Experiment device and method for gas adsorption and desorption of large rock samples with different sizes

A technology of gas adsorption and experimental device, applied in the direction of analyzing materials and instruments, to achieve the effect of simple structure, saving experimental cost, and low cost of water bath heating

Active Publication Date: 2015-06-17
CHONGQING UNIV
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  • Experiment device and method for gas adsorption and desorption of large rock samples with different sizes

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Embodiment 1

[0027] Embodiment 1: see figure 1 , gas adsorption and desorption experiment devices for large rock samples of different sizes, including a gas cylinder 1, a gas constant pressure device 3, a vacuum device 5, a core holder 7, a constant temperature heating device 11 and a metering pump 10.

[0028] The gas cylinder 1 communicates with the gas constant pressure device 3, and the gas constant pressure device 3 and the vacuum device 5 are combined and connected to a main pipeline through the three-way valve 4, and the main pipeline passes through the core holder inlet valve 6 and the core holder 7 The gas inlet is connected; the gas cylinder 1 is the gas source supply device of the experimental device, and during specific implementation, the gas cylinders can be multiple in parallel.

[0029] The rock core holder 7 is arranged in the constant temperature heating device; the constant temperature heating device preferably adopts a water bath constant temperature heating, and the sp...

Embodiment 2

[0036] Embodiment 2: a kind of experiment method that adopts the large rock sample gas adsorption and desorption experiment device of different sizes described in embodiment 1, specifically comprises the following steps:

[0037] S1: Put a core sample into the sample chamber of the core holder 7, apply a confining pressure and an axial pressure to the core sample by using a metering pump 10, and the axial pressure and the confining pressure are not less than 0.5 MPa of the gas pressure;

[0038] Check the airtightness of the device. After the airtightness meets the experimental requirements, close the pressure reducing valve 2 and the valve 4a of the gas constant pressure device, open the valve 4b of the sample chamber, the valve 4c of the vacuuming device and the inlet valve 6 of the core holder. Vacuumize the device so that the vacuum degree in the experimental device is not greater than -0.08MPa and lasts for not less than 4h;

[0039] Close sample chamber valve 4b, vacuum ...

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Abstract

The invention relates to an experiment device and method for the gas adsorption and desorption of large rock samples with different sizes. In the experiment device, a gas cylinder is communicated with a gas constant-pressure device, the gas constant-pressure device and a vacuum-pumping device are merged and connected to a main pipeline through a three-way valve, and the main pipeline is communicated with a gas inlet of a core holding unit through a core holding unit inlet valve; the core holding unit is arranged in a constant-temperature heating device; and a metering pump is connected with the core holding unit, and applies surrounding rock and axial compression to core samples in a core holding unit sample chamber. The experiment device not only implements the experiment requirements, but also achieves the effects of simple structure, low cost and easy operation; and when the experiment device is adopted for carrying out experiments, experiment results are more accurate and closer to the adsorption desorption of actual rock masses, and gas adsorption and desorption experiments of cores under the conditions of different sizes, different temperatures and different pressures can be performed in one experiment device.

Description

technical field [0001] The invention relates to an experimental device and method for oil and gas exploration and development or research gas adsorption and desorption in rock pores, in particular to a gas adsorption and desorption experimental device and method for large rock samples of different sizes. Background technique [0002] Many natural and man-made rocks in nature are not compact. They are porous solids and adsorbents that can adsorb one or more gases. Indispensable research parameters in . [0003] At present, the gas adsorption and desorption of most rock samples is obtained by rock blocks on site, and then crushed into certain particles by laboratory experimental equipment, which is fundamentally different from the actual rock samples in terms of scale and internal structure, which will lead to large discrepancies in the obtained results. The adsorption and desorption characteristics of rock samples cannot reflect the real formation conditions. In order to...

Claims

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Application Information

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IPC IPC(8): G01N7/00G01N7/04G01N7/14
Inventor 赵瑜何力何鹏飞陈宇超陈海林张东彦
Owner CHONGQING UNIV
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