Its main effect is inhibiting clay shale hydration expansion, improve the quality of mud cake, protecting reservoir, also has the very good control effect of collapse.
它的主要作用是抑制泥页岩水化膨胀，改善泥饼质量，保护油层，同时也具有很好的防塌效果。
2
Nanjing silty clay with fine sand interbed is a sediment deposited alternately by silty clay and fine sand, appearing to be a "thousand layers cake";