Hydrogen isotope analysis method of light hydrocarbon monomer hydrocarbon in natural gas and light hydrocarbon enrichment apparatus

Abstract

The present invention provides a hydrogen isotope analysis method of a light hydrocarbon monomer hydrocarbon in natural gas and a light hydrocarbon enrichment apparatus. The apparatus comprises a natural gas sample cylinder, a light hydrocarbon collection bottle, a water removal purification pipe, a light hydrocarbon enrichment tube and a temperature control box; the natural gas sample cylinder and the water removal purification pipe are in communication, a connecting pipe of the natural gas sample cylinder and the water removal purification pipe is provided with a gas-pressure meter and a first needle valve; the water removal purification pipe is in communication with one end of the light hydrocarbon enrichment tube, a connecting pipe of the water removal purification pipe and the light hydrocarbon enrichment tube is provided with a tee joint, and the tee joint is in communication with the light hydrocarbon collection bottle; the other end of the light hydrocarbon enrichment tube and a gas flowmeter are in communication, a connecting pipe of the light hydrocarbon enrichment tube and the gas flowmeter is provided with a second needle valve; the other end of the light hydrocarbon enrichment tube is provided with a third needle valve; and the temperature control box is arranged outside the light hydrocarbon enrichment tube. The hydrogen isotope analysis method of the light hydrocarbon monomer hydrocarbon in the natural gas is completed by use of the light hydrocarbon enrichment apparatus. The hydrogen isotope analysis method of the light hydrocarbon monomer hydrocarbon in the natural gas and the light hydrocarbon enrichment apparatus have the advantages of simple structure, easy and fast operation, high analysis data accuracy and good repeatability.

Description

technical field [0001] The invention relates to a hydrogen isotope analysis method for light hydrocarbon monomers in natural gas and a light hydrocarbon enrichment device for natural gas, belonging to the field of petroleum geological exploration. Background technique [0002] Natural gas is a high-quality, efficient, clean and low-carbon energy. my country is rich in natural gas resources, but the proven degree is low and the development potential is great. Developing key technologies for natural gas exploration and development and accelerating the development of the natural gas industry are of great strategic significance for adjusting my country's energy structure, improving people's living standards, promoting energy conservation and emission reduction, and addressing climate change. [0003] The gas components and their carbon and hydrogen isotope data in natural gas play an important role in the study of the origin, source and maturity of natural gas. However, due to...

AI Technical Summary

Problems solved by technology

However, the determination of light hydrocarbon components / monomer carbon isotopes of natural gas cannot be used to determine the hydrogen isotopes of light hydrocarbon monomers, because 1 H and 2 Relative mass difference ratio between D 12 C and 13 C is large, and the fractionation of hydrogen isotopes is more obvious in the same change process

In the front-end freezing method, after the cold trap is withdrawn, each light hydrocarbon compound can produce obvious hydrogen isotope fractionation in the process of changing from solid to gas, which will lead to deviations in analysis results

[0006] In order to solve the problem of isotope determination of low-concentration components in natural gas, Henning et al. designed a set of gas sampling and injection system for the determination of C 1 -C 5 Hydrocarbon isotopes of alkane monomers, but the system has no enrichment effect and is not suitable for hydrogen isotope analysis of light hydrocarbon monomers

Chinese patent applications with publication numbers CN103048412A and CN103048394A, the designed pre-enrichment chromatography-isotope mass spectrometry analysis system can be used for hydrogen isotope analysis of low-abundance hydrogen in natural gas, but due to the use of 5A molecular sieve as the adsorbent and online sampling In this way, problems such as hydrogen isotope fractionation effect and chromatographic peak broadening and overlapping caused by excessive dead volume may occur during the enrichment analysis of light hydrocarbons

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