Production decline rule and recoverable reserves prediction of TY water-bearing shale gas reservoir
Water-bearing shale gas reservoirs have the characteristics of rapid production decline and large energy consumption.This paper firstly put forward three types of indicators representing the changes of productivity,water production and production efficiency of shale gas reservoirs combining with shale gas reservoirs production process theoretical research,and analyzed the production dynamic change characteristics of water-bearing shale gas reservoirs in different production stages.Based on the comparison of different production decline analysis methods of shale gas reservoirs,a production decline prediction model that described the whole production process of water-bearing shale gas reservoirs was established.Using the principle of conservation of production-energy replacement under depletion development condition,a recoverable reserves prediction method based on the relationship between cumulative gas production and cumulative energy consumption was proposed,whose applicability was analyzed.The research results show that the method can predict the production decline laws and recoverable reserves of water-bearing shale gas reservoirs comprehensively and accurately,providing technical support for the rational development of such gas reservoirs.
shale gas reservoirsproduction characteristicsdecline lawspressure energy consumptionrecoverable reserves
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