Principal/Senior Reservoir Engineer

ORLEN Upstream Norway AS (OUN) is an oil and gas company that is growing, and we are searching for a Principal/Senior Reservoir Engineer.

The successful candidate will report to the Subsurface North Manager, however the role as Principal/Senior Reservoir Engineer includes responsibilities and tasks across the whole OUN portfolio. Subsurface is responsible for 23 producing and 7 sanctioned developing assets across 6 OUN core areas; Skarv, Ormen Lange, Valemon/Kvitebjørn, Yggdrasil, Sleipner, and Tommeliten.

Responsibilities include production forecasting of existing assets, identifying additional upside opportunities to unlock IOR/IGR potential, and follow-up of production performance and subsequent reserves impact during the start-up of sanctioned projects. Over the next 12 months, the Subsurface Department will be responsible for following the drilling of up to 35 production wells, taking new developments through internal project decision gates, and updating a number of geo- and simulation models. The Subsurface department is also responsible for providing reservoir engineering support for exploration (APA, farm-in, drill & drop decisions) and business development opportunities.

The successful candidate will be expected to perform field evaluations through the development of in-house models and the review of operator models. An OUN reservoir engineer is required to plan, review, and follow up production and infill drilling activities, and to represent and convey OUN's opinion in license committees. The role is responsible for maintaining a reserves and resource overview of assets and contributing to the evaluation of M&A opportunities to deliver production growth targets within OUN's portfolio.

This is an exciting opportunity to join an international team of highly motivated and dedicated colleagues, working in a fast-paced and rewarding environment.

Duties and responsibilities

Accountability & Main Tasks

• Recommend technical input to Subsurface Managers
• Support Reservoir Engineering Functional Lead for OUN in:
  • Internal Reserves Reporting
  • Reserves Based Lending (RBL)
• Responsible for reservoir management, including well production monitoring and reservoir performance for OUN's producing assets
• Recommend reservoir engineering requirements to support Asset and Exploration managers
• Develop, maintain, and quality control reservoir models for all producing fields and developments
• Provide support to drilling activities, field development drilling plans, and field data gathering, and reservoir monitoring programs
• Formulate drainage strategies for fields in the development phase
• Act as company expert and provide insights for integrated field development planning
• Identify, mature, review, rank, and promote reservoir development projects based on cross-department input through the OUN opportunity hopper
• Define the technical scope of field, laboratory, and analytical work to be performed in-house, by third parties and/or by ORLEN Group
• Review and oversee subsurface data acquisition and quality control in areas such as fluid sampling, pressure monitoring, transient testing, and PVT analysis
• Mentor less experienced reservoir engineers in the Reservoir Engineering team
• Establish and maintain strong working relationships with internal and external stakeholders, peers, and advisers. Participate in external meetings and industry events, and represent OUN as member in license committees and regulatory bodies, where appropriate

Qualifications

Education

• Master’s degree in Petroleum Engineering or a relevant discipline is preferred
  

Experience

• 8+ years of development and reservoir engineering experience within an E&P Company
• Experience working on both operated and non-operated assets
• Experience working in license committees, with the ability to act as a company expert to influence decisions
• Relevant experience may compensate for a lack of formal education
  

Language requirements

• Fluency in English, both oral and written
  

Technical requirements

• Expert knowledge of relevant reservoir engineering tools and software
• Deep understanding of technological advances and industry best practices in reservoir engineering
• Ability to influence in Full Economic Reviews
• Comprehensive expertise of all reservoir engineering disciplines involved in field appraisal, development and production (PVT, SCAL, well lift, well test analysis, well logging, hydraulic fracturing, well operations)
• Expert knowledge of production engineering, geology & commercial considerations including familiarity with Economic Reviews
• Well-established industry network
• Good analytical skills
• Proficient in IT and engineering software tools

Personal qualities

• A team player with strong relationship-building skills across different disciplines
• A strong sense of responsibility and ability to complete tasks with minimal supervision
• Potential for creativity and ability to interpret new knowledge and acquired information
• Good communication and presentation skills
• Ability to adapt to a changing environment

We can offer

• ORLEN Upstream Norway AS offers a sound professional environment with varied tasks
• Positive and supporting working environment
• Relevant professional training
• Competitive employment terms
• Attractive insurance and pension plans

We strive for diversity and consider all qualified applicants for employment without regard to ethnicity, religion, age, sex, national origin, or any other legally protected characteristics.

Applications will be reviewed on an ongoing basis.
Please note that we will only contact candidates selected for interviews. If you do not hear from us you should assume that your application has not been successful.

ORLEN Upstream Norway AS is an oil and gas company with its head office located in Stavanger, Norway. The sole owner is ORLEN S.A., which is the largest energy multi-utility in Central and Eastern Europe.

ORLEN Upstream Norway's key strategic goal is to supply gas to the ORLEN Group to meet growing market demand and bolster energy security in Central and Eastern Europe. We believe that this can be achieved through stable and diversified hydrocarbon production from the Norwegian Continental Shelf.

The company was established in 2007, and through a series of successful mergers and acquisitions, including INEOS E&P Norge, LOTOS E&P Norge, and KUFPEC Norway, it has grown into a recognized player on the Norwegian Continental Shelf. In 2025, the company ranked among the top ten largest hydrocarbon producers on the NCS. ORLEN Upstream Norway AS also has an extensive track record in exploration and is a partner in several key development projects, with Yggdrasil and Fenris being prime examples.

In 2024, the company’s name was changed from PGNiG Upstream Norway to ORLEN Upstream Norway to underline its affiliation with the ORLEN Group.

Currently, the company employs over 100 experienced professionals from all around the globe.