To main content

Tonni Franke Johansen

Research Scientist

Tonni Franke Johansen

Research Scientist

Tonni Franke Johansen
Phone: 404 72 793
Email:
Department: Connectivity Technologies and Platforms
Office: Trondheim

Publications and responsibilities

Publication
https://www.sintef.no/en/publications/publication/1631977/

Ultrasonic tools are being used for imaging in a large variety of fields, spanning from medical applications in a hospital to applications deep down in oil and gas wells. When applying ultrasonic imaging techniques to image through elastic materials, such as steel, one of the main challenges these...

Authors Andreas Sørbrøden Talberg Tonni Franke Johansen Svein-Erik Måsøy Tarjei Rommetveit Svein Brekke Hefeng Dong
Year 2018
Type Academic article
Publication
https://www.sintef.no/en/publications/publication/1660031/

Sealing of new wells, and the increasing need of plug and abandonment (P&A) of old wells, has triggered research and development of new methods for saving time at this operation. Shale has proven to seal off the annulus in longer well sections; however, the detection and qualification of the...

Authors Tore Lie Sirevaag Tonni Franke Johansen Idar Larsen Rune Martin Holt
Year 2018
Type Academic lecture
Publication
https://www.sintef.no/en/publications/publication/1457451/

Dual-frequency band probes are needed for ultrasound (US) reverberation suppression and are useful for image-guided US therapy. A challenge is to design transducer stacks that achieve high bandwidth and efficiency at both operating frequencies when the frequencies are widely separated with a...

Authors Ola Finneng Myhre Tonni Franke Johansen Bjørn Atle J. Angelsen
Year 2017
Type Academic article
Publication
https://www.sintef.no/en/publications/publication/1512031/

Verification of annular barriers is essential for well integrity, with ultrasonic methods being central in well integrity testing for many decades. By doing ultrasonic pitch-catch measurements on a bench top laboratory setup developed to replicate an oil well casing, we were able to show that the...

Authors Andreas Sørbrøden Talberg Tonni Franke Johansen Idar Larsen
Year 2017
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/1404384/

Current methods for ultrasonic pitch-catch well logging use two receivers to log the bonded material outside a single casing. For two casings separated by a fluid, we find by simulation that increasing the number of receivers provides a better picture of the effect of the bonded material outside the...

Authors Erlend Magnus Viggen Tonni Franke Johansen Ioan Alexandru Merciu
Year 2017
Type Academic article