选择性渗透水泥石作用机理

Permeation Mechanism of Selectively Permeable Cement

通过水泥熟料颗粒表面的Zeta电位、相对润湿接触角的测定,考察了高分子聚乙二醇(PEG)的加入对于水泥颗粒表面性质的影响,为进一步分析水泥熟料颗粒的表面特性与水泥石选择性渗流之间的关系提供了理论基础。实验研究表明在wPEG<0.01时,水泥颗粒表面相对水湿性递增,颗粒的负Zeta电位增长幅度较小,水的相对渗透率增长较快。随着PEG浓度的增加,水泥颗粒相对油湿性增强,负Zeta电位量下降,水的相对渗透率下降,油相的相对渗透率变化缓慢。

Zeta potentials of cement particles and relative wetting contact angle were measured by means of electrophoresis and capillary ascending methods respectively. The effect of polyethylene glycol （PEG） on the surface property of cement particles has been inspected, which facilitates further studies on the relationship between the surface property and selective permeability. Experimental results indicate that the relative water wetting increases rapidly with only a minor change of the negative zeta potential of cement particles when PEG concentration is lower than 0.01, which causes rapid increase of the water relative permeability. With the increase of PEG concentration, zeta potentials and the water relative permeability decliner, while the oil relative permeability changes smoothly.