Distribution of radioactive tags around or along well for detection thereof
US10551183B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2016 |
| Grant date | Feb 4, 2020 |
| Priority date | — |
| Expiry date | Dec 4, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A system disclosed herein is for determining position of a distal end of a tubular string in a wellbore formed in a subsurface formation. The system includes casing lining the wellbore, with the casing carrying a plurality of radioactive sources. A tubular string is disposed in the wellbore and carries a radiation sensor along a length thereof. A processor is associated with the radiation sensor, and is configured to measure intensity of radiation received from the plurality of radioactive sources, and determine the position of the distal end of the tubular string by correlating a formation or wellbore fluid property that varies as a function of position within the wellbore and the measured intensity of the radiation received from the plurality of radioactive sources.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.