Method for drilling with casing
US7044241B2 · kind B2 · utility
64Cited by
13References
41Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 14, 2001 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | May 14, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for drilling boreholes using casing (16) as the drill string and for advancing a casing string toward the bottom of the borehole is described. In the method, the drilling assembly (26) is used as a guide over which the drill string (16) is advanced toward the bottom of the borehole prior to removing the drilling assembly from the wellbore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.