For clean sandstone, the acoustic dispersion of compressional wave exists obviously when its porosity is more than 28%.
对纯砂岩，当孔隙度大于28%时存在明显纵波声频散。
Archie formula is established theoretically in clean sandstone model and applied to various reservoirs. It is the fundamentals of log interpretation.
阿尔奇公式是用纯砂岩模型建立的理论方程，应用于不同性质的储集层中，是测井资料综合解释的基础。
A scavenger function is realized because of the steel brush braced structure, and it can clean the sandstone and sundries in the pipeline.
由于采用钢刷支撑结构，因而又具有扫线功能，可将管道内的砂石杂物推出。
A scavenger function is realized because of the steel brush braced structure, and it can clean the sandstone and sundries in the pipeline.
由于采用钢刷支撑结构，因而又具有扫线功能，可将管道内的砂石杂物推出。
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