A legacy built on
technical truth.
For over two decades, Petronexus has served as a trusted independent advisor to operators, financiers and governments navigating the complexities of the oil & gas sector.
Our founding story
Petronexus was founded in 2001 by a group of senior engineers who had spent their careers inside major oil companies and grew frustrated by the lack of truly independent, rigorous technical counsel available to the market.
Beginning with a small team of five specialists in London, we built our reputation one engagement at a time — earning trust through the quality and candour of our work, not through marketing or scale. Today, we employ over 60 technical professionals and have delivered projects across six continents.
Despite our growth, our founding ethos remains unchanged: every client engagement receives the same calibre of senior-led analysis and the same uncompromising commitment to accuracy.
Founded in London with 5 specialists
First international engagement — Nigeria deepwater
Expanded into LNG and gas monetisation
Opened offices in Aberdeen and Houston
Surpassed 100 international project deliveries
Energy transition advisory practice launched
60+ specialists, presence in 38 countries
Our core values
Technical Integrity
We never compromise our analysis for commercial convenience. Our recommendations are grounded in evidence, not expectation.
Client Focus
We immerse ourselves in our clients' challenges — understanding their business context, constraints and strategic objectives.
Rigorous Methodology
Every deliverable is subject to internal peer review. Quality is not a standard we aspire to — it is a discipline we enforce.
Collaborative Spirit
We believe the best outcomes emerge from genuine partnership — integrating seamlessly with client teams across disciplines.
Senior team
Dr. Jonathan Hargreaves
Formerly VP Reservoir Engineering, Shell International
Reservoir Simulation · Field Development Planning
Dr. Amara Osei-Bonsu
Former Principal Geophysicist, BP Exploration
Seismic Interpretation · Prospect Assessment
Claire Whitmore
Former Lead Process Engineer, TotalEnergies
FEED Studies · Facilities Optimisation
Mikhail Sorokin
Former Head of Safety, Equinor
HAZOP/HAZID · Risk Assessment · Regulatory
Ready to work together?
Contact us to discuss your project requirements.