Petrochemical Machinery (000852): As the only oil and gas equipment supplier of Sinopec system and one of the leading domestic oil and gas equipment manufacturers, it is expected to fully benefit from the efforts of domestic oil companies to strengthen exploration and development. According to the 13th Five-Year Plan of natural gas, the average annual growth rate of shale gas production in China is 46. 14%. At present, the main operating equipment of Fuling shale gas field is provided by petrochemical machinery, and domestic equipment manufacturers are more familiar with domestic geological structures and have leading technical strength. During the "Thirteenth Five-Year Plan" period, the construction of natural gas pipelines will be accelerated and major projects will be started gradually. Within five years, the pipeline length will increase by 62.5%, and the southern section of Sinopec's new Guangdong-Zhejiang pipeline project is expected to start this year, and the company is expected to fully benefit.

Harmo Technology (300084): the world's leading supplier of multiphase flow metering and production optimization solutions in oil fields, and the largest hydraulic end manufacturer of fracturing pumps in Asia.

Shen Kai Co., Ltd. (002278): Mainly engaged in the production and sales of four categories of products, such as drilling site measurement and control equipment, oil drilling well control equipment, oil production wellhead equipment, and petroleum product specification analysis instruments, with outstanding comprehensive service capabilities of products and integrated R&D and manufacturing capabilities of electromechanical instruments.

Tianke Co., Ltd. (600378): The company's pressure swing adsorption gas separation technology (PSA technology for short) is at the leading level in the world. As a leading enterprise in pressure swing adsorption gas separation industry, its domestic market share is about 40%-50%. This technology mainly recovers and purifies hydrogen, carbon monoxide, carbon dioxide, methane and other gases from industrial waste gas, which is one of the important technologies of low-carbon economy.

Cosl (60 1808): owns and operates the largest and most versatile large-scale equipment group in the market, which can serve the oilfield service market in the whole China sea area.

*ST Mo Long (002490): The company's products cover complete sets of drilling and production machinery and equipment and main key parts, and it is the only one-stop supplier of oil drilling and production equipment in China.

Jerry Co., Ltd. (002353): The company is mainly engaged in oil field special equipment manufacturing, oil field and mine equipment maintenance and renovation, spare parts sales and offshore oil field drilling and production platform engineering operation services.

CIMC (000039): The "Blue Whale 1", which undertakes this trial mining task, was designed and built by Raffles Company under CIMC.