Determining downhole fluid flow
US8093550B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 2009 |
| Grant date | Jan 10, 2012 |
| Priority date | — |
| Expiry date | Jan 6, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Tool for drilling a borehole and method for using such tool. The tool has an apparatus for determining a change in a drilling environment around the borehole that includes a source for generating neutrons to produce a radioactive isotope in a fluid flowing down inside the tool; a detector for detecting a change in gamma-ray radiation created from decay of the radioactive isotope when the fluid flows back up outside the tool; and means for relating the detected change in the gamma-ray radiation to the change in the drilling environment that includes borehole enlargement, fluid loss from the borehole and/or fluid entry into the borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.