Novel natural gas diffusion coefficient measurement experimental device

Abstract

The invention discloses a novel natural gas diffusion coefficient measurement experiment device which mainly comprises a novel rock core holder, a differential pressure sensor, a pressure gauge, a multi-way valve, a confining pressure pump, a vacuum pump, a hydrocarbon gas source, a nitrogen gas source, a gas chromatograph, an intermediate container, a sample cavity, a pressure stabilizing deviceand a pressure sensing alarm device. The rubber sleeve of the novel rock core holder can prevent the phenomenon that the rock core is clamped in the holder due to improper operation when the rock coreis replaced, the pressure stabilizing device is connected with the sample cavity to ensure that after the sampling is finished, the internal pressure of the cavity is kept stable, one experimental variable is reduced, and the experimental result is more accurate and reliable. The pressure sensing alarm device presets a pressure lower limit value before the experiment is carried out, if the equipment leaks air during the experiment, the pressure is reduced to a lower limit value, the sensing device can sense and send a warning to the mobile equipment of the experimenter in time, which is of great significance to ensure safe performance of the experiment.

Description

technical field [0001] The invention relates to an experimental device, in particular to a new experimental device for measuring the diffusion coefficient of natural gas. Background technique [0002] The diffusion coefficient of natural gas is an important parameter in the process of gas reservoir engineering. In the study of percolation theory, the diffusion coefficient of gas is also involved in the description of the diffusion item in the well test model. At present, the diffusion coefficient measurement experiments on the market are all carried out in accordance with industry standards, and there are common defects. On the one hand, when replacing the core, it is necessary to place the core column at the entrance of the holder and then use the column to push the core to the middle of the holder. If the operation is not performed properly, the core will be easily stuck in the holder. . Especially when measuring brittle cores such as shale, the sample will be crushed di...

AI Technical Summary

Problems solved by technology

Especially when measuring brittle cores such as shale, the sample will be crushed directly in severe cases

On the other hand, when sampling, a part of the gas will be artificially released, resulting in a decrease in internal pressure, and changes in the experimental conditions before and after sampling, and no relatively scientific experimental conditions have been formed.

In addition, the diffusion experiment of natural gas generally takes a long time. Once the equipment leaks, it is difficult to find it in time, and the leakage of methane gas will also cause safety hazards.

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