摘要
纯高岭土和油田实际岩心的流动模拟试验都验证了在相同温度下 ,加入盐酸会加快氟硅酸与铝硅酸盐的二次反应。在砂岩基质酸化过程中 ,H2 SiF6 AlFx(3 -x) + HCl之间存在一种化学平衡 ,该平衡用以控制氢氟酸与铝硅酸盐的一次反应和二次反应的化学计量系数。在土酸酸化反应中 ,盐酸不仅用来溶解碳酸盐矿物 ,而且具有调节氟硅、氟铝配合物平衡的另一作用 ;盐酸的浓度越高 ,F/Al越低 。
It is identified that hydrochloric acid can increase the secondary reaction of H2SiF6 with alumino-silicates by testing Kaolinite powder and oilfield sandstone core displacement test. There is a chemical equilibrium among H 2SiF 6-AlF x (3-x)+ -HCl which can be used to control the stoichiometric of primary and secondary reaction of HF with alumino-silicates during sandstone matrix acidizing. Results have revealed that HCl can not only dissolve carbonate minerals in the reservoir but also control the equilibrium between aluminum and silicon fluoride in mud acid treatments. The higher the concentration of HCl, the lower F/Al ratio, and the less the secondary damage by acidizing.
出处
《西南石油学院学报》
CSCD
2000年第2期57-61,共5页
Journal of Southwest Petroleum Institute
基金
中国石油天然气集团公司"九五"科技攻关项目<全三维水力压裂机理研究>! ( 960 5 0 2 )
关键词
化学平衡
基质酸化
砂岩
核磁共振
油层酸化
nuclear magnetic resonance, spectrometer, matrix acidizing, chemical equilibrium, sandstone
