Research on collapse prevention emulsions used in directional drilling in coal mine

The most effective way of controlling mine gas is to drain it by directional hole. PCM and TCA were taken as monomers to synthesize MZ-1 emulsion by inverse emulsion polymerization. Its rheological properties, collapse-preventing and ability for resisting pulverized coal pollution have been evaluated by laboratory experiments, and tested in borehole 9 at drill site 2 in ventilation detour at level 3 of Dongpang coal mine. The results showed that the drilling fluid prepared by MZ-1 emulsion had good rheology, high viscosity and shear force under condition of low concentration; the ability of collapse prevention was the stronger than that of imported emulsion A, B,vegetable gums and PHP; and its ability of resisting pulverized coal pollution was good, it had good rheology when the concentration of pulverized coal was up to 10%.