Study On Flow Drag Reduction Modification Of Waxy Oil

Waxy crude oil is faced with problems such as low temperature fluidity and throughput decline in pipeline transportation.The key to safe transportation is to solve the problem of low temperature fluidity of waxy crude oil.With the decrease of temperature,wax crystals precipitate in crude oil,which leads to the increase of oil viscosity and flow resistance.Physical and chemical methods are often used to improve the flow.In this paper,the experimental study on flow drag reduction modification of waxy oil was carried out from the point of view of mixing light oil,adding drag reducing agent,pour point depressant and so on.First of all,combined with the flow improvement method of mixed dilute oil commonly used in the field,a study on the modification of waxy crude oil + mixed dilute oil was carried out in the laboratory,focusing on the effect of dilution on solid phase deposition.The results show that the solid deposition quality decreases with the increase of dilute oil mixing ratio and stirring rate,and increases with the decrease of wall temperature,the increase of oil temperature and the increase of oil wall temperature difference.The solid phase deposition law of mixed crude oil accords with the mechanism of molecular diffusion and is affected by the composition of dilute oil.Secondly,from the point of view of agent modification,drag reducing agent and pour point depressant were used to study the flow modification of waxy oil.The drag reducing agent used is high polymer drag reducing agent and the pour point depressant is nanometer pour point depressant.When drag reducing agent is added,the deposition quality decreases at first and then increases with the increase of drag reducer concentration at relatively high speed,and the wax deposition quality increases with the increase of drag reducer concentration at relatively low speed.When pour point depressant is added,the effects of pour point depressant,magnetic field and magnetic agent on the solid phase deposition of waxy oil are studied and analyzed.The results show that magnetic agent cooperation can further improve the solid phase deposition of waxy oil.