This study has been conducted on two wells in Sarir oilfield to follow up the oil well test techniques and methods of analysis of these tests. The main objective of the well testing is to determine the viability of formation for the production of fluids and improved information about the well and the reservoir petrophysical properties (porosity, permeability, skin factor, follow up the barriers). Also testing is mainly carried out to recognize changing the flow rate of the well and the pressure response as a function of time. The data that depend on analysis pressure data is called Transient Pressure Testing. This study is focused mainly on one of the common well testing techniques is the buildup test using suitable software program for well testing calculations. On the other hand, Horner plot and Gringarten type curve are applied for data interpretation. This study has been performed on two oil wells at Sarir field are namely L-004-65 and C-173-65 to investigate the petrophysical characterizations of reservoir rocks. The study exhibits unacceptable results that obtained from calculations of petrophysical properties such as the low permeability (k) values, the positive values of skin factor (s), pressure drop due to skin factor (∆P_skin). According to these results the formation required to be stimulated to enhance these parameters to improve the production rates