Research on the Characteristics and the Interaction of Chang 6 Crude Oil from Yanchang Oilfield

To study the characteristics of components of crude oil and the interactions, chromatogram sepa- ration, Fourier Transform Infrared Spectroscopy (FTIR), Ultraviolet Spectroscopy (UV) and optical microscope methods were used to study the components, the thermal response process and the effect on the wax deposition behavior of Chang 6 crude oil from Yanchang oil field. The results in- dicated that aromatic hydrocarbons and saturated hydrocarbons will evaporate in low tempera- ture while resin and asphaltene will evaporate and react in high temperature. The interaction between the components can inhibit precipitation of wax crystal effectively. When added different polarity components, the behaviors of saturated hydrocarbons are quite different from the crude oil. The optical microscope analysis showed that the addition of resin and asphaltene to saturated hydrocarbons can increase the number of wax crystal particles and decrease their dimensions during the cooling crystallization process, and also the body of wax crystal will change from aci- cular and flake to spherical which can prevent the particles from contacting and crosslinking each other to form bulk wax crystal aggregation.