Applying the TDS Technique to Identify and Analysis Wellbore Storage Effects

In many cases some pressure transit analysis tests give missing data for many reasons such as lack of early time pressure points or the test is too short, this makes it difficult to calculate some parameters. The objective of this study is to apply and show the advantage of Tiab’s Direct Synthesis (TDS) technique to estimate the wellbore storage effect when the early time region is missing. TDS technique is a direct method to interpret transient well pressure tests without type curve matching. This method uses log-log plots of the pressure and pressure derivative versus time to compute reservoir parameters such as permeability, wellbore storage, skin factor, half fracture length, drainage area, and distance to the boundaries, etc. This study includes analysis build up test for two oil wells (H1and H2) from X field by using TDS technique advantage which is calculating the wellbore storage effect in case of either unit slope line is not observed or both unit slope line and hump region are not observed.