添加Tm_2O_3对Al_2O_3基压裂支撑剂耐酸性能的影响

Effect of Tm_2O_3 on Acid Resistance of Alumina-based Fracturing Proppant

采用常压烧结技术,在CaO-MgO-Al_2O_3-SiO_2体系中添加稀土氧化铥来制备氧化铝基石油压裂支撑剂。通过XRD和SEM等表征手段,研究Tm_2O_3对陶粒支撑剂的烧结温度、视密度、酸溶解度、物相组成和显微结构的影响,并探究其影响机理。实验结果表明:微量添加稀土Tm_2O_3就能提高压裂支撑剂的耐酸性,当Tm_2O_3添加量为1%(质量分数)时耐酸性能恶化,随着添加量的增加,生成耐酸性能优异的Al5Tm3O12,耐酸性能提高,当Tm_2O_3添加量为20%(质量分数)时,最低酸溶解度低至0.124%,降低幅度达76.65%。

The ceramic proppant of Tm2O3 doped was prepared by pressureless sintering in the CaO-MgO- Al2O3-SiO2 system. The effect of Tm2O3 content on the sintering temperature, apparent density, acid solubility, phase composition and microstructure was studied. The results show that trace amounts of Tm2O3 can improve the acid resistance of fracturing proppant. When the additive amount of Tm2 O3 is 1 %, the fracturing proppant＇s acid resistance is deteriorating. When the additive amount of Tm2 O3 is above 1%, the acid solubility of fracturing proppant decreases gradually with the increase of additive amount of Tm2O3 because the acid resistance of the generated Al5 Tm3 O12 is excellent. When the additive amount of Tm2O3 is 20%, the lowest acid solubility goes down to 0.124 %, which is reduced by 76. 65%.