The image above represents the well bore storage factor.

To compute for the well bore storage factor, two essential parameters are needed and these parameters are **Well Annulus Cross-Sectional Area (A _{o}) and Fluid Density (ρ).**

The formula for calculating the well bore storage factor:

C = ^{144Ao} / _{5.615ρ}

Where;

C = Well Bore Storage Factor

A_{o} = Well Annulus Cross-Sectional Area

ρ = Fluid Density

Let’s solve an example;

Find the well bore storage factor when the well annulus cross-sectional area is 54 and fluid density is 42.

This implies that;

A_{o} = Well Annulus Cross-Sectional Area = 54

ρ = Fluid Density = 42

C = ^{144Ao} / _{5.615ρ}

C = ^{144 x 54} / _{5.615 x 42}

C = ^{7776}/_{235.83 }

C = 32.97

Therefore, the **well bore storage factor **is **32.97.**

**Calculating the Well Annulus Cross-Sectional Area when the Well bore Storage Factor and the Fluid Density is Given.**

A_{o} = ^{C x 5.615ρ} / _{144}

Where;

A_{o} = Well Annulus Cross-Sectional Area

C = Well Bore Storage Factor

ρ = Fluid Density

Let’s solve an example;

Find the well annulus cross-sectional area when the well bore storage factor is 34 and fluid density is 24.

This implies that;

C = Well Bore Storage Factor = 34

ρ = Fluid Density = 24

A_{o} = ^{C x 5.615ρ} / _{144}

A_{o} = ^{34 x 5.615 x 24} / _{144}

A_{o} = ^{4581.84} / _{144}

A_{o} = 31.81

Therefore, the **well annulus cross-sectional area **is **31.81.**