Method to optimize drilling efficiency while reducing stick slip
US9388681B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 2013 |
| Grant date | Jul 12, 2016 |
| Priority date | — |
| Expiry date | Aug 17, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D17/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Reducing or eliminating stick-slip and vibrations downhole may include controlling top drive torque in order to adjust drill bit angular speed in a manner that prevents, eliminates, or reduces stick-slip and vibration. Control methods and systems may include solving one or more optimization problems including an objective function. The objective function may be subject to conditions including a physical model of the drilling system. The objective function may be minimized without reference to a model, but instead by reference to estimated stick-slip frequency based upon a drill bit angular speed profile. In addition, actual downhole measurements for use in control methods and systems, such as drill bit angular speed, may be estimated using an observer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.