Method and apparatus for transitioning between rotary drilling and slide drilling while maintaining a bit of a bottom hole assembly on a wellbore bottom
US11559149B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2020 |
| Grant date | Jan 24, 2023 |
| Priority date | — |
| Expiry date | Jun 26, 2041 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/024
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A method of transitioning from rotary to slide drilling while maintaining a bit of a bottom hole assembly (“BHA”) on a wellbore bottom includes (a) recording a first toolface value of the BHA that is coupled to a drill string; (b) identifying a correlation between the first toolface value and a first quill position of a quill coupled to the drill string; (c) identifying a breakover torque for the drill string; (d) performing rotary drilling; (e) recording a second toolface value while the bit remains on the wellbore bottom; (f) receiving, while the bit remains on the wellbore bottom, a target toolface value; (g) calculating, while the bit remains on the wellbore bottom, an unwind amount to unwind the drill string; and (h) unwinding the drill string by the unwind amount to bring the second toolface value closer to the target toolface value while the bit remains on the bottom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.