2020-Present

Founder of Tracinvent AS

Focusing on developing new tracers for the petroleum industry.

Consultant for Scale Protection AS

2015-2020

Independent consultant at Institute for Energy Technology (IFE)

Independent research consultant at the Institute for Enegry Technology. Focusing on development of analytical methods for gas and water tracers. Synthesis and testing of new tracer compounds.

2001-2015

Research scientist at Institute for Energy Technology (IFE)

Development of analytical methods for gas and water tracers for gas and oil reservoirs. Synthesis of new tracer compounds

1998-2001

Senior technician at Dynea ASA

Developement and improvement of analytical methods using GC, HPLC and GC-MS.

1989-1998

Technician at Institute for Energy Technology (IFE)

Mass-spectrometric isotope analysis of geological material. Development and performance of isotopic analyses and chemical analyses applying MS, ICP-AES, AAS, HPLC and ion chromatography.

1987-1989

Chief technician at Norwegian Center for Agriculture Analysis

Analyses of soil and plant samples. Development of chemical and instrumental methods for analyses of soil and plant samples

1987-1989

Senior Laboratory technician at Zambia Agriculture Research Insitute

Training of laboratory personnel in chemical and physical analyses of soil and plant samples. Assignment through NORAD.

1979-1987

Technician at Norwegian Institue for Air Resarch (NILU)

Analyses of air samples and development of analytical methods for organic and inorganic compounds in air, using HPLC, ion chromatography and GC-MS.

1972-1979

Technician at Norwegian Food Safety Authority

Chemical analyses of food preserves by AAS, HPLC and GC. Development of analytical methods for food additives and contaminants.

Research Patents

Helge has been part of the research team developing several patents, for details, please refert to Justia Patents.

H. Stray, T. Bjørnstad, J. Kihle, T. Sira. WO2018093272A1: Tracers. 18.11.2016

K. Mueller, H. Stray. WO2017005882A1: Rare Earth Elements and Yttrium. 7.07.2016

H. Stray, J. Kihle. WO2014/207000 A1 : Mineral-encapsulated tracers. 24.06.2014

H. Stray. US10954428-B2: Alkoxyphenyl, carboxylic acid tracers. 30.05.2014

B. Krognes, S.O. Viig, Ø. Dugstad, H. Stray. US9856732-B2: Tracers for residual oil. 21.12.2012

H. Stray. US8895484: The use of biphenyl, terphenyl, and fluorene sulphonic acid based tracers for monitoring streams of fluids. 23.02.2011

H. Stray, Ø. Dugstad, S. Hassfjell. US7,560,690B2 : System for delivery of tracer in fluid transport and use thereof. 30.06.2005