Computer-controlled oil drilling rig having drawworks motor and brake control arrangement
US4187546A · kind A · utility
39Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1977 |
| Grant date | Feb 5, 1980 |
| Priority date | — |
| Expiry date | Mar 15, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An oil drilling rig includes a racker, a power tongs, a drawworks having a motor and a brake, and a general purpose programmable digital computer associated with each to sequentially initiate the operation thereof. Closed-loop control systems for the drawworks motor and drawworks brake are included to provide control signals to a motor drive and to a brake actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.