China National Petroleum Corporation applies for patents related to water-gas reservoir CO₂ injection, enabling visualization and simulation of CO₂ migration in gas reservoirs to assist in enhanced recovery.

March 30 news, according to information from the National Intellectual Property Administration, China National Petroleum Corporation has filed a patent titled “A Device for Visual Monitoring and Injecting CO into Edge and Bottom Water Gas Reservoirs”. The patent publication number is CN121740937A, the application number is CN202411358327.6, the patent publication date is March 27, 2026, the application date is September 27, 2024. Inventors are Li Zhongcheng, Han Haotian, Song Peng, Wang Hailong. The patent agency is Dalian Zhigao Patent Agency (Special General Partnership), and the patent agent is Ji Wanwan. Classification numbers are G01N24/08, G01N15/08, G01N30/02, G01N13/00, and G01N1/28.

The patent abstract shows that this invention belongs to the technical field of gas field development and research, and discloses a device and method for visually monitoring the migration and diffusion of injected CO2 in an edge and bottom water gas reservoir. The device includes a high-pressure piston container and an online nuclear magnetic holder; the lower-end interface of the high-pressure piston container is connected to a high-pressure ISCO injection pump, and the upper-end interface is connected to the injection port of the online nuclear magnetic holder; the recovery port of the online nuclear magnetic holder is connected to a back-pressure valve, the back-pressure valve is connected to a gas-liquid separator, and the gas-liquid separator is respectively connected to a liquid measuring device, a weighing device, and a gas measuring device; the upper end of the online nuclear magnetic holder is connected to a high-temperature and high-pressure circulation system to provide overburden pressure for the online nuclear magnetic holder. This invention precisely controls experimental pressure and temperature, realistically simulates the migration of CO2 in the edge and bottom water gas reservoir, and combines online nuclear magnetic equipment to visualize the seepage of CO2 in rock cores, providing certain guidance and technical support for improving the recovery rate of the edge and bottom water gas reservoir with CO2 injection.

China National Petroleum Corporation was founded on November 5, 1999, and was listed on the Shanghai Stock Exchange on November 5, 2007. The company’s registered address is in Beijing, and its office addresses are in Beijing and Hong Kong. It is a leading company in China’s oil and gas industry. Its core businesses include oil and gas exploration and development, refining and sales, and more, with advantages across the entire industrial chain, making it highly valuable for investment.

China National Petroleum Corporation’s main businesses include exploration, development, production, transportation and sales of crude oil and natural gas, as well as new energy businesses; refining of crude oil and petroleum products, production and sales of basic and derivative chemical products, and other chemical products, as well as new materials business; sales and trading of refinery products and non-oil products; and natural gas transportation and sales business. The Shenwan industry classification is Petroleum and Petrochemicals - Refining and Trading - Refining and Petrochemicals. It covers sectors such as main business polyethylene, Sinopec-related, “oil-to-” concept, and others.

In terms of operating performance, in 2025, China National Petroleum Corporation’s operating revenue reached 2864.469 billion yuan, ranking 1/5 in the industry, far exceeding the industry average of 1146.327 billion yuan and the median of 755.63 million yuan, and higher than the second-place company Sinopec’s 2783.583 billion yuan. In main business revenues, refining products revenue was 1972.824 billion yuan, accounting for 68.87%. Net profit was 172.005 billion yuan, also ranking first in the industry, higher than the industry average of 41.165 billion yuan and the median of 12.0568 million yuan, far exceeding the second-place company Sinopec’s 35.25 billion yuan.

The recent patent situation of China National Petroleum Corporation Limited is as follows:

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