摘要
粘土的膨胀和分散是引起地层伤害的两个重要因素。通过测定Zeta电位、XRD、悬浮液透光率、FT-IR考察了MD膜驱剂(MDFFA)对粘土稳定性的作用。结果表明,MDFFA的浓度低于0.3 mmol/g(以蒙脱土质量计)时,蒙脱土悬浮液Zeta电位的提高是由于膜驱剂分子的吸附改变了蒙脱土的层电荷;高于此浓度时,Zeta电位进一步提高是由于双电层的压缩。随着MDFFA浓度的增大,蒙脱土的完全膨胀层向部分膨胀层转化,并且经水冲洗、浸泡后,其XRD谱峰位置变化不大。较高浓度的MDFFA,能有效地抑制蒙脱土的分散,且不会形成对地层有害的絮凝体。MDFFA使蒙脱土层间水的含量明显降低。
Clay swelling and dispersion are the two important factors contributing to formation damage. Clay stabilization of molecular deposition filming flooding agent（MDFFA） was studied by Zeta potentials, suspensions transmittance, X-ray diffraction（XRD）, Fourier transform infrared spectroscopy （FT-IR）. The results showed that when MDFFA concentration was lower than 0.3 mmol/g （based on the mass of montmorillonite）, the Zeta potential of montmorillonite suspensions increased due to the decrease of interlayer charge attributed to adsorption of MDFFA on the clay. When MDFFA concentration was more than 0.3 mmol/g, with the increase of concentration, the Zeta potential further increased due to compressing double electricity layer. Furthermore, with the increase of MDFFA concentration, the fully expanded layers of montmorillonite moved closer together and some of them were converted into partially expanded layers and the peak situation of their XRD profiles didn＇t change after montmorillonite washed and marinated. At the concentration of 0.4 mmol/g, MDFFA could effectively inhabits the dispersion and couldn＇t form the flocculation resulting in formation damage. FT-IR data also showed that the content of interlayer water decreased when MD was added as the filming flooding agent.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2006年第3期79-84,共6页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
北京市教委共建计划项目(XK114140479)资助
关键词
MD膜驱剂
粘土稳定
双季铵盐化合物
粘土膨胀
粘土分散
molecular deposition （MD） filming flooding agent
clay stabilization
organic diammonium compound
clay swelling
clay dispersion
