tool is used to direct the bit to drill directionally.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.