Systems and methods for estimating drill bit rotational velocity using top drive torque and rotational velocity
US11098573B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2018 |
| Grant date | Aug 24, 2021 |
| Priority date | — |
| Expiry date | Apr 24, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present disclosure is directed to systems and methods for estimating rotational velocity and/or torque of a drill bit during certain drilling operations using torque and rotational velocity measured at a top drive system of the drilling operations. In certain embodiments, a drilling control system may estimate the rotational velocity and/or the torque of the drill bit using torque and rotational velocity detected at the top drive system, in conjunction with the governing equations of the drill string, the top drive, and the bottom hole assembly (including the drill bit itself), which may be transferred into the Laplace domain. In other embodiments, the drilling control system may estimate the rotational velocity and/or the torque of the drill bit using the torque and rotational velocity detected at the top drive system, in conjunction with a finite dimensional model approximation of the drill string based on an assumed mode shape of the drill string or a finite element model of the drill string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.