The image above represents the radial flow rate.

To compute for the radial flow rate, eight essential parameters are needed and these parameters are **External Pressure (P _{e}), Flowing Bottom-Hole Pressure (P_{wf}), Formation Thickness (h), Oil Viscosity (μ_{o} ), Permeability (k), Oil Formation Volume Factor (B_{o}), Drainage Radius (r_{e}) **and

**Well Bore Radius (r**

_{w}).The formula for calculating the radial flow rate:

Q_{o} = ^{0.00708kh[Pe – Pwf]} / _{μo Bo In[re / rw]}

Where;

Q_{o} = Radial Flow Rate

P_{e} = External Pressure

P_{wf} = Flowing Bottom-Hole Pressure

h = Formation Thickness

μ_{o} = Oil Viscosity

k = Permeability

B_{o} = Oil Formation Volume Factor

r_{e} = Drainage Radius

r_{w} = Well Bore Radius

Let’s solve an example;

Find the radial flow rate when the External Pressure is 14, Flowing Bottom-Hole Pressure is 21, Formation Thickness is 7, Oil Viscosity is 35, Permeability is 50, Oil Formation Volume Factor is 13, Drainage Radius is 26 and Well Bore Radius is 15.

This implies that;

P_{e} = External Pressure = 14

P_{wf} = Flowing Bottom-Hole Pressure = 21

h = Formation Thickness = 7

μ_{o} = Oil Viscosity = 35

k = Permeability = 50

B_{o} = Oil Formation Volume Factor = 13

r_{e} = Drainage Radius = 26

r_{w} = Well Bore Radius = 15

Q_{o} = ^{0.00708kh[Pe – Pwf]} / _{μo Bo In[re / rw]
}Q_{o} = ^{0.00708 x 50 x 7 [14 – 21] }/ _{35 x 13 In[26 / 15]
}Q_{o} = ^{0.00708 x 50 x 7 [-7] }/ _{35 x 13 In[26 / 15]
}Q_{o} = ^{0.00708 x 50 x 7 [-7] }/ _{35 x 13 In[1.73]
}Q_{o} = ^{0.00708 x 50 x 7 [-7] }/_{35 x 13 x 0.55
}Q_{o} = ^{2.478 [-7] }/ _{35 x 13 x 0.55
}Q_{o} = ^{-17.346 }/ _{250.27
}Q_{o} = -0.069

Therefore, the **radial flow rate** is **-0.069** ^{STB}/_{day}.

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the radial flow rate

To get the answer and workings of the radial flow rate using the **Nickzom Calculator – The Calculator Encyclopedia. **First, you need to obtain the app.

You can get this app via any of these means:

**Web** – https://www.nickzom.org/calculator-plus

To get access to the **professional **version via web, you need to **register** and **subscribe **for** NGN 1,500 **per** annum** to have utter access to all functionalities.

You can also try the **demo **version via https://www.nickzom.org/calculator

**Android (Paid)** – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator

**Android (Free)** – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator

**Apple (Paid)** – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8

Once, you have obtained the calculator encyclopedia app, proceed to the **Calculator Map, **then click on **Petroleum **under **Engineering**

Now, Click on **Reservoir Fluid Flow **under **Petroleum**

Now, Click on **Radial**** Flow Rate**** **under **Reservoir Fluid Flow**

The screenshot below displays the page or activity to enter your value, to get the answer for the radial flow rate according to the respective parameter which are the **External Pressure (P _{e}), Flowing Bottom-Hole Pressure (P_{wf}), Formation Thickness (h), Oil Viscosity (μ_{o} ), Permeability (k), Oil Formation Volume Factor (B_{o}), Drainage Radius (r_{e}) **and

**Well Bore Radius (r**

_{w}).Now, enter the value appropriately and accordingly for the parameter as required by the **External Pressure (P _{e})** is

**14**,

**Flowing Bottom-Hole Pressure (P**is

_{wf})**21**,

**Formation Thickness (h)**is

**7**,

**Oil Viscosity (μ**is

_{o})**35**,

**Permeability (k)**is

**50**,

**Oil Formation Volume Factor (B**is

_{o})**13**,

**Drainage Radius (r**is

_{e})**26**and

**Well Bore Radius (r**is

_{w})**15**.

Finally, Click on Calculate

As you can see from the screenshot above, **Nickzom Calculator** – The Calculator Encyclopedia solves for the radial flow rate and presents the formula, workings and steps too.