菱铁加重料酸溶性好,经酸化处理后,可使地层渗透率恢复80～96%。该加重料密度在3.5～3.9克/厘米~3之间,可用于水基和油基泥浆。在同样密度情况下,与重晶石加重泥浆相比,菱铁对流变性和机械钻速无影响,对钻具磨损较小,但本身耐磨性较好。此外,菱铁加重料还具有惰性强、磁性弱、价格便宜的优点,是保护油层的优良加重料。经各类型井使用证实,它具有明显的经济技术效益。 Siderite heavy material acid solubility, acidification, the formation permeability can be restored 80 ~ 96%. The weighted density of 3.5 ~ 3.9 g / cm ~ 3, can be used for water-based and oil-based mud. In the case of the same density, compared with barite heavier mud, siderite has no effect on rheology and ROP, but less wear on drill, but better wear resistance. In addition, siderite heavier material also has strong inertia, weak magnetic, the advantages of cheap, is to protect the oil layer of the fine material. The use of various types of wells confirmed that it has obvious economic and technological benefits.