一、设备概述
本仪器是根据玻义尔定律设计的，所以等温环境很重要，故要求安装在非通气区，没有空气直接流通的室内实验台上，只要温度稳定在2%范围内，即可测得稳定的结果。
二、工作原理
气体孔隙度仪是测量体积的一种仪器，用它可以测定岩样的骨架体积和孔隙度体积，利用气体膨胀原理，即玻义尔（BoyLE）定律，已知体积的气体在确定的压力下向未知体积等温膨胀，膨胀后可测定平衡压力。平衡压力的大小取决于未知体积的大小，而未知体积的大小由玻义尔定律求得。
该仪器可用两种气体作为驱替介质，氮气和氦气。对于一般的砂岩可用氮气，对于较为致密的灰岩和孔隙较小的岩样可用氦气测定。用氦气的理由是：
①．微小的氦气（分子分子半径r=0.9A）作为介质能够进入与油藏岩石伴生的毛细管；
②．分子量低的氦气（M=4）对岩石具有较高的渗透能力；
③．岩石表面对氦气吸咐性较差。
三、仪器组成
3-1、带有调节器的高压钢瓶一个，瓶内压力约15MPa，用它来作仪器的气源(用户配备)。
3-2、气源阀：供给孔隙计调节器低于1MPa氦（氮）气，当供气阀关闭时，调节器通过常泄，使压力保持恒定。
3-3、调节器：将1MPa的压力准确地调节到0.6MPa以下。
3-4、供气阀：连接0.6MPa以下压力的气体到定容室和压力计，它是定容室体积的上游极限。
3-5、定容室：已知体积室。
3-6、样品阀：能使定容室内0.6MPa压力的气体连接到未知室体积上去，它是定容室体积的下游极限。
3-7、放空阀：使末知体积中的初始压力为0MPa，同时又可以使平衡后的气体放入大气。
3-8、压力计：测量体系中气体压力，用来指示定容室的压力准确达到0.6MPa以下，并指示体系平衡的压力。
四、主要技术参数：
适用范围：φ25mm 长度≤50mm
测量压力：0.7MPa
工作介质：氦气 氮气
测量精度：1%
I. Overview of equipment
This instrument is designed according to Boyle's law, so the isothermal environment is very important. Therefore, it is required to be installed in an indoor experimental platform in a non-ventilated area without direct air circulation, and stable results can be obtained as long as the temperature is stable within 2%.
Second, the working principle
Gas porosimeter is an instrument for measuring volume, which can be used to measure the skeleton volume and porosity volume of rock samples. By using the principle of gas expansion, that is BoyLE's law, the gas with known volume expands isothermally to the unknown volume at a certain pressure, and the equilibrium pressure can be determined after expansion. The equilibrium pressure depends on the unknown volume, which is obtained by Boyle's law.
The instrument can use two gases as displacement media, nitrogen and helium. Nitrogen can be used for general sandstone, and helium can be used for dense limestone and small pore rock samples. The reason for using helium is:
(1) tiny helium (molecular radius r=0.9A) can enter the capillary associated with reservoir rocks as a medium;
② Helium with low molecular weight (M=4) has high permeability to rocks;
③ The adsorption of helium on the rock surface is poor.
Third, the instrument composition
3-1, a high-pressure steel cylinder with regulator, the pressure in the cylinder is about 15MPa, which is used as the gas source of the instrument (provided by users).
3-2. Gas source valve: helium (nitrogen) gas with a pressure lower than 1MPa is supplied to the pore meter regulator. When the gas supply valve is closed, the regulator keeps the pressure constant through normal venting.
3-3. Regulator: Adjust the pressure of 1MPa to below 0.6MPa accurately.
3-4. Air supply valve: Connect the gas with the pressure below 0.6MPa to the constant volume chamber and pressure gauge, which is the upstream limit of the volume of the constant volume chamber.
3-5. Constant volume chamber: known volume chamber.
3-6. Sample valve: It can connect the gas with the pressure of 0.6MPa in the constant volume chamber to the unknown chamber volume, which is the downstream limit of the constant volume chamber volume.
3-7. Vent valve: The initial pressure in the unknown volume is 0MPa, and at the same time, the balanced gas can be released into the atmosphere.
3-8. Pressure gauge: It measures the gas pressure in the system, indicating that the pressure in the constant volume chamber is below 0.6MPa accurately, and indicating the equilibrium pressure of the system.
IV. Main technical parameters:
Scope of application: φ25mm length ≤50mm.
Measuring pressure: 0.7MPa
Working medium: helium and nitrogen.
Measurement accuracy: 1%
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