Estimating downhole RPM oscillations
US11624666B2 · kind B2 · utility
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75References
20Claims
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Key dates
| Filing date | Jun 3, 2019 |
| Grant date | Apr 11, 2023 |
| Priority date | — |
| Expiry date | Jul 23, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B44/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods and apparatus for including obtaining raw surface data for present values of torque (TTD) generated by a top drive operably coupled with a drillstring, obtaining raw surface data for present values of rotational speed (ω) of the top drive corresponding to the TTD, obtaining inertia (JTD) of the top drive, and estimating torque TST of the drillstring based on the obtained TTD data, the obtained data, and the obtained JTD data. The estimated drillstring torque TST may be utilized to determine a surface torque oscillation performance index (STOPI).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.