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The wells analyzed in this Final Project are the A-1 well, T field. Reservoir in this field is gas reservoir with sandstone rock formation, so one of the problems in Field T is the sand problem. Due to the sand problem on well A-1, well test analysis must be done first, to see if there is any damage to the formation if the flow rate is increased.Identification of formation damage in a well can be done by doing Pressure Buildup test. The method used is pressure build up test by Horner method which is done manually and Pressure Derivative with Saphire software v.3.20. The determination of deliverability test was conducted by conventional methods C and n. Given the results of the analysis, the permeability value remains, the value of the skin decreased, and Initial Pressure also decreased. From the results of the tests, there were no significant changes, indicating no formationdamage. The results of the deliverability tests in 2017 decreased, due to initial pressure decrease. Based on the results of well testing, there is no formation damage, so the flow rate can still be increased according to the IPR curve.