Senior Reservoir Engineer · Hamburg · Est. 2002
Klaas
Kostro
About 24 years of dynamic reservoir simulation, history matching and M&A subsurface due diligence. North Sea, Russia, Africa and Germany. Operating through Reservoir GmbH, Hamburg.

Two parallel tracks. The consulting practice provides direct client value and field credibility. runspec.io is the asymmetric long-term bet.
runspec.io is live —
AI-assisted OPM Flow simulation.
Consulting enquiries runspec.io →
~20
Years field
experience
15+
Highly complex full-field
simulation studies
12
M&A due diligence
projects
9
Years operator
experience
Selected clients TotalEnergies· Wintershall-Dea· E.On· MunichRe· DTEK· Vulcan Energy
What I do Three service lines
01
Reservoir Simulation Studies
Highly complex full-field dynamic models using ECLIPSE, Intersect and OPM Flow. History matching, uncertainty workflows and probabilistic forecasting.
02
M&A Subsurface Due Diligence
Reserves assessment and technical evaluation for operators and financial institutions. Up to 11,000 wells per transaction across multiple geographies.
03
Reservoir Management & Advisory
Production optimisation, field development planning, AI-assisted workflow advisory and independent technical reviews.
The dual-track model
Consultant
and founder.
The consulting practice — senior reservoir engineering, dynamic simulation, M&A due diligence — is a premium one-person expert practice operated through Reservoir GmbH. It funds the operation and provides the field credibility that makes everything else credible.

runspec.io is launched and open for business — an AI-assisted OPM Flow simulation platform built on about 24 years of field practice. www.runspec.io →

nextreservoir.com is the next product venture — a subsurface work engine for individual engineers. Currently under construction. Learn more →

Each track validates the other.