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ExcSim Development Ltd. is a UK-registered company developing and marketing the ExcSim Reservoir Simulator add-in for Microsoft Excel®. 

The ExcSim development department in Norway (ExcSim Norge) comprises subsurface professionals with decades of experience in the oil and gas industry. 

We believe that simplicity is the ultimate sophistication. Our mission is giving reservoir and petroleum engineers, geoscientists, independent consultants, and students quick, convenient, easy-to-use yet powerful and effective tools at an affordable price. Reservoir Simulator add-in for Excel* Fully implicit 2D reservoir simulator 3 phases:

• Oil, liquid and vaporized
• Gas, free and dissolved
• Water
• Over 1000 grid blocks and up to 100 wells
• Generate production and injection forecasts
• Optimize number and location of wells
• Improve sweep by optimizing injector locations
• Plan and design well tests
• Run sensitivities and what-if's
• Generate input to uncertainty analyses
• And more...