Difference between revisions of "Mobility Ratio"

Revision as of 14:28, 25 March 2022

Brief

Mobility Ratio determines the relative rate of one fluid to another (etc. water to oil).

M \le 1

oil is dominant flowing phase, stable flow.

M > 1

water preferentially flows in the reservoir, unstable flow, fingering.

Equation

M = \frac{k_w/ \mu_w}{k_o/ \mu_o}=\frac{k_{rw}/ \mu_w}{k_{ro}/ \mu_o}=\frac{q_w B_w}{q_o B_o}

where

B_o

= oil formation volume factor, m3/m3

B_w

= water formation volume factor, m3/m3

k_{rw}

= relative water phase permeability, function of the phase saturation, fraction

k_o

= oil phase permeability, function of the phase saturation, fraction

k_o

= relative oil phase permeability, function of the phase saturation, mD

k_w

= water phase permeability, function of the phase saturation, mD

M

= mobility ratio, fraction

\mu_o

= oil viscosity, cP

\mu_w

= water viscosity, cP

q_o

= oil rate, cc/sec

q_w

= water rate, cc/sec

Example

Determine the Mobility Ratio using the following data^[1]: Core is at 70% water and 30% oil saturation. Water phase permeability is 248 mD, oil phase permeability is 50 mD. Water viscosity is 1cP, oil viscosity is 3cP.

M = \frac{248/1}{50/3} =15

The mobility of water is 15 times higher than the mobility of water.

References

↑ Wolcott, Don (2009). Applied Waterflood Field Development. Houston: Energy Tribune Publishing Inc.

[DW-1] Wolcott, Don (2009). Applied Waterflood Field Development. Houston: Energy Tribune Publishing Inc.

[1]

@@ Line 25: / Line 25: @@
 ==Example==
-Determine [[Mobility Ratio]] using the following data<ref name=DW/>:
+Determine the [[Mobility Ratio]] using the following data<ref name=DW/>:
 Core is at 70% water and 30% oil saturation. Water phase permeability is 248 mD, oil phase permeability is 50 mD. Water viscosity is 1cP, oil viscosity is 3cP.

Navigation menu

Navigation

Categories

Products