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Effect of Weighting Materials Mixture on Wall Building Properties of HighDensity Drilling Fluid
Han Cheng, Qiu Zhengsong, Xu Fabin, Wei Anchao, Liu Zhiqin
Wall building properties of highdensity drilling fluid weighted with manganese tetroxide and traditional weighting materials(barite, iron ore powder)in different proportion were studied. Experimental results show that highdensity drilling fluid weighted with the compound of manganese tetroxide and traditional weighting materials were synthesized in the optimum proportion, the effect of small size and spherical manganese tetroxide particles filled into large size barite or iron ore particles was more obviously than one single weighting materials. When highdensity drilling fluid was weighted with manganese tetroxide with barite and iron ore respectively according to the quality ratio of 1∶4 and 2∶3, filtration and permeability of cake was lower.
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