Subdivision of strongly heterogeneous carbonate gas reservoir and technical countermeasures in different production stages: Case study of Sinian in Sichuan Basin
CAI Jun-jun,1, PENG Xian1, LI Qian1, ZHAN Tian-hui1, ZHU Zhan-mei1, LI Wen1, GAN Xiao-fei2, DENG Zhuang2, WANG Jia-shu2
1.Exploration and Development Research Institute,PetroChina Southwest Oil & Gas Field Company,Chengdu 610051,China
2.Central Sichuan Division,PetroChina Southwest Oil & Gas Field Company,Suining 629000,China
The Sinian Dengying Formation gas reservoir in Sichuan Basin is an ancient, deep, low-porosity and strongly heterogeneous karst carbonate gas reservoir. Due to the limitation of the existing industry standards on reservoir types, the response of dynamic and static data can not be one-to-one correspondence. Therefore, based on the static data, the reservoir of Sinian Dengying Formation gas reservoir in Sichuan Basin was subdivided into two stages from the perspective of development, the dynamic response of various reservoirs were clarified, and the technical countermeasures for gas wells in different production stages of different types of reservoirs are formulated. The technical countermeasures include:(1) The production organization strategies for five types of reservoirs are defined,i.e. the strategy of high production and high pressure should be implemented for fractured-vuggy I and porous-vuggy I,the ratio of porous-vuggy I is optimized to 1/4-1/3;the strategy of low production and low pressure should be implemented for fractured-vuggy II,porous-vuggy II and pore I,the ratio of fractured-vuggy II is optimized to 1/12-1/10. According to this strategy, the gas wells with established reservoir type should be optimized and the production flow sections should be divided and the early dynamic reserve evaluation should be carried out. (2) For those that have been put into production but the reservoir type is not clear, it is necessary to evaluate whether the production of gas wells is stable,preliminarily determine the reservoir type,carry out dynamic monitoring, implement reservoir subdivision types, and optimize gas well production allocation according to countermeasures (1). (3) For production building wells, they should be divided into different types according to static data after oil testing, and production allocation should be designed according to the scheme after production. Dynamic data should be accurately enrolled to prepare for the determination of reservoir types. The research results provide an effective support for the upper production of Dengying Formation gas reservoir and the long-term stable production of 60×108 m3/a scale.
CAI Jun-jun, PENG Xian, LI Qian, ZHAN Tian-hui, ZHU Zhan-mei, LI Wen, GAN Xiao-fei, DENG Zhuang, WANG Jia-shu. Subdivision of strongly heterogeneous carbonate gas reservoir and technical countermeasures in different production stages: Case study of Sinian in Sichuan Basin. Natural Gas Geoscience[J], 2021, 32(6): 851-860 doi:10.11764/j.issn.1672-1926.2020.12.002
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