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E_D = \frac{1-s_{wi}-s_{orw}}{1-s_{wi})}

where 

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bodys_{wi}
 – inititial water in oil pay, 
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bodys_{orw}
 – residual oil to water sweep. 

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E_D = \frac{1-s_{wi}-s_{org}}{1-s_{wi})}

where 

LaTeX Math Inline
bodys_{wi}
 – inititial water in oil pay, 
LaTeX Math Inline
bodys_{org}
 – residual oil to gas sweep. 

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E_D = \frac{1-s_{wi}-s_{org}}{1-s_{wi})}


Chemical EOR


Motivation =  maintain formation pressure at sweep interface with chemical injection and reduce residual oil to EOR sweep  

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bodys_{or \, eor} < s_{orw}
.

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