Patent ID: 8249842

Claim:
A method for evaluating a production well using black oil delumping, comprising: obtaining a vapor composition versus pressure table and a liquid composition versus pressure table; converting, using a simulator executing on a processor, a black oil wellstream into a compositional wellstream comprising a vapor component and a liquid component by: obtaining a first average saturation pressure weighted by liquid mass inflow rate from the production well; performing a first query in the liquid composition versus pressure table with the first average saturation pressure to obtain a corresponding liquid composition; calculating a liquid molar weight using the corresponding liquid composition; obtaining a second average saturation pressure weighted by vapor mass inflow rate from the production well; performing a second query in the vapor composition versus pressure table with the second average saturation pressure to obtain a corresponding vapor composition; calculating a vapor molar weight using the corresponding vapor composition; calculating a vapor fraction using the liquid molar weight and the vapor molar weight; and calculating a compositional wellstream for the production well using the vapor fraction; and evaluating the production well using the compositional wellstream.