Research progress on wall sticking behavior of crude oil gathered and transported without heating

The unheated gathering and transportation technology of oil pipeline is an effective method of energy saving and consumption reduction in the later stage of oilfield development. However, improper setting of operation parameters can result in deterioration of fluid flow in the pipe and wall sticking, which seriously threatens the safety of oil production. In this work, the influence mechanism of the composition of crude oil and the complicated flow conditions on oil-solid sticking behavior was elaborated emphatically, the relationship between the wax crystal, asphaltene and acidic compound and the wall sticking behavior of crude oil was analyzed, and the two evaluation indexes(wall sticking temperature and wall sticking rate) and the research method of boundary condition in unheated gathering and transportation technology were sorted out. Based on the macroscopic research, the existing microscopic research methods of oil-solid interface interaction were summarized, and the wall sticking mechanism was described in terms of mechanical behavior. Finally, the suggestions for further deep research on wall sticking behavior were addressed.