Geoscience Reference
In-Depth Information
Recommended correlation equations for estimation of coefficients
of isothermal compressibility of oil at reservoir pressures less than
bubblepoint pressure
Equation (3.16a) is recommended. The derivatives for use in this
equation are taken from the recommended correlation equation,
equation (3.17a).
(3.17a)
Equation (3.17a) was derived using equations (3.8a)-(3.8f). The
values of the coefficients a 1 , a 2 , and a 3 are calculated with the constants
given with equations (3.8a)-(3.8f).
(3.17b)
Equation (3.17b) was derived using equation (3.21b).
The derivative of reservoir oil density with respect to pressure, which
is required in equation (3.17b), was derived using equation (3.19a).
(3.17c)
The first derivative on the right-hand side of equation (3.17c) was
obtained using equation (3.19b).
(3.17d)
Values of ρ a for use in equation (3.17d) may be estimated with good
accuracy using equation (3.17e).
(3.17e)
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