From July 23 to July 24, CNPC organized a group of experts to study the key technologies for the development of natural gas in the major scientific and technological projects jointly undertaken by the Exploration and Development Research Institute, Southwest Oil and Gas Field, Daqing Oilfield, Xinjiang Oilfield and Nanfang Company. An interim assessment was conducted. The Group believes that significant progress has been made in the research on key technologies for the development of China's oil and natural gas and theoretical and technological innovations, which has played a strong scientific and technological support for the rapid development of the Company's natural gas development business and the construction of "Beautiful China." The project mainly focuses on the application of basic research and key technologies in the gas production of new natural gas areas and the stable production of old areas. The project has been focused on improving gas recovery, gas reservoir description and simulation, reservoir modification and gas production, Development of the law and development planning and achieved major innovations, developed 5 sets of equipment and 2 sets of fracturing fluid system, research and development of 7 sets of software, declared 12 invention patents, 5 authorized, formulated 2 standard specifications, published 5 monographs , Published 68 papers. The major progress and innovation achievements of the project mainly include four aspects. Firstly, a new physical simulation experiment of gas seepage in low permeability and tight core was established. The basic theory and experimental research on enhanced oil recovery in gas field were systematically carried out. The mechanism of enhancing oil recovery by injecting carbon dioxide and nitrogen into the condensate reservoir was deeply studied. The new recognition of gravity differentiation and dry gas over injection gas composition provides important theoretical guidance for enhancing oil recovery in Yaha and Huafa fields. The second is the formation of gas detection integrated seismic acquisition / processing / prediction technology, innovation and development of volcanic rocks and other complex reservoir characterization and prediction techniques, the establishment of a new gas reservoir description of the norms and technical processes, the successful application of Sulige, Xujiahe, Changling, Xu Shen, Kelameili gas field development. Thirdly, a series of tools such as drillable bridging plug, open-hole packer, high-pressure gas lift valve, drainage gas recovery and so on were developed. They are gas wells and shale gas reservoirs reconstruction in old gas fields in Sichuan and development of difficult reserves in volcanic gas reservoirs Provided technical means. Fourth, in-depth study and clarification of the laws governing the development of three major gas fields, including high-pressure gas fields, large-scale low-permeability gas fields, and carbonate gas fields, and innovative development of a natural gas development planning software system provided a new and long-term strategic and scientific decision for the development of natural gas business Technical means. Next, the project team will closely focus on major technological needs for natural gas development, further strengthen R & D and fully integrate the Company's major innovation achievements in natural gas exploration technology to form a complete theoretical system of natural gas exploration and provide a strong scientific and technological support for the rapid development of natural gas of the Company .