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What is gravel-sand size Ratio according to Schwartz?

What is gravel-sand size Ratio according to Schwartz? Correct Answer 40 percentile gravel/ 40 percentile sand

Gravel-sand size Ratio according to Schwartz is the ratio of 40 percentile gravel size to the 40 percentile sand size. Early work by Coberly in defining the gravel-sand size ratio considers only the problem of preventing movement of sand into the wellbore. Gravel-sand size Ratio according to Schwartz is also the ratio of 10 percentile gravel size to the 10 percentile sand size.

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