Method of downhole drilling and apparatus therefor
US6629570B1 · kind B1 · utility
Inventor
Key dates
| Filing date | May 12, 1999 |
| Grant date | Oct 7, 2003 |
| Priority date | — |
| Expiry date | May 12, 2019 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B44/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A downhole drilling apparatus suspended by tubing includes a drill bit driven by an electric motor powered by a cable means. The motor is mounted upon a hollow shaft which allows fluid to pass through, so that a fluid circuit along the tube and back along the annulus between the borehole and the tubing via the drill bit is established. The state of the motor, particularly its speed and torque, can be monitored, and the motor may then be regulated as a result of this data. Various sensors may be included in the drilling apparatus, and the data gathered similarly used to regulate the motor. Thrust means are included to urge the drill along the borehole. Supplementary pumps may be provided to assist the fluid flow. Both the thrust means and the pumps may be controlled by the control means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.