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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.


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    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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