Fractional Flow Curve Construction Using Buckley-Leverett Method: A Case Study of the Masrab Oilfield in Libya

Abstract

Understanding and accurately calculating fractional flow curves is crucial for effective reservoir management and enhanced oil recovery. Various approaches for calculating fractional flow curves exist, including mathematical models, which can obtain different results. The main objective of this paper is to calculate fractional flow curves using the Buckley-Leverett method for two wells, P06 and P07, in the Masrab Oilfield in Libya, utilizing Excel Program for analysis. The study employs core analysis data to ensure accurate calculations.The fractional flow curve of well P06 does not display an S shape according to the Buckley-Leverett method, indicating high residual oil saturation at approximately 0.46, thus classifying the Sarir reservoir as an oil-wet reservoir. Similarly, the fractional flow curve of well P07 does not display an S shape and shifts to the left, with residual oil saturation at about 0.299. Both wells show consistent results because they are part of the same reservoir (Sarir).The observed deviation from the expected S shape in the fractional flow curves shows significant changes in the rock and fluid properties of the reservoir. These changes require further investigations to understand their impact on oil recovery and to address the oil-wet issue effectively. Identifying and mitigating these changes is essential for optimizing oil production and ensuring sustainable reservoir management.This study highlights the importance of accurate fractional flow curve calculations for effective reservoir management and the need for ongoing research to adapt to changing reservoir conditions. Further investigations are required to understand the changes in rock and fluid properties and address the oil-wet issue, ultimately leading to improved strategies for enhanced oil recovery.