| abstract |
The present invention relates to a coated rubber particle, its manufacturing method and its application as a plugging material in drilling fluid. The coated rubber particles of the present invention have a rubber inner core and a coating layer, wherein the fluorine element content (atomic %) of the inner core is 0-15%, and the fluorine element content (atomic %) of the coating layer is 30-80 %, and the 24h oil absorption rate of the coated rubber particles is less than 4%. The coated rubber particles of the present invention have good oil resistance, and are particularly suitable for use in drilling fluids, especially oil-based drilling fluids, as a plugging material. |