含蜡凝析物中蜡分子扩散、聚集与沉积行为的影响机制OA

Based on the analysis of the basic physical properties of condensates,different molecular dynamics simulation sys-tems of waxy condensates covering different condensate gas fluid environments of methane,methane-ethane and methane-eth-ane-propane were constructed.The dynamic behavior of wax molecules in the presence of condensate gas was studied consid-ering the phase transition temperature and pressure conditions.The results indicate that the solubility of condensate gas in the system is the dominant factor affecting the diffusion behavior of wax molecules,and the synergistic effect of temperature and pressure exhibits can promote the wax molecules diffusion.The diffusion ability of wax molecules in different systems is meth-ane-ethane-propane system>methane-ethane system>methane system.Different from the increase of temperature,the binding energy between wax molecules decreases and the thermal motion intensifies,which further weakens the aggregation and depo-sition behavior of wax molecules.The increase of pressure not only compresses the spacing of wax molecules and promotes the aggregation of wax molecules,but also hinders the aggregation of wax molecules by increasing the solubility of gas in the sys-tem.High pressure can make the wax molecular layer deposited on the wall become dense,but it also increases the number of gas molecules dissolved in the oil phase,which will hinder the movement of wax molecules to the wall and weaken the deposi-tion behavior to a certain extent.