Development countermeasures for bottom-water gas reservoirs
Bottom-water gas reservoirs play an important role in China's natural gas exploration and development.However,these res-ervoirs differ greatly in tectonic and physical properties,with complex gas-water relationships,as well as unpredictable water invasion patterns,leading to the limitations of conventional development countermeasures,which impede the development of bottom-water gas reservoirs.In this paper,development practices of bottom-water gas reservoirs at home and abroad were investigated.These reservoirs were compared for geological and tectonic features,and analyzed for water invasion patterns and development effects.Finally,the development countermeasures were summarized for bottom-water gas reservoirs with different reservoir and infiltration types in dif-ferent development stages.The results are shown as follows:(ⅰ)Carbonate bottom-water gas reservoirs commonly contain developed fractures,and they are mainly fractured-porous and fractured-vuggy reservoirs,while clastic bottom-water gas reservoirs are common-ly observed with localized microfractures,and they are mostly porous reservoirs.(ⅱ)Bottom-water gas reservoirs with different res-ervoir and filtration types are distinct in water invasion patterns,so the development countermeasures should be customized for target gas reservoir depending on its characteristics.(ⅲ)Bottom-water gas reservoirs in different development stages correspond to specific water control objectives:in the early stage,the parameters of development countermeasures are optimized and the best completion method is selected to prolong the water-free production period;in the middle stage,single-well water drainage,plugging,and blocking are implemented to mitigate the water production of gas wells;and in the late stage,the development countermeasures are determined with the objectives of restoring the producing geological reserves and resuming the recovery of water-flooded wells.The research re-sults provide references for the development of bottom-water gas reservoirs.
Bottom-water gas reservoirReservoir-infiltration characteristicsDevelopment effectWater invasion patternDevelop-ment countermeasureWater control measure
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