Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (4): 178-188.doi: 10.12108/yxyqc.20240416

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles    

Water invasion performance and main controlling factors for edge-water gas reservoirs

QIN Zhengshan1, HE Yongming1, DING Yangyang1, LI Baihong2, SUN Shuangshuang1   

  1. 1. School of Energy, Chengdu University of Technology, Chengdu 610000, China;
    2. No. 6 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710000, China
  • Received:2022-11-26 Revised:2023-01-11 Online:2024-07-01 Published:2024-07-04

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Abstract: Based on classical fractional flow theory and gas-water percolation law，the fractional flow equation for edge-water gas reservoirs considering high-speed non-Darcy flow of gas phase was derived. The characteristic parameters and controlling factors of water invasion performance were analyzed based on the data of multiple water-producing gas wells in an edge-water gas reservoir in Sichuan Basin，and the technical approaches and strategies for delaying water invasion in gas reservoirs were discussed. The results show that：（1）The derived fractional flow equation can determine the overall advancement and breakthrough time of edge water in the reservoir（or gas well）at different development times，and the calculation results are more reliable than that by the traditional Darcy flow model.（2）The water invasion performance of the edge-water gas reservoirs is affected by a combination of multiple factors，the reservoir permeability has the most significant influence，followed by non-Darcy flow coefficient，relative permeability and porosity，while effective thickness，gas supply boundary and water invasion flow rate are less influential.（3）Fully exploiting the development potential of low-permeability and tight reservoirs with relatively uniform physical properties is the key to enhancing the development effectiveness of edge-water gas reservoirs，and formulating a reasonable gas recovery intensity is an important means to actively control and stabilize water.

Key words: fractional flow theory, water invasion performance, non-Darcy flow, entropy method, physical properties, effective thickness, gas supply boundary, water invasion flow rate, low-permeability and tight reservoir, gas recovery intensity, edge-water gas reservoir

CLC Number: 

  • TE312
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