Magnetorheological fluid apparatus, especially adapted for use in a steerable drill string, and a method of using same
US6257356A · kind A · utility
150Cited by
22References
40Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1999 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | Oct 6, 2019 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rotatable steerable drill string in which guidance module controls the direction of the drilling. A magnetorheological fluid in the module supplies pressure to pistons that apply forces to the wall of the bore and thereby alter the direction of the drilling. The pressure applied by the magnetorheological fluid is regulated by valves that apply a magnetic field to the fluid so as to increase or decrease its fluid shear strength thereby controlling the actuation of the pistons and the direction of the drilling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.