Group 1 - The core point of the article is that China National Petroleum Corporation (CNPC) has applied for a patent for a device and method for dynamically measuring corrosion in light hydrocarbons, which aims to accurately predict the corrosion process and extent caused by sulfides in storage tank walls [1]. Group 2 - CNPC was established in 1999 and is primarily engaged in oil and natural gas extraction, with a registered capital of 18,302,097,000 RMB [2]. - The company has invested in 1,298 enterprises and participated in 443 bidding projects, holding 38 trademark records and 5,000 patent records, along with 168 administrative licenses [2].