Displacement Theory Part 1: Capillary Number and Wettability

Ratio of interfacial tension to viscosity

Ratio of viscous forces to capillary forces (correct)

Ratio of velocity to interfacial tension

Ratio of pressure gradient to interfacial tension

Using surfactants to lower interfacial tension (correct)

Decreasing viscosity of the displacing fluid

Increasing interfacial tension with miscible gas injection

Reducing pressure gradient with viscous polymer injection

Pressure drop per unit length

External friction with capillary forces

Interfacial tension with solid surfaces

Internal friction among moving fluid molecules (correct)

<p>Relative permeability curves</p> Signup and view all the answers

<p>$10^{-7}$ to $10^{-6}$</p> Signup and view all the answers

<p>By comparing relative permeability curves</p> Signup and view all the answers

<p>$\text{Surfactants, miscible gas injection, and/or very high pressure gradient by viscous polymer}$</p> Signup and view all the answers