Asphaltene Phase Behavior Modeling Using Peng-Robinson 78A-EOS for a Crude Oil Sample from Buzurgan Oil Field

Asphaltenes are a solubility class that is thought to be the heaviest and polar component of the petroleum product. Asphaltene precipitation (AP) and deposition during oil production, processing, and transportation are key concerns for the oil industry. The current study analyzes the phase envelope of fluids and asphaltene precipitation of a real-live oil sample (bottom hole sample) from a well that was drilled in the Mishrif reservoir formation—Buzargan oil field in the Missan governorate in south-east Iraq. The study emphasizes a number of essential approaches for simulating asphaltene phase behavior using the Peng‒Robinson-78 advanced equation of state model for AP by using Multiflash software. The asphaltene precipitation envelope (APE) is the output of the equation of state, from which the authors may predict the operation conditions to avoid asphaltene precipitation. Prediction of these situations can improve reservoir performance and production systems ability to decrease asphaltene precipitation by regulating reservoir factors.