Physical absorption gas degassing cylinder, degasser and degassing method

Abstract

The invention provides a physical absorption gas degassing cylinder, a degasser and a degassing method. The degassing cylinder comprises a cylinder cover and a cylinder body, the cylinder cover is connected with a cylinder opening in a screw-in threaded manner, and a seal ring for sealing is disposed between the cylinder opening and the cylinder cover. The cylinder cover is provided with a gas collection port, a gas collection port seal cover is arranged on the gas collection port, the gas collection port seal cover is connected with the gas collection port in a screw-in threaded manner, and a seal gasket for sealing is disposed between the gas collection port seal cover and the gas collection port. The gas collection port seal cover is provided with a gas extracting port. The cylinder cover is further provided with a water injection-drainage port, a water injection-drainage port seal cover is arranged on the water injection-drainage port, the water injection-drainage port seal cover is connected with the water injection-drainage port in a screw-in threaded manner, and a seal gasket for sealing is disposed between the water injection-drainage port seal cover and the water injection-drainage port. The water injection-drainage port is as high as the gas collection port. Part of saturated salt water in the degassing cylinder is pumped and the interior of the cylinder is vacuumed by evacuating the degassing cylinder, so that physical absorption gas of a sample is desorbed completely. Extracting efficiency and component content of the physical absorption gas can be improved, quantitative analysis technics can be improved for the physical absorption gas, and accuracy of data analysis is guaranteed.

Description

technical field [0001] The invention relates to the field of oil and gas chemical exploration, and more specifically relates to a physical adsorption gas degassing bottle, a degassing device and a degassing method. Background technique [0002] Atoms or ions on the solid surface, due to the asymmetric force of surrounding atoms or ions on it, there is a residual valence force field, which can adsorb gas or liquid. Solid samples can adsorb gases and liquids in the environment. There are two types of adsorption: physical adsorption and chemical adsorption. By extracting and analyzing the gas or liquid physically adsorbed by the solid sample by certain means, the geochemical information of the environment in which the solid sample is located can be obtained. [0003] At present, the common method for extracting physically adsorbed gas in oil and gas geochemical exploration is to use headspace technology (see Oil and Gas Industry Standards - Oil and Gas Geochemical Exploration...

AI Technical Summary

Problems solved by technology

There are problems with headspace technology: ① use 250ml saline bottle to fill the sample (see figure 1 ), the diameter of the bottle mouth is very small, it is difficult to load the sample into the bottle, the sample loading time is long, and the physical adsorption group in the sample is lost more; ②The saline bottle used is a glass bottle, which is easy to break and is not easy to transport; The rubber plug is sealed, and the rubber plug is thin and easy to leak; ④ Part of the desorbed physical adsorption components are diluted by the headspace air on the one hand, and on the other hand, the sampling, desorption and analysis processes are greatly affected by the ambient temperature and pressure. It is also greatly affected by lithology, and sometimes the content of light hydrocarbons in the headspace gas does not have a linear relationship with the volume or weight of the sample, nor can it be converted into the amount of light hydrocarbons contained in the sample per unit volume or unit weight

[0004] Chinese patent CN1458509A (preparation method for adsorbed gaseous hydrocarbons in rocks) patent technology provides a technology and device for extracting physical adsorption gas in rocks; problems in this patent: ①The device is complicated and not suitable for use in the field; ②The sample needs to be crushed and loaded The crushing tank is sealed, and part of the physical adsorption gas is lost during the sample crushing process; ③After the crushed sample is put into the crushing tank and sealed, vacuumize with a vacuum pump, and part of the physical adsorption gas will be sucked away

There are problems in this patent: ① After the sample is put into a closed container, it needs to be vacuumized, and most of the physical adsorption gas will be sucked away. The adsorption gas is mainly desorbed by acidolysis to destroy the adsorption surface. The extracted gas is chemical adsorption gas, not non-physical adsorption gas. ; ② The device is complex and requires more acid hydrolysis reagents

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