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Oil correlations based on Gulf of Mexico oil samples.

Bubble point pressurepbpsia

LaTeX Math Inline
body--uriencoded--\displaystyle p_b =c_1 \cdot \left[ \frac%7BR_s%5e%7Bc_2%7D%7D%7B\gamma_g%5e%7Bc_3%7D%7D \cdot 10%5eX+ c_4 \right]
,
LaTeX Math Inline
body--uriencoded--X = c_5 \, T%5e%7Bc_6%7D + c_7 \, \gamma_%7BAPI%7D%5e%7Bc_8%7D

LaTeX Math Inline
bodyc_1 = 112.727, \ c_2 = 0.5774, \ c_3 = 0.8439, \ c_4 = -12.340

LaTeX Math Inline
body--uriencoded--c_5 = 4.561 \cdot 10%5e%7B-5%7D, \ c_6 = 1.3911, \ c_7 = -7.916 \cdot 10%5e%7B-4%7D, \ c_8 = 1.5410


Saturated gas solubility


Rsscf/stbp ≤ pb

LaTeX Math Inline
body--uriencoded--\displaystyle R_s(p, T) =\left[ \gamma_g%5e%7Bc_3%7D \cdot ( p/c_1 - c_4)\cdot 10%5e%7B-X%7D \right] %5e%7B1/%7Bc_2%7D%7D
,
LaTeX Math Inline
body--uriencoded--X = c_5 \, T%5e%7Bc_6%7D + c_7 \, \gamma_%7BAPI%7D%5e%7Bc_8%7D

LaTeX Math Inline
bodyc_1 = 112.727, \ c_2 = 0.5774, \ c_3 = 0.8439, \ c_4 = -12.340

LaTeX Math Inline
body--uriencoded--c_5 = 4.561 \cdot 10%5e%7B-5%7D, \ c_6 = 1.3911, \ c_7 = -7.916 \cdot 10%5e%7B-4%7D, \ c_8 = 1.5410


Saturated oil formation volume factor

Bobbl/stbp ≤ pb

LaTeX Math Inline
body--uriencoded--\displaystyle B_o(p, T) = c_1 + c_2 \cdot \left[ R_s%5e%7Bc_4%7D(p, T) \, \gamma_g%5e%7Bc_5%7D \, \gamma_o%5e%7Bc_6%7D + c_7 \, T%5e%7Bc_8%7D \right]%5e%7Bc_3%7D

LaTeX Math Inline
body--uriencoded--c_1 = 1.0113, \ c_2 = 7.2046 \cdot 10%5e%7B-5%7D, \ c_3 = 3.0936, \ c_4 = 0.3738

LaTeX Math Inline
bodyc_5 = 0.2914, \ c_6 = -0.6265, \ c_7 =0.24626, \ c_8 = 0.5371


Undersaturated oil isothermal compressibilitycopsi-1p > pb

LaTeX Math Inline
body--uriencoded--c_o(p, T) = c_1 \, R_s%5e%7Bc_2%7D(p, T) \, \gamma_g%5e%7Bc_3%7D \, \gamma_%7BAPI%7D%5e%7Bc_4%7D \, T%5e%7Bc_5%7D \, p%5e%7Bc_6%7D

LaTeX Math Inline
body--uriencoded--c_1 = 1.705 \cdot 10%5e%7B-7%7D, \ c_2 = 0.69357, \ c_3 = 0.1885, \ c_4 = 0.3272, \ c_5 = 0.6729, \ c_6 = -0.5906


where

LocationGulf of Mexico

LaTeX Math Inline
bodyp

psiaFluid pressure

LaTeX Math Inline
bodyT

°RInitial formation temperature

LaTeX Math Inline
body--uriencoded--\gamma_%7BAPI%7D

°APIOil API gravity

LaTeX Math Inline
body\gamma_o

fracOil specific gravity

LaTeX Math Inline
body\gamma_g

fracGas specific gravity


See Also


Petroleum Industry / Upstream / Petroleum Engineering / Subsurface E&P Disciplines / Reservoir Engineering (RE) / PVT correlations / Oil correlations

References

Petrosky, G.E., and F.F. Farshad. "Pressure-Volume-Temperature Correlations for Gulf of Mexico Crude Oils." Paper presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, October 1993. doi: https://doi.org/10.2118/26644-MS







LaTeX Math Inline
body--uriencoded--c_o = c_1 \, R_s%5e%7Bc_2%7D \, \gamma_y%5e%7Bc_3%7D \, \gamma_%7BAPI%7D%5e%7Bc_4%7D \, T%5e%7Bc_5%7D \, p%5e%7Bc_6%7D