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On March 15, as the gas supply valves of each gas storage depot were closed one after another, the winter supply task of PetroChina's gas storage was successfully completed
After nearly 30 years of exploration and research, China's gas storage construction technology level led by PetroChina has ranked among the top in the world
Overcoming difficult problems, gas storage capacity jumped to the top ten
Overcoming difficult problems and gas storage capacity jumped to the top tenIn 2009, a cold snap hit the north and south of our country
"After more than 100 years of development, foreign gas storages have various types and complete systems, providing valuable reference experience for China
"Turn the disadvantage into an advantage and overcome the world's problems, and we can achieve 'overtaking on a curve'
At present, PetroChina has built 24 gas storage depots and is building a batch of new ones.
Facing challenges and forming four characteristic technologies
Facing challenges and forming four characteristic technologies Facing challenges and forming four characteristic technologiesWith the rapid growth of China's natural gas consumption, insufficient gas storage capacity has further aggravated the contradiction between the safe and stable supply of natural gas, and China's natural gas dependence on foreign countries is as high as 44%
Faced with the world-class problem of building complex fault blocks, medium-low permeability near-depleted gas reservoirs in China, the joint team of PetroChina gas storage has formed four characteristic comprehensive technologies for building storage
The first is to innovate the key theories and methods for building complex fault-block gas reservoirs such as dynamic sealing of gas storage and high-speed injection-production seepage, creating world records such as the deepest burial, the highest operating pressure, and the largest bottom-hole pressure difference; the second is to deplete gas reservoirs The technologies such as drilling and plugging in ultra-low pressure formations of gas storage, anti-crack cementing with alternating load, and design of injection-production pipe string under alternating conditions are basically mature, which supports the large-scale construction of domestic gas storage and gas storage; Displacement reciprocating gas injection compressor unit breaks the monopoly of imports; fourth, establishes a safety management and control system for the whole life cycle, and develops safety testing equipment such as downhole leak detection and helium seal detection of injection and production strings, whose performance has reached the level of similar foreign products
At the same time, breakthroughs have been made in the single-cavity construction technology of vertical wells in complex multi-interlayer low-grade salt layers, and the first Jintan salt-cavern gas storage in Asia has been built, providing technical support for the scale construction of salt-cavern gas storage in China
The compressor is known as the "heart" of the gas storage
The deepest gas storage well in the world and the highest pressure are in China, which imposes strict requirements on cementing cement
Jointly tackle key problems to ensure national energy security
Joint research to ensure national energy security Joint research to ensure national energy securityDuring the "14th Five-Year Plan" period, China proposed an overall plan to accelerate the construction of underground storage, and determined that "the national intensive gas storage capacity will exceed 50 billion cubic meters in 2025, 60 billion cubic meters in 2030, and 70 billion cubic meters in 2035.
To this end, PetroChina, led by the Exploration Institute, relies on 7 gas storage construction units including the Gas Storage Branch, and cooperates with scientific research institutes and enterprises such as the PetroChina Engineering Technology Research Institute, focusing on the company's in-service warehouse capacity, new warehouse construction, and safety management and control.
In response to the problem of reservoir construction, the research team carried out evaluation and research on the site selection of reservoir construction, screened a number of reservoir site resources, and carried out research on supporting technologies for reservoir construction; Exploring new technologies; striving for new breakthroughs; aiming at the problem of gas storage in complex and connected salt caverns, the research team has developed multi-well technology and multi-gas storage space utilization technology
In addition, the CNPC underground gas storage technology research team took the lead in applying for the National Energy Underground Gas Storage R&D Center