Research on the Trial Production Characteristics and Production Allocation of Gas Wells in the Gas Reservoir of Deng 2 Member with Bottom Water:A Case Study of Gas Reservoir of GS1 Well Block,Anyue Gas Field
The second member of Dengying Formation in the GS1 well area of Anyue Gas Field in the Sichuan Basin is a large scale,low-magnitude,wide flat structure gas reservoir.The gas reservoir has strong heterogeneity,facing the risk of bottom water advancing high angle fractures and cavities during the development process.This paper establishes a water invasion risk zone classification through comprehensive research on gas reservoir charac-teristics,reservoir percolation characteristics,and well area trial production dynamic characteristics,reservoir distri-bution,and gas water contact relationships.A water invasion mechanism model is established for different risk zones,and numerical simulations are conducted to predict and summarize the regional water invasion mode.Based on the research of typical fractured-vuggy bottom water gas reservoirs at home and abroad,a reasonable range of gas production rate of 1.5％to 3％is designed,with the aim of extending the waterless gas production period and ensuring long-term stable production.The production allocation of gas wells in four types of water invasion risk areas ranges,effectively guiding the development and production of gas reservoirs,providing useful guidance for the development and production of similar fractured-vuggy type bottom water gas reservoirs.
bottom water reservoirwater invasionmechanism modelreasonable production allocation
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