Types of Reservoir Fluids, Composition and physical Properties, Phase Behavior, Equations of State, Lash & differential Calculation, Gas Reserve Estimate, Gas, Flow in Porous Media, Gas Well Testing, Hydrate, Types, Formation, Prediction and Preventions, Gas Flow in Pipes, Estimation of Bottom Hole Pressure, Unloading Gas Wells, Gas Composition, Analyzing Performance of Gas Wells, Underground Storage of Natural Gas.