Abstract: In order to realize the online monitoring of the high calorific value, total sulfur content, hydrogen sulfide content, carbon dioxide content and water dew point of natural gas product in all the natural gas purification plants of PetroChina Southwest Oil and Gas Field Company, the application status of the online analyzers corresponding to these five quality indexes is analyzed and studied. Some suggestions are put forward on the configuration, type selection and application management of corresponding online analyzers to achieve the reasonable configuration and use of online analyzers for natural gas quality index monitoring, so as to accurately and quickly guide the operation adjustment of natural gas purification unit in real time and meet the quality indexes of natural gas product stipulated in GB 17820-2018 Natural Gas.

Key words: natural gas purification plant, quality index of natural gas product, online analyzer, present situation, suggestion