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- Title
Effect of heating temperature on the microscopic mechanism of gelat in process of waxy crude oil.
- Authors
GUO Liping; JI Junmei; ZHANG Jiajun; ZHANG Lili; HE Huaidong; SHI Shaojun; YANG Bao
- Abstract
Heating temperature is the main factor affecting the gelling degree of waxy crude oil. According to the physical property data of oil products measured in the macro experiment, the wax crystal, colloid and asphaltene molecular models closest to the actual molecular structure of the experimental crude oil are selected to construct the waxy crude oil system. The molecular dynamics simulation is carried out with Materials Studio software to explore the influence of heating temperature on the micro mechanism of the gelation process of waxy crude oil. The results show that the condensation point of waxy crude oil can be determined by the curves of density-temperature and self-diffusion coefficient-temperature. When the temperature decreases, the molecular chain of waxy crude oil system changes from straight chain to curl state, and changes significantly at the condensation point temperature. The aggregation among the same molecules of wax crystal is the main factor of the gelation of waxy crude oil. The radial distribution function(RDF) between wax molecules has a peak value and concentration, which significantly increases the RDF peak value of the heating temperature at which the solidification point deteriorates. The results provide a basis for the study of the rheological properties of waxy crude oil gelling system from the perspective of intermolecular interaction mechanism.
- Publication
Journal of Northeast Petroleum University, 2022, Vol 46, Issue 4, p86
- ISSN
2095-4107
- Publication type
Article
- DOI
10.3969/j.issn.2095-4107.2022.04.008