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Helium porosity automatic measuring instrument

1、 Main technical indicators

1. Applicable rock cores: φ25mm、L≤80mm

2. Measurement pressure: 0.7MPa

3. Working medium: helium, nitrogen

4. Measurement accuracy: 0.5%

5. Ring pressure: 1.2MPa

2、 Method principle

The measurement of porosity is carried out by gas method, using nitrogen or helium as the measuring medium. The principle is based on Boyle's law, which means that a standard body with a known volume is used to cause isothermal expansion of gas into the core chamber at a set initial pressure. The gas diffuses into the pores of the core, and the effective pore volume and particle volume of the tested rock sample can be calculated based on the gas equation using the change in pressure and known volume. Therefore, the porosity of the rock sample can be calculated.

3、 Structural composition

The instrument consists of a standard chamber, a model cup, a core clamp, a pressure regulating valve, a pressure transmitter, a shut-off valve, and an air circuit system,

Purpose: The porosity analyzer is suitable for measuring the gas porosity of cylindrical rock samples, with a measurement range of 0.5% -60%.

Measurement principle: The measurement of porosity is carried out by gas method, using nitrogen as the measuring medium. The principle is based on Boyle's law, which means that a standard body with a known volume is used to cause isothermal expansion of gas into the core chamber at a set initial pressure, and the gas diffuses into the core pores. By using the change in pressure and the known volume, the effective pore volume and particle volume of the tested rock sample can be calculated based on the gas equation, and the porosity of the rock sample can be determined.

Instrument structure: The instrument mainly consists of a rock sample clamping system, a testing pressure regulation system, a measurement system, and a data acquisition and processing system.

Rock sample clamping system: mainly composed of pore volume clamps, particle volume clamps, etc. Used to measure the void volume and particle volume of rock samples separately.

Testing pressure regulating system: including pressure regulating valves, valve pipelines, etc. Provide stable testing pressure for rock samples.

Measurement system: mainly for pressure measurement, consisting of pressure transmitters and pressure digital meters.

Data acquisition and processing system: automatically collects pressure values and calculates the porosity of rock samples. Including data collection systems, software, computers, printers, etc.