اثر فشار و تركيب درصد بر توزيع اندازه كريستال هاي واكس حين تخليه مخازن گازهاي ميعاني

Effects of Pressure and Composition on Wax Crystal Size Distribution during the Depletion of Gas Condensate Reservoirs

Wax crystallization and deposition in crude oils and petroleum products cause major difficulties in transportation lines and the storage of these fluids. Accurate knowledge of wax crystallization process and the effective parameters on it are required for minimizing these problems. In this paper wax crystallization phenomena has been studied using population balance and an appropriate thermodynamics model during the depletion of gas condensate reservoirs. Wax crystal size distributions have been predicted as a function of time and pressure depletion history in two synthetic gas condensate mixtures. Pressure decreasing rate affects on each stages of wax crystallization. Occurrence of dissolution and crystallization phenomena causes a retrograde behavior of solid formation in the gas condensate mixtures contain heavy hydrocarbon components with pressure decreasing.