The supply chain for oil refineries begins with both onshore and offshore oil reserves. These locations are used to extract crude oil, which is then shipped to several refineries worldwide, mostly by pipelines or big vessels known as Very Large Crude Carriers (VLCCS). Crude takes a while to transport. For instance, Crude oil transported by a VLCCS from the Middle East to refineries in Asia takes four to six weeks, Nonetheless, the transportation of crude oil from the oil fields in Marib by a Very Large Crude Carrier (VLCC) only necessitates a duration of three to four days (Block 18), Masila (Block 14), and Jannah (Block 5) to go to Kerla\'s refineries. Crude Extraction Units (CEU) are used to treat the crudes and divide them into fractions according to their boiling points. To obtain the diverse products, these segments undergo further processing in a number of downstream refining facilities, such as blending pools, crackers, and reformers. When processing conditions are appropriately adjusted, a single crude mix can produce a variety of products and their variations. Refineries must therefore modify their processes to accommodate the various crude batches in order to satisfy the demands of their clients.