摘要
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 Tm_2O_3 doped was prepared by pressureless sintering in the CaO-MgOAl_2O_3-SiO_2 system.The effect of Tm_2O_3 content on the sintering temperature,apparent density,acid solubility,phase composition and microstructure was studied.The results show that trace amounts of Tm_2O_3 can improve the acid resistance of fracturing proppant.When the additive amount of Tm_2O_3 is 1%,the fracturing proppant′s acid resistance is deteriorating.When the additive amount of Tm_2O_3 is above 1%,the acid solubility of fracturing proppant decreases gradually with the increase of additive amount of Tm_2O_3 because the acid resistance of the generated Al_5Tm_3O_(12) is excellent.When the additive amount of Tm_2O_3 is 20%,the lowest acid solubility goes down to 0.124%,which is reduced by 76.65%.
引文
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