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| Low pressure dry gas |
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| LaTeX Math Inline |
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| body | --uriencoded--c_t = c_\phi + c_%7B\rm fluid%7D = %7B\rm const%7D |
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| | LaTeX Math Inline |
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| body | --uriencoded--c_g = \sim \frac%7B1%7D%7Bp%7D |
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| LaTeX Math Block |
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| p(t) = p_i + \frac{\Delta Q(t)}{V_\phi \cdot c_t} |
| | LaTeX Math Block |
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| p(t) = p_i \exp \left[ \frac{\Delta Q(t)}{V_\phi} \right] |
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where
is Cumulative Voidage Replacement Balance (CVRB):
| LaTeX Math Block |
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| \Delta Q = - \frac{B_o - R_s \, B_g}{1- R_s \, R_v} \cdot \, Q^{\uparrow}_O + \frac{ B_g - R_v \, B_o}{1- R_s \, R_v} \cdot \, \left( Q^{\downarrow}_G - Q^{\uparrow}_G + Q^{\downarrow}_{GCAP} \right) + B_w \, \left( Q^{\downarrow}_W - Q^{\uparrow}_W + Q^{\downarrow}_{WAQ} \right) |
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The above approximations sometime allow using simple graphical methods for rough estimation of drainage volume
and associated
Hydrocarbon Reserves.
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