A new method to calculate dynamic reserves of gas reservoirs with water

A new method,to calculate dynamic reserves of gas reservoirs with water by production historical data of single well(like gas production,water production,and tubing and casing pressure),is proposed.Simultaneously,single-well productivity and water invasion strength are obtained.The method eliminates the dependence on formation pressure of whole reservoir existing in conventional methods.It has been also used to calculate dynamic reserves of production well,and the results are accurate and reliable.