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How the flow velocity is calculated in the context of gravel packing?

How the flow velocity is calculated in the context of gravel packing? Correct Answer Production rate ft3/sec / 50% of the open area of slots 50%

In the gravel-pack designing, the flow velocity is calculated by dividing the Production rate ft3/sec by50% of the open area of slots 50%.Mathematically, Flow velocity =Production rate ft3/sec / 50% of the open area of slots 50%.

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