Wellbore drilling technique using eccentric tool joints to mitigate pressure-differential sticking
US4246975A · kind A · utility
5Cited by
7References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 4, 1979 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | Apr 4, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rotary method and apparatus are described to mitigate differential sticking of a drill string during the drilling of a wellbore. Eccentrically bored tool joints are used for interconnecting joints of drill pipe together into a drill string for use in drilling the wellbore. The drill string is rotated in the wellbore, causing the drill pipe to be eccentrically moved in the wellbore during the drilling operation to better remove the cuttings from the wellbore and mitigate differential sticking of the drill string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.