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2. Determination of porosity By
Helium porosimeter

3. Introduction
Helium
porosimeter
Grain
volume
Porosity
Pore
volume
Grain
density

4. Helium porosimeter

5. Method
Isothermal
helium
expansion
Boyles &
Charles's law
Method

6. Theory
• Density & porosity of a rock is measured by clean & dried
plugs by a helium porosimeter.
• Now
The grain volume = Vg
Volume of empty sample container = Vs
Reference volume filled by He = Vr

7. When the gas is expanded from reference volume to sample
container then the pressure Px is recorded.
• By applying Boyles law,
𝑃1 𝑉1 = 𝑃2 𝑉2
𝑃𝑟 𝑉𝑟 = 𝑃(𝑉𝑟 + 𝑉𝑠 − 𝑉𝑔)

8. • When the Bulk volume of the specimen is determined by the
immersion of the specimen in mercury,then
Øhe =
𝑉 𝑏−𝑉𝑔
𝑉 𝑏
where,
Øhe = the effective porosity determined by the helium porosimetry.
𝑉𝑔 = grain volume
𝑉𝑏 = Bulk volume of the specimen determined by mercury
immersion

9. Apparatus diagram

10. Apparatus Description
Pressure
gauage
• gauge an instrument showing the pressure of
fluid
Sample
chamber
• compact chamber designed to allow easy
sampling
Reference
volume
• the given volume
regulato
r
• control valve that reduces the input pressure of a fluid
to a desired value at its output

11. Procedure
Connect process fitting at the point side of the
cabinet to a suitable gas facility
Remove the cap at the bottom of the transmitter.
Plug cable to the transmitter to the USB at the
right side of the computer.

12. Start appilab
Reset pressure display

13. Set reference pressure
Select matrix line

14. Billets (Calibrated discs)
Report & template

15. Run number
Trend facilities

16. Actions
Measure operation

17. Click start & follow the instructions of applilab
Shutoff procedure