China National Petroleum Corporation applies for patents related to pipeline regulation methods, with a high-voltage direct current interference-based control pipeline constant potential instrument output

March 30 news: Information from the National Intellectual Property Administration shows that China National Petroleum Corporation Limited has filed a patent titled “A pipeline multi-point control method, device, and equipment under ultra-high-voltage DC interference.”

The application publication number is CN121737718A, the application number is CN202411360098.1, the publication date is March 27, 2026, the filing date is September 27, 2024. Inventors are Zhong Xue, Zhang Wenyan, Deng Ziwei, Tang Ping, Yuan Bao, and Liu Liangguo. The patent agency is Chengdu Xingzhi Patent Agency Co., Ltd. The patent agent is Lin Feifei. Classification numbers are C23F13/04, G01D21/02, C23F13/22.

The patent abstract states that the invention discloses a pipeline multi-point control method, device, and equipment under ultra-high-voltage DC interference, which relates to the field of pipeline corrosion and protection. The key points of the technical solution are: obtaining the pipeline status parameters; inputting the status parameters into a pre-built first function mapping relationship to output the potential distribution of a pipeline that has not installed a constant-potential instrument; based on the potential distribution, using the potential zero point as a reference, determining multiple key control points where the constant-potential instruments are installed; determining the control coefficient of the constant-potential instrument installed at each key control point; using a particle swarm algorithm to randomly select the output current of the constant-potential instrument, and, based on the random selection results and the control coefficient, calculating the potential at each key control point; calculating the potential variance along the pipeline line based on the potential at each key control point; when the potential variance along the pipeline line is the minimum and satisfies the potential constraint conditions, obtaining the optimal output current of the constant-potential instrument; and controlling the output of the constant-potential instrument based on the optimal output current.

China National Petroleum Corporation Limited was established on November 5, 1999, and listed on the Shanghai Stock Exchange on November 5, 2007. The company’s registered address and office location are both in Beijing. It is the largest oil and gas producer and seller that dominates China’s oil and gas industry.

China National Petroleum Corporation’s principal business covers the exploration, development, production, transportation, and sales of crude oil and natural gas, as well as new energy businesses; chemical and new materials businesses such as refining of crude oil and petroleum products; sales and trading of refinery products and non-oil products; and the transportation and sales of natural gas. The industry it belongs to under Shenwan is Oil and Petrochemicals - Refining and Trading - Refining and Chemical Industry. The concept sector it belongs to includes main holdings in polyethylene, Sinopec-related, and “oil-to-chem conversion” concept.

In 2025, China National Petroleum Corporation’s operating revenue reached CNY 28644.69 billion, ranking No. 1 among the five companies in the industry, far exceeding the second-place China Petrochemical Corporation’s CNY 27835.83 billion. The industry average is CNY 11463.27 billion, and the median is CNY 755.63 billion. In terms of net profit, for the period it was CNY 1720.05 billion, also ranking No. 1 in the industry. The second-place China Petrochemical Corporation was CNY 352.5 billion. The industry average is CNY 411.65 billion, and the median is CNY 1205.68 million.

China National Petroleum Corporation Limited’s recent patent situation is as follows:

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