Measuring mud flow velocity using pulsed neutrons
US7669468B2 · kind B2 · utility
2Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2003 |
| Grant date | Mar 2, 2010 |
| Priority date | — |
| Expiry date | Jun 9, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/11
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to methods and apparatus for determining downhole mud flow rates and other downhole parameters. A method for determining a downhole parameter includes operating a pulsed neutron generator (6), pulsing the pulsed neutron generator (6) off, detecting a substantially unactivated drilling fluid slug at a known distance (d) from the pulsed neutron generator (6), and determining a time-of-flight (t) for the unactivated drilling fluid slug to travel from the pulsed neutron generator (6) to a detection point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.