Conventional pressure transient analysis (PTA) alone may not be a reliable scientific tool for safe oilfield operations and reservoir development, according to earlier studies. The pressure responses were plotted using a skilled simulator in this study to examine the application of PTA and produce an exhaustive analysis. The Nelson oilfield, which is in the UK's North Sea, specifically addressed reservoir characterization and field development in a highly deviated well. The work also used sensitivity analysis and log-log diagnostic plotting to create a model that best matched a short pressure build-up (PBU) test. As a result, reservoir characteristics like permeability, porosity, and reservoir height were modeled, computed, and analyzed alongside wellbore characteristics. For various wells in the Nelson field, averages of core logs, seismic data, and wireline logs were taken to verify the accuracy of these models. Reservoir characterization was accomplished using PTA in conjunction with field data, which improved pre-existing macro and micro datasets. The use of a simulator and such additional data undoubtedly helped to improve field development strategies as well.