An experimental device for measuring the diffusion coefficient of natural gas

Abstract

The present invention discloses a new experimental device for measuring a diffusion coefficient of natural gas, mainly including a new core holder, a differential pressure sensor, pressure gauges, multiport valves, a confining pressure pump, a vacuum pump, a hydrocarbon gas source, a nitrogen gas source, a gas chromatograph, an intermediate container, sample chambers, a pressure stabilizing device, and pressure-sensitive alarm devices. A rubber sleeve of the new core holder can prevent a core from being stuck in the holder during core replacement due to an improper operation. The configured pressure stabilizing device is connected to the sample chambers, to ensure stable internal pressure in the chambers after sampling. In this way, one experimental variable is omitted, and an experimental result is more accurate and reliable. If gas leakage occurs. A sensor device can sense the gas leakage in time and sends an alarm to a mobile device of an experimenter.

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.

Images