PHASE-CHANGE HEAT-STORAGE MICROCAPSULE MATERIAL SUITABLE FOR COOLING DRILLING FLUIDS AND PREPARATION METHOD THEREFOR

The present invention belongs to the field of additives for drilling fluids, and particularly relates to a phase-change heat-storage microcapsule material suitable for cooling drilling fluids and a preparation method therefor. The phase-change heat-storage microcapsule material of the present invention is composed of a wrapping polymer wall material on the outside, a phase-change heat-storage material used as a core material and doping nano-graphite therein, the overall size of the microcapsule being within the range of 20-80 μm. When a drilling fluid reaches the phase change temperature thereof, the phase-change heat-storage material in the phase-change heat-storage microcapsule material suitable for cooling drilling fluids of the present invention undergoes phase change and heat absorption, such that a temperature rise of the drilling fluid is reduced; the polymer wall material performs a function of preventing leakage of the drilling fluid, and also enables the microcapsule to achieve certain mechanical st