关键词: 深井套管,    ,  阴极保护,    ,  干扰,    ,  BEASY

Abstract: In order to study the problem on cathodic protection interference in deep well casing, in this paper, we use the boundary element method to establish the mathematical model of the pipeline cathodic protection interference. Then the BEASY software is adopt to study the influence of the soil conductivity, coating damage rate, anode output current, the distance between anode location and the casing, and the distance between two well casing on the law of the interference corrosion respectively. Simulation results show that with the increase of soil conductivity, the potential of whole pipeline is reduced, the distribution is uniform, and the degree of interference decreases. Smaller coating defects often make interference more concentrated, while with increase of anode output current, the pipeline interference corrosion intensifies. With the increase of anode distance and the distance between the two casing, the interference degree of casing corrosion reduces, and the interference style changes from anodic interference to cathodic interference. Finally, in view of the interference problems of deep well casing, we connect the two casing electrically, which can effectively avoid the interference corrosion between the casings.

Key words: Deep well casing,    ,  Cathodic protection,    ,  Interference,    ,  BEASY