Method and apparatus for programmable pressure drilling and programmable gradient drilling, and completion
US7775299B2 · kind B2 · utility
14Cited by
7References
16Claims
0Family size
Inventors
Key dates
| Filing date | Dec 31, 2007 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | May 3, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/085
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for creating a programmable pressure zone adjacent a drill bit bottom hole assembly by sealing near a drilling assembly, adjusting the pressure to approximately or slightly below the pore pressure of the well bore face to permit flow out of the formation, and, while drilling, adjusting by pumping out of, or choking fluid flow into, the drilling assembly between the programmable pressure zone and the well bore annulus to avoid overpressuring the programmable pressure zone unless required to control the well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.