To calculate the radius of investigation, five essential parameters are needed, and these parameters are permeability (k), porosity (φ), viscosity (μ), time (t) and total compressibility (CT).
The formula for calculating the radius of investigation:
rinv = 0.0325 √[Kt / φμCT]
Where:
rinv = Radius of Investigation
K = Permeability
φ = Porosity
μ = Viscosity
t = Time
CT = Total Compressibility
Let’s solve an example;
Find the radius of investigation when the permeability is 25, porosity is 18, viscosity is 12, time is 22 and total compressibility is 37.
This implies that;
K = Permeability = 25
φ = Porosity =18
μ = Viscosity = 12
t = Time = 22
CT = Total Compressibility = 37
rinv = 0.0325 √[Kt / φμCT]
rinv = 0.0325 √[25 x 22 / 18 x 12 x 37]
Then, rinv = 0.0325 √[25 x 22 / 7992]
rinv = 0.0325 √[550 / 7992]
rinv = 0.0325 √[0.068]
So, rinv = 0.0325 [0.26]
rinv = 0.0085
Therefore, the radius of investigation is 0.0085 ft.
How to Calculate the Radius of Investigation in Well Testing Using The Calculator Encyclopedia
Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the radius of investigation.
To get the answer and workings of the radius of investigation 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
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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 Well Testing under Petroleum
Now, Click on Radius of Investigation under Well Testing
The screenshot below displays the page or activity to enter your value, to get the answer for the radius of investigation according to the respective parameter which are the permeability (k), porosity (φ), viscosity (μ), time (t) and total compressibility (CT).
Now, enter the value appropriately and accordingly for the parameter as required by the permeability (k) is 25, porosity (φ) is 18, viscosity (μ) is 12, time (t) is 22 and total compressibility (CT) is 37.
Finally, Click on Calculate
As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the radius of investigation and presents the formula, workings and steps too.
