Dual-optical-path modulated detection method used during infrared spectroscopy gas logging

Abstract

The invention discloses a dual-optical-path modulated detection method used during infrared spectroscopy gas logging. The characteristic absorption of gas molecules in a certain waveband range is utilized to analyze and distinguish the category of gas, and the concentrations of the gas to be detected is inversed according to the absorption spectral intensity; a long-optical-distance gas absorption celltechnology is adopted; an alternative flowing type gas path modulation technology is adopted so that the stability of a system can be well improved; a single-light-source dual-optical-path modulation technology is adopted to meet the whole-range alkane type gas detection from low concentration to high concentration. The method adopts a 32M gas absorption cell, a 2.4M gas absorption cell, an infrared light supply, a light source power supply module, a near-infrared spectrograph, a spectrograph power supply module, an industrial machine electrical connector and a displayer. The structure is simple, the fastest response time is 1S, the traditional fastest response time is 30 S, accurate detection of alkane type gases of 10 ppm can be achieved, and the concentrations of several different gases can be detected in the same wave band.

Description

technical field [0001] The invention belongs to the technical field of mud logging, and in particular relates to a dual optical path modulation detection method in infrared spectrum gas logging mud logging. Background technique [0002] At present, oil is one of the most important strategic resources among all energy sources in the world today. It is not only the main driving force of modern economic development, but also a military resource and diplomatic resource, and a bargaining chip in the game of international relations. Petroleum has now become the lifeline of the national economy and the guarantee of security. It is directly related to the country's economic development, political stability and national security. Therefore, vigorously developing my country's petroleum industry, increasing the supply of oil and gas, and reducing the dependence on imported crude oil and refined oil not only meet the requirements of the energy industry of the national economy, but also...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a dual optical path modulation detection method in infrared spectrum gas logging mud logging, aiming to solve the problems of many auxiliary equipments, many failure causes, complicated process and inaccurate results in the current real-time and accurate detection method of oil and gas information

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