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LaTeX Math Block
anchorZ2DU0
alignmentleft
{\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
anchorVRR_PIR
pageInstantaneous Voidage Replacement Ratio = IVRR
for derivation)

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