Infrared gas detection system suitable for oil-containing gas analysis of reservoir

Abstract

The invention relates to the technical field of gas detection, in particular to an infrared gas detection system suitable for oil-containing gas analysis of a reservoir, which is characterized by comprising a vacuum pump, wherein the vacuum pump is used for dedusting and drying gas desorbed in a drilling process and conveying the desorbed gas into a constant-current stabilizer through a gas pipeline; after the flow of the gas is stabilized by the constant-current stabilizer, the gas enters from an inlet of a detection chamber and is continuously exhausted from an outlet of the detection chamber; the detection chamber comprises a temperature control mechanism used for thermostatically heating and controlling a heating element in the detection chamber so that the detection chamber forms a constant-temperature gas chamber; three infrared light sources, namely a light hydrocarbon gas infrared light source, a heavy hydrocarbon gas infrared light source and a CO2 infrared light source, which have the absorption peak wavelengths of three gases comprising light hydrocarbon gas, heavy hydrocarbon gas and CO2 gas, are arranged on a gas route vertical to the constant-temperature gas chamber; after passing through the gas vertical to the constant-temperature gas chamber, the three infrared light sources are received by three photoelectric receiving tubes in three photoelectric receiving circuits; and after the three infrared light sources are amplified by an amplification processing circuit, absorption light-wave intensities of the three gases, namely the light hydrocarbon gas, the heavy hydrocarbon gas and the CO2 gas, are displayed on a displayer along a time axis. The system has the characteristics of high reliability, convenient operation and low cost.

Description

technical field [0001] The invention relates to the technical field of gas detection, in particular to an infrared gas detection system suitable for oil and gas gas analysis in reservoirs. The geological information of the set layer. Background technique [0002] How to visually distinguish the dry and wet gas layers in the drilled formation through the gas logging curves on site, and divide the oil, water layers and oil-water contact, so as to provide rapid decision-making services for exploration and development, is an important research goal of gas logging. The gas ratio method has made an effective exploration and attempt for the realization of this goal. This method of interpretation and evaluation is based on the direction and intersection of the three curves of light-medium, light-heavy and heavy-medium hydrocarbon gas ratios to judge and divide the reservoir. The standard combination feature map is used to illustrate, and the feasibility and effectiveness of the me...

AI Technical Summary

Problems solved by technology

However, since the temperature has a direct impact on the spectral data of the incoming gas detected by the infrared light through the interferometer and the spectral analysis workstation, the data obtained are different under different temperature conditions, therefore, the temperature will affect the consistency of the spectral data

In addition, the use of infrared light interferometers and spectral analysis workstations is expensive and requires a relatively large operating space

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