He discusses important landmarks, features and proportions.
他讨论了重要的里程碑，功能和比例。
The features and proportions of slurry and effect of borehole wall protection in different loose strata were mainly introduced.
重点介绍了松散地层不同地层泥浆特性、配比及护壁效果、措施。
Using the sand pack model, the percolation features of low permeability cores with various clay minerals and different proportions of clays are studied under different fluid injection patterns.
通过室内填砂管渗流实验，研究了不同粘土类型、不同粘土比例的低渗透岩心在不同流体注入方式下的渗流特性，并根据实验结果分析了其渗流机理。
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