The image above represents minimum transient time.

To compute for the minimum transient time, five essential parameters are needed and these parameters are **permeability (k), porosity (φ), reservoir radius (r), viscosity (μ) and total compressibility (C _{T}).**

The formula for calculating the minimum transient time:

t = ^{9.48 x 104 φ CT r² }/ _{k}

Where;

t = Minimum Transient Time

k = Permeability

φ = Porosity

r = Reservoir Radius

μ = Viscosity

C_{T} = Total Compressibility

Let’s solve an example;

Given that the permeability is 11, porosity is 14, reservoir radius is 7, viscosity is 13 and total compressibility is 22.

Find the minimum transient time?

This implies that;

k = Permeability = 11

φ = Porosity = 14

r = Reservoir Radius = 7

μ = Viscosity = 13

C_{T} = Total Compressibility = 22

t = ^{9.48 x 104 φ CT r² }/ _{k}

t = ^{9.48 x 104 x 14 x 22 x 7²} / _{11}

t = ^{9.48 x 104 x 14 x 22 x 49} / _{11}

t = ^{1430721600} / _{11}

t = 130065600

Therefore, the **minimum transient time** is **13006500.**