苯酚-硫酸法测定岩心中压裂液残余瓜胶含量

Technology Supervision in Petroleum Industry(2022)

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Abstract
建立了一种苯酚-硫酸法来测定岩心中压裂液残余瓜胶含量的方法,探讨了波长、显色时间等因素对实验的影响,并对该方法进行了精密度、稳定性和重现性评价.结果表明,在波长485 nm,显色时间30 min,苯酚-硫酸法建立的瓜胶标准曲线为A=0.00958ρ+0.03167,相关系数R2=0.99621,线性范围为20~200 mg/L,方法检出限L=67.86μg/g.该方法具有操作简单、稳定性好、精确度高、重现性好等特点.采用上述方法可以分析油气田压裂后岩心中残余压裂液的瓜胶含量,从而有助于储层伤害机理的分析.
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