Methods of drilling with a downhole drilling machine
US8636086B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2008 |
| Grant date | Jan 28, 2014 |
| Priority date | — |
| Expiry date | Aug 31, 2029 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B44/005
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drilling system and method are provided. The drilling system comprising a tool body, a drill bit, a mechanism for applying weight to the drill bit (“WOB”), and a control system for controlling the rate of rotation of the drill bit (“RPM”) and the weight applied to the bit during drilling. The control system is configurable to a first mode in which RPM and WOB are controlled to maintain power on the drill bit at a predetermined maximum, and a second mode in which RPM and WOB are controlled to maintain a predetermined depth of cut (“DOC”). In use, the control system is adapted to switch between the first and second modes depending on drilling conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.