A kind of rapid pretreatment method of adamantane compounds in crude oil

Abstract

The invention provides a quick pretreatment method for adamantane compounds in crude oil. The quick pretreatment method comprises the following steps: preheating an instrument; inserting glass wool into the lower end of a sample tube, and transferring crude oil sample to the glass wool; putting a cylinder of a micro syringe into a condenser, and puncturing a sample injection cushion at the top end of the sample tube through a needle of the micro syringe to expose the top end of the needle from the bottom surface of the sample injection cushion; introducing nitrogen into the bottom of the sample tube, regulating the flow speed of the nitrogen to be 1-4mL / min, and adding an extracting solvent into the cylinder of the micro syringe; setting the heating temperature of a heating tank to be 270-310 DEG C, and heating and extracting the sample tube; after extraction is finished, pulling out the micro syringe, and transferring an extracting solvent (A) into a chromatographic sample injection bottle. According to the quick pretreatment method provided by the invention, the defects in the prior art are overcome, the damage to the instrument caused by a test sample can be effectively avoided, and the adamantane compounds in the crude oil sample can be accurately and quantitatively analyzed.

Description

Technical field [0001] The invention relates to a pretreatment method of adamantane compounds in crude oil samples, which is suitable for the pretreatment of condensate oil, light oil and normal crude oil in the field of oil and gas exploration, and belongs to the technical field of petroleum sample oil and gas geochemical analysis. Background technique [0002] Oil and gas accumulation analysis and testing technology has developed rapidly at home and abroad in recent years. Determining the maturity of crude oil is of great significance for identifying oil sources and making reliable evaluations of oil and gas resources. A variety of biomarker compounds can be used to study the maturity of source rocks and crude oil, but for medium and high maturity source rocks (vitrinite reflectance Ro> 0.9%~1.0%) and crude oil, the more effective biomarker compound indicators, such as C 29 Steranes 20S / (20S+20R), terpenes Ts / Tm, etc., fail due to reaching the equilibrium point of thermal evo...

AI Technical Summary

Problems solved by technology

When directly injecting samples, high-boiling components such as colloids and asphaltene in crude oil samples will directly damage the column efficiency and ion source, reduce the separation ability of the chromatographic column, and cause long-term damage to the chromatographic column, reducing the efficiency of the chromatographic column. Improve the sensitivity of mass spectrometry detection, increase the multiplier tube voltage

Although column chromatography can effectively separate crude oil components, this method requires more glassware, consumes a large amount of organic solvents, has a long cycle, pollutes the environment, and seriously endangers the health of experimenters

During the process, the solution needs to be rotatably evaporated in a water bath at 43-46°C until it is nearly dry (about 2mL); Light hydrocarbon components are easy to lose during the drying process, which has a great impact on the accurate quantitative analysis of adamantane, directly leads to errors in the analysis of adamantane compounds, and fails to accurately reflect crude oil information. The parameters obtained by using this pretreatment method need to be cautious use

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