Figure Q_3 shows the relative permeability curves obtained by fluid injection fo

Question

Figure Q_3 shows the relative permeability curves obtained by fluid injection for a core sample in the laboratory. The core sample had length of 0.25 ft and diameter of 0.125 ft. The viscosity of the water and oil during the test are given as 0.6 cp and1.2 cp respectively. Define the term relative permeability What is meant by the terms drainage and imbibition? Indicate what type of process has taken place during the Explain your answer. Define the term critical water saturation and state its value from Figure Define the term residual oil saturation and state its value from Figure Q3 Calculate the mobility ratio when the water saturation is 40% Do you think the displacement is stable at 40% water saturation? What is the absolute permeability of the core sample? What would be the pressure drop registered when injecting water to a similar clean core sample at a flow rate 1.5 bbl/day?

Explanation / Answer

1.Relative Permeability

Flow of water or oil through rock formations is called Permeability.

Relative Permeability defined as a ratio of effective permeability of a particular fluid at a particular saturation to absolute permeability of that fluid at total saturation. Relative permeability calculation gives comparison of the different fluids flow in the formation.

2.Drainage and Imbibition

Drainage is a collection of rain water from all parts of the area flows towards lowest level side and forms small linear water flow and merges in the stream.

Imbibition is a process where the solids absorb water and swell by increasing their volume. Seeds and dry wood absorb water and they swell by occupying more volume. Seeds planted in soil absorb water, swell and then comes out from the soil.

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