Electromagnetic drilling apparatus
US5018590A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1990 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Feb 8, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/58
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Oil drilling apparatus for drilling deep boreholes. The apparatus includes a high frequency, high voltage, AC generator at the surface of the ground which is connected to an electromagnetic hammer drill bit located at the bottom of the borehole. Electric current is conducted along a special drill string to the electromagnetic hammer drill located at the bottom of the borehole. The drill string is electrically conductive to form a current flow path to the downhole electromagnetic hammer drill, while at the same time, drilling fluid flows along an axial flow path to the vibrating bit located at the bottom of the borehole. The electrically conductive drill pipe, the electromagnetic hamemr drill bit, and the pulse transformer, each form a subcombination of the present invention; and, jointly comprise a new method and apparatus for forming boreholes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.