Real-time online analysis device and process method for carbon isotopes on drilling and logging site

The invention relates to the technical field of oil production engineering, in particular to a drilling and logging site carbon isotope real-time online analysis device which comprises a front gas taking device connected between a carbon dioxide analyzer and an isotope analyzer in a comprehensive logging instrument. The isotope analyzer is in network connection with the comprehensive logging instrument and keeps time synchronization with the comprehensive logging instrument server; an air inlet pipeline in the front sampling box is connected with a first pressure gauge and a drying pipe provided with a drying agent; the two-position three-way joint is connected with the first float flowmeter and the normal-pressure air outlet; the normal-pressure gas outlet is connected with a chromatographic gas inlet of the isotope analyzer; the two-position three-way joint is connected with a second float flowmeter through an air pipeline, and the second float flowmeter is connected with a booster air pump; the tee joint i