Gas chromatography-isotope analysis combined device for measuring carbon isotopes on logging site

Abstract

The invention discloses a gas chromatography-isotope analysis combined device for measuring carbon isotopes on a logging site, which comprises a gas chromatograph and an isotope analyzer, wherein a peristaltic pump for controlling the flow rate and an electronic condenser for controlling the temperature and humidity are arranged between an outlet of an identifier of the gas chromatograph and a sample inlet of the isotope analyzer, the peristaltic pump collects carbon dioxide gas generated by combustion of hydrocarbon gas in the identifier and controls the flow rate, and the carbon dioxide gasis sent to the isotope analyzer for carbon isotope measurement after the temperature and humidity are controlled by the electronic condenser; and a pre-chromatographic column and a main chromatographic column of the gas chromatograph adopt a packed column, the aperture phi of the chromatographic column is 3 mm, the column length of the pre-chromatographic column is 2.5 m, the column length of themain chromatographic column is 5 m, and the chromatographic column is filled with a 60-80-mesh 13X molecular sieve. According to the invention, the light hydrocarbon content in the drilling fluid andthe contents of methane, ethane and propane carbon isotopes contained in the drilling fluid can be continuously measured in real time on the logging site. The technical conditions of isotope analysison the separation degree and the temperature and humidity of single gas are met.

Description

technical field [0001] The invention relates to the field of petroleum geological exploration and development, in particular to a gas chromatography-isotope analysis combined device for measuring carbon isotopes on the mud logging site, which is used for the development of shale oil, shale gas and coal-derived gas. Background technique [0002] Gas chromatograph is a mud logging instrument for measuring hydrocarbon gas in oil exploration and development operations, mainly including gas circuit control module, quantitative tube, pre-chromatographic column, main chromatographic column, 10-way rotary valve, thermostat, identifier and quantitative acquisition module , the working process is that after the sample gas passes through the pressure control module, hydrogen is used as the carrier gas. The sample gas intercepted by the quantitative tube is firstly separated by the pre-chromatographic column and the final separation by the main chromatographic column, and then reaches th...

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Problems solved by technology

[0005] The isotope analyzer takes a long time to measure a single gas, so the interval between different gases should not be less than 30 seconds, while the gas chromatographs currently used in the field are all fast chromatographs, and the separation time interval between methane and ethane is only 1- 2 seconds, can not meet the requirements

The identifier is an open gas outlet, which is in a vented state, and now it is necessary to collect the carbon dioxide gas generated after combustion. The change of gas flow rate caused by high temperature, high humidity, and pipe diameter change will affect the analysis and measurement of the carbon isotope analyzer.

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