以二级铝矾土为主要原料,通过添加不同含量的长石在1350 ℃烧结温度下制备了高强度的刚玉-莫来石质陶粒支撑剂.通过X射线衍射(XRD)和扫描电子显微分析(SEM)对陶粒的物相组成及显微形貌进行表征.结果表明,所制备陶粒支撑剂的物相成组为刚玉和莫来石,而且发现随着长石添加量的逐步增加,可以明显促进莫来石的形核过程,并抑制其进一步长大.当长石添加量为8wt%时,所制备的陶粒支撑剂体积密度为1.72 g/cm3,在52 MPa闭合压力下的破碎率为3.2%,酸溶度为5.0%,满足油气开采行业的要求.
Ceramic proppant was prepared by the main raw material of 2nd grade bauxite and the additive of feldspar at 1350 ℃.The phase composition and microstructure of the proppant were characterized by XRD and SEM respectively.The results show that the phase composition of ceramic proppant is composed of corundum and mullite.As the content of feldspar increases, it is beneficial to boost the nucleation of mullite phase and restrain the growth of mullite.The prepared proppant displays the lowest breakage ratio of 3.2% under 52 MPa closed pressure, the bulk density of 1.72 g/cm3 and the acid solubility of 5.0% when adding 8wt% feldspar, which can meet the requirement in the field of oil and gas exploitation.
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