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Thread: Clarification of term in Darcy's Law

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    Clarification of term in Darcy's Law

    Hey guys,

    In Reservoir Engineering Handbook by T.Ahmed at page 368 it say that velocity for radial flow is :

    v=5.615*0.001127*k/mu*dp/dr.

    What does "5.615 " mean? 0.001127 is the conversion factor from SI unit to Field units.

    Thanks.
    Last edited by pet_spec; 04-24-2013 at 04:49 PM.

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  3. #2

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    Re: Clarification of term in Darcy's Law

    5.615 = conversion factor, cu ft/bbl.
    0.001127 constant to convert darcy's unit to field units

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  5. #3

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    Re: Clarification of term in Darcy's Law

    5.615 = conversion factor, cu ft/bbl.
    0.001127 constant to convert darcy's unit to field units

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    Re: Clarification of term in Darcy's Law

    hi friend as stated earlier,
    the first thing you have to pay attention is the system of units.

    In US Oil field units

    Flow Rate is n Bbl/day
    Pressure in PSI
    and velocity is in ft/sec

    Initial darcy's law in field units has 1.127* 10^(-3) as constant for calculating q.
    now this q is in bbl/day q=v.A
    so to get v in ft/sec you need to multiply by 5.615 (since 1 bbl= 5.615 ft^3).

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