A STUDY OF THE DISPERSANT FOR MUD TO CEMENT AND ITS PROPERTY ANALYSIS

The reason of the system thickening when the mud is converted into cement slurry and the action mechanism and characteristics of different dispersants are briefly analyzed in this paper.In view of the characteristics of the high salt content and high pH value in the system when the mud is converted into cement slurry,a high efficiency dispersant——AB 1 suitable for mud to cement is developed through a large number of experiments.AB 1 is a mixture of non ionic dispersant with anionic one.It is a brown fluid and easy to be solved in water,and it is stable at 230℃.Through the conversion experiments of the amphoteric ionic polymer and sulfonated system mud,it is found that AB 1 can make the rheologic property of the converted cement slurry obviously raised and has salt resistant and alkali resistant properties.In addition, AB 1 has no obvious influence on the strength in the early and later stages,and the same applied to the thickening time and water loss of the slurry body.AB 1 can be used for the complicated mud to cement in deep high temperature wells.