低密度中强度陶粒支撑剂的开发,既可以提高低渗透油气藏的开发效率又能显著降低油气开采成本.以Al2O3含量为63％的二级铝矾土为主要原料,以铁粉取代部分锰矿粉制备了低密度中强度陶粒支撑剂.结果表明:添加铁粉2％,锰矿粉3％、白云石1％时,在1 350℃下煅烧1h,有利于陶粒支撑剂中生成均匀分布的直径为0.3～1.0 μm棒状莫来石晶相,棒状莫来石起到纤维增韧作用,提高支撑剂的强度,使其在52 MPa的闭合压力下破碎率为5.29％,体积密度为1.63 g/cm3.随着铁粉添加量的增加,基体中液相大量增加,晶粒生长速度过快未能有效排除气孔,导致大量气孔包在晶粒之间,容易构成应力集中点而形成裂纹源,降低了支撑剂的密度和强度.%Light-weight middle-strength ceramisite proppant is beneficial to the improvement of productivity of low-permeability oil and gas reservoir,and is able to reduce the cost of oil and gas production significantly.The light-weight middle-strength ceramisite proppant was prepared from bauxite(63 wt％ Al2O3) by adding manganese mineral,part of that was replace by iron powder.The results show that strength of ceramisite proppant was improved by rod-like mullite with the diameter of 0.3 ～ 1.0μm,which playa remarkable role in the increment of fracture toughness,when iron powder content is 3 wt％,and manganese mineral content is 2 wt％,and dolomite content is 1 wt％ and sintering at 1 350 ℃ for 1 h.The breakage ratio is 5.29％ and bulk density was 1.63 g/cm3 under 52 MPa closure pressure.In addition,as the iron powder increase,he liquid phase increase in the matrix,many intergranular closed pores were formed as a result of the grain growth which was too speedy to eliminate pores.It is easy to form the crack source and reduce the density and strength of ceramisite proppant.
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