Methods and apparatus for controlled directional drilling of boreholes
US4739841A · kind A · utility
53Cited by
7References
30Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 15, 1986 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Aug 15, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/022
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In the representative embodiments of the present invention described herein, new and improved methods and apparatus are disclosed for measuring various forces acting on an intermediate body between the lower end of a drill string and the earth-boring apparatus coupled thereto whereby the magnitudes and angular directions of bending moments and side forces acting on the earth-boring apparatus can be readily determined so that predictions can be made of the future course of excavation of the apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.