What? – Enhanced Enhanced Oil Recovery – New New Method
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Gas Separation
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Rich Gas – Injection Injection
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Lean Gas – Lift Lift
Project Overview – What? Why? How? •
Why? – To To increase hydrocarbon recovery
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Prolong the life of field
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Ensure effective use of resources.
Project Ov Overview erview – What? Why? How? •
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How? – Various Various simulation and modeling software ECLIPSE – reservoir reservoir simulation and modeling
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PROSPER – gas gas lift analysis
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PVT – fluid fluid characterization
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Norne Field as Case Study
PVT Analysis •
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Determine the most effective fluid composition for injection and gas lift. Software: PVTsim – Fluid Fluid characterizatio characterization n and reservoir simulation program Uses reservoir fluid data to perform various reservoir tests and simulate phase behaviour. Find Minimum Miscibility Pressure
Minimum Miscibility Pressure (MMP) •
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the ability Miscibility – the of fluids to mix and form a homogenous solution Allows for effective and efficient oil production MMP - The minimum pressure for reservoir oil and gas to become miscible
Minimum Miscibility Pressure and PVTsim •
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MMP will be found using PVTSim for given oil and gas composition If MMP is similar to reservoir pressure, gas injection becomes more effective
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First Contact Miscibility
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Multi Contact Miscibility
Gas Lift Performance
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Prosper input Data – Gas Gas Lift Performance Performanc e Curve
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PVTsim Data Well/Reservoir Info Equipment Info
This curve will give us the optimum gas injection rate to achieve a maximum oil production rate Under-injection Under-injec tion vs. over-injection
Reservoir Simulation The Eclipse Simulation software will use inputs from both PVTsim and Prosper to apply our theory and measure the impact. Two separate simulation models will be used to measure the results: •
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A Simple block model (one producer and injector) Injector acts like a piston Uses uniform properties throughout the reservoir Runs quickly to allow for efficient calibration
Reservoir Simulation A full field dynamic geological model of the Norne Field (Offshore Norway). •
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Created from seismic interpretation, well logs, history matching, etc. Accurately models what is happening in the field during production Allows detailed analysis of the impact of our work
