Well testing for gas reservoirs

As natural gas is currently playing an important role in the growing energy demand and for the support of the energy transition due to its lower carbon emissions in comparison to other fossil fuels, ensuring the gas supply implies to increase the gas reserves and to maximize the gas production by having a sound reservoir management. Pressure transient analysis (PTA) provides valuable information regarding the reservoir, such as flow capacity, reservoir pressure, reservoir size, and wellbore conditions. Pressure transient tests can be analyzed by using analytical methods that can be sufficient to evaluate the reservoir performance if uniform reservoir properties are assumed. Nonetheless, we are facing challenging reservoirs which present heterogeneities, fissures, non-Darcy flow, water production, and liquid dropout in gas condensate reservoirs. To this end, numerical pressure transient analysis is used to deal with these challenges by removing the assumptions of uniform properties and use the information from pressure transient tests in numerical reservoir simulation to provide a model that can better describe the reservoir and predict its performance.