DEVELOPMENT AND APPLICATION OF OIL WELL CEMENT DISPERSANTS SDJZ-1

Nowadays, the temperature tolerance and brine tolerance of oil well cement dispersant are poor, and the dispersant has delayed coagulation or foaming side effect and can not meet the well cementing requests in high-temperature, high-pressure and highly saline formation. Thus, the sulfonated ketone/aldehyde polycondensate dispersant SDJZ-1 was developed. In this paper, orthogonal test is done for optimizing the synthetic condition of the sulfonated ketone/aldehyde polycondensate, and the best condition is selected. The system appraisement of this dispersant is made, and the dispersant has been used in 6 oil wells in field. The experimental data show that the sulfonated ketone/aldehyde polycondensate has an excellent rheological behavior control ability which can increase the flow behavior index from 0.3 to 0.8, even to 1.0, with an effective presence in an amount of 0.4%-0.8% by weight of the cement; the dispersant has a good capacity of thermos-resistant and salt-resistant; the dispersant has an excellent compatibility with the oil cement retarder and fluid loss control agent and so on. The field application indicates that its effect obvious, satisfying the well cement requests in deep wells and complex formations and has a broad application prospect.