Ratio of field-wide Cumulative oil production
LaTeX Math Inline |
---|
body | --uriencoded--Q%5e%7B\uparrow%7D_O |
---|
|
to field-wide
Cumulative water injection LaTeX Math Inline |
---|
body | --uriencoded--Q_%7BWI%7D%5e%7B\downarrow%7D |
---|
|
:
LaTeX Math Block |
---|
|
{\rm ΣPIR} = \frac{Q^{\uparrow}_O}{Q^{\downarrow}_{WI}} |
It measures how efficiently waterflood supports the oil production and represent one of the key Waterflood Diagnostics.
The PIR can be related to the current Instantaneous Voidage Replacement Ratio (IVRR) as:
LaTeX Math Block |
---|
|
{\rm PIR}= \frac{1}{\rm IVRR} \cdot \frac{1-Y_w}{Y_w + (1-Y_w) \, \left[ \frac{B_o}{B_w} + \frac{B_g}{B_w} \, ( {\rm GOR} - R_s) \right] } =
\frac{1}{\rm IVRR} \cdot \frac{1}{{\rm WOR} + \, \left[ \frac{B_o}{B_w} + \frac{B_g}{B_w} \, ( {\rm GOR} - R_s) \right] } |
(see
LaTeX Math Block Reference |
---|
anchor | VRR_PIR |
---|
page | Instantaneous Voidage Replacement Ratio = IVRR |
---|
|
for derivation)
See Also
Petroleum Industry / Upstream / Production / Subsurface Production / Field Study & Modelling / Production Analysis / Waterflood Diagnostics
[ Instantaneous PIR ]