From ModelTech Group:
Easy Well is an add-in for Microsoft Excel, which adds petroleum production decline forecast capabilities to your spreadsheet. With Easy Well installed, you can create Excel functions to forecast the future production from an oil well.
Analyze up to four unique production streams per well, commingle zones, and apply rate constraints with Easy Well. Just press the graph button to see visually how each parameter affects the forecast. Fine-tune your forecasts by adjusting any variable, Easy Well automatically recalculates the recoverable reserves to create the most accurate picture. Solve for initial production rate, annual decline rate, or decline exponent with the Easy Well function writer. Cersion 1.1.d may include unspecified updates, enhancements, or bug fixes.