【Ten Years of Rapid Development in Chemical Engineering Equipment】Commissioning of the First Pilot Project for Complex Fractured-Cave Carbonate Rock Gas Storage Fields from 1250 to 2023

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Looking at the development of chemical technology over the past decade, we praise the prosperity and strength of modern China. This is just a starting point to encourage further participation from everyone; with you here, Haichuan becomes even more wonderful. On November 8, 2023, the daily gas injection capacity of the Moujiaping and Laowengchang gas storage facilities in the Shunan Gas Field of Southwest Oil and Gas Field Company reached 1.3 million cubic meters. Thus, the country’s first pilot project for a complex fracture-dome type carbonate rock gas storage field has been fully put into operation, marking a significant breakthrough in the key core technologies related to such gas storage fields in China. 　　The Mujiaping and Laowengchang gas storage complexes are located in Changning County, Yibin City, Sichuan Province. Once fully built, their maximum daily gas production capacity will exceed 50 million cubic meters, enabling supply for seasonal demand regulation and emergency purposes in the Sichuan-Chongqing region as well as across the country. 　　Compared with other types of gas reservoirs, complex fracture-dome carbonate rock gas reservoirs have advantages such as high well productivity, large storage capacity, and minimal impact from water intrusion. However, the technology required for developing such reservoirs is highly challenging, as they face various difficulties including strong stratigraphic heterogeneity, multiple media, extremely low reservoir pressures, and numerous fault systems. Precise characterization of the gas reservoirs, determination of well locations, understanding of flow mechanisms, and design of reservoir capacity all present significant challenges, making these reservoirs a technical bottleneck that is difficult to overcome both domestically and internationally. 　　To this end, the Southwest Oil and Gas Field has developed an innovative technique for the quantitative characterization of flow delay in high-speed injection and production in multi-media systems, providing a basis for evaluating the injection and production capacity of individual wells as well as for designing reservoir capacity parameters ； A detailed characterization technique for multi-scale karst fracture and cavity reservoirs was developed, which for the first time clarified the production capacity and flow characteristics of gas wells under the conditions of depletion in fracture and cavity-type gas reservoirs, providing a basis for identifying favorable areas for reservoir development and determining well locations ； Develop large-diameter well directional drilling technology integrated with geological engineering to achieve efficient drilling of low-pressure fracture-cave type gas reservoirs ； A geomechanical stability assessment technique featuring a two-way coupling between a geomechanical model and a numerical simulation model is developed to evaluate the deformation risk of the geological formations involved in gas injection and extraction in gas storage facilities. These four key core technologies fill the technical gaps in complex fracture-cave-type carbonate rock gas storage facilities both domestically and internationally, reaching a leading level in China.