超低密压裂支撑剂的制备及性能研究

以二级铝矾土(65wt％Al2O3)和钾长石为原料,在添加不同含量的白云石的基础上制备了超低密高强的压裂支撑剂,并研究了白云石的添加量对烧成温度和石油压裂支撑剂性能的影响.结果表明:在原料中加入适量的钾长石,不仅可以降低烧结温度,同时还能降低压裂支撑剂的密度;添加白云石能有效降低支撑剂的烧结温度和破碎率,同时白云石和钾长石共同作用,促进了烧结致密化的进行,有利于棒状莫来石的生长发育,从而提高了支撑剂的强度.当白云石的添加量为2wt％,烧结温度为1330 ℃时,所制备的压裂支撑剂性能最优,其体密仅为1.30 g/cm3,52 MPa下的破碎率为4.51wt％.

Preparation and Properties of Ultra-light Weight Fracturing Proppants

Based on bauxite and a small amount of K-feldspar,ultra-light weight,high-strength fracturing proppants was prepared by adding the dolomite with different addiction.The influence of the addiction of dolomites on sintering temperature and properties of fracturing proppants was studied.The results show that a proper amount of K-feldspar can not only reduce the sintering temperature but also reduce the density of fracturing proppants.The addiction of dolomite can effectively reduce the sintering temperature and breakage ratio of proppants,while the dolomite and K-feldspar together to promote the formation of liquid phase,which is favorable to the growth of the rod-like mullite,thus the strength of proppants is improved.The proppants have a good performance with the bulk density and breakage ratio(under 52 MPa)of 1.30 g/cm3 and 4.51wt％apparently when the addiction of dolomite is 2wt％and the sintering temperature is 1330 ℃.