Variable inductor as downhole tuner
US8258724B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 2007 |
| Grant date | Sep 4, 2012 |
| Priority date | — |
| Expiry date | Feb 23, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05H11/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A tunable LC circuit is used to trigger an electron discharge from an accelerator device, such as a Betatron. The circuit includes a coil as a first inductor having a first inductance electrically coupled in series with a capacitor. A second inductor having a variable inductance is electrically coupled, either in series or parallel, to the first inductor. The time to capacitor discharge is governed by:τLC=√{square root over ((L+LTUNE)C)}.Adjusting the inductance of the variable inductor (LTUNE) facilitates continuous adjustment of the discharge time. This is particularly useful when the LC values change in response to external stimuli, such as borehole temperature when a Betatron is used to log borehole features.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.