Method of and a device and an electronic controller for mitigating stick-slip oscillations in borehole equipment
US10138721B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 2012 |
| Grant date | Nov 27, 2018 |
| Priority date | — |
| Expiry date | Apr 13, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D19/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method for mitigating stick-slip oscillations in borehole equipment while drilling a borehole in an earth formation is described. The borehole equipment is modelled by a computational model for computer simulation. The model has elements representing a particular mechanical and physical behavior of the borehole equipment. In a simulated stick mode of the borehole equipment, physical quantities are loaded to the elements, which quantities represent an initial state of the borehole equipment prior to a transition from stick mode to slip mode. From a simulation of such transition, a time response of rotational speeds of a drive system and bottom hole assembly of the borehole equipment is recorded and a lower limit of the rotational speed of the drive system is determined for which the rotational driven speed of the bottom hole assembly is zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.