The review of the influencing factors of inorganic salt fouling behavior is mainly focused on the effects of flow rate, temperature and concentration on the mass of fouling deposition, induction period and thermal resistance. In this paper, the microscopic fouling behaviors such as morphology structure, attachment position and particle size are selected as research objects. The effect of material surface characteristics (roughness, contact angle and surface energy) on the microscopic fouling behaviors are reviewed, which can provide the basis for revealing the difference macroscopic fouling behavior of different materials surface from a microscopic point of view. At the same time, the current research status of fouling adhesion strength is summarized to provide theoretical support for the removal of fouling and the selection of reasonable antifouling materials.

The formation and stability mechanism of crude oil foam is the key to solve the problem of crude oil foaming. The basic properties of foam, features of crude oil foam are introduced in this paper and the research status of crude oil foam formation and stability mechanism is expounded. The experimental research methods of crude oil foam are summarized, and the influencing factors of crude oil foam formation and stability such as the composition of oil, temperature and gas properties are discussed according to experimental methods. Based on the current research, the future direction of research is proposed. The stability mechanism of crude oil foam and the influence of mechanical action on foam are still to be studied and there is no practical test method of crude oil foam at present.