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# Main reservoir engineering equations

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## Stock tank oil initially in place

where:

STOIIP - Stock tank oil initially in place;

v - the net bulk volume of the reservoir rock;

φ - the porosity, or volume fraction of the rock which is porous;

S_{wc} - the connate or irreducible water saturation and is expressed as a fraction of the pore volume;

B_{oi} - the oil formation volume factor, under initial conditions, and has the units reservoir volume/stock tank volume, usually, reservoir barrels/stock tank barrel (rb/stb).

## Darcy's law

*Q* - volumetric flow rate (m3/s or ft3/s)

*k* - permeability, (mDarcy or m2)

*A* - flow area perpendicular to L (m2 or ft2)

*μ* - viscosity, (Pa·s)

*(Pb - Pa)* - pressure drop (Pa or psi)

*L* - flow path length (m or ft),