Motivation =  maintain formation pressure at sweep interface with chemical injection and reduce residual oil to EOR sweep   $//<![CDATA[ \begin{array}{l}s_{or \, eor} < s_{orw}\end{array} //]]>$.

where  $//<![CDATA[ \begin{array}{l}s_{wi}\end{array} //]]>$ – inititial water in oil pay,  $//<![CDATA[ \begin{array}{l}s_{ori}\end{array} //]]>$ – residual oil to injection sweep. 

CО2 injection

See also

Petroleum Industry / Upstream /  Production / Field Development Plan / Recovery Methods