Method for logging fluid flow rate, water fraction, and/or salinity of water flowing into a well
US4574193A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1984 |
| Grant date | Mar 4, 1986 |
| Priority date | — |
| Expiry date | Dec 26, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/111
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The disclosure relates to a well logging method which is capable of providing an indication of salinity and water fraction of the production fluid of a borehole. This indication of borehole parameters may be obtained through the use of a conventional gamma ray logging system that detects gamma rays produced by isotopes created from neutron activation of oxygen, sodium, and chlorine that may be present in the production fluid. A logging sonde is passed twice through a portion of interest in the borehole at two different logging speeds. The fluid velocity relative to the sonde may be determined using these two logging speeds and a displacement distance which reflects the time required for a detector associated with the sonde to reach fluid activated by neutrons produced by the sonde. From these measurements and knowledge of the flow cross-section and parameters of the sonde, the fraction of water in the production fluid and the salinity of the water may be determined for each portion of interest of the borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.