PHDwin v2.10.3 PHDWin is a full-featured, completely integrated economics and decline curve software package written by petroleum engineers for the oil and gas industry. It offers a complete solution to manage, organize, and evaluate reserves and economics. Economics Flexible modeling available for almost any country including U.S., Canadian and international assets. Before and after tax calculations are included. Cases can be projected in any volume convention and economics reported in the volume and currency convention of choice. Flexible Economics Advanced modeling for prices, expenses, taxes and royalties Link to common price, expense, tax or royalty models Sophisticated ownership modeling Automated group reversions Multiple ownership decks Advanced reporting for combining ownership at report time Create custom product, revenue, expense and tax streams Investment grouping and tracking for capital budgeting Unparalleled Automated Group Calculations Dynamic Linking International and Custom Modeling