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A new productivity calculation method of fractured gas well in low permeability gas reservoir

Yang Hao-long,Xiang Zu-ping,Yuan Ying-zhong,Li Long   

  1. 1.School of Petroleum Engineering,Chongqing University of Science & Technology,Chongqing 401331,China;
    2.Southwest Oil& Gas Field Company,PetroChina,Chengdu 610051,China
  • Received:2017-04-17 Revised:2017-11-14 Online:2018-01-10 Published:2018-01-10

Abstract:

The low permeability gas reservoirs account for large proportion in gas reservoir exploration and development of China.The low permeability gas reservoir has the characteristics of low permeability and low porosity,which makes it difficult to obtain commercial development directly.So it is necessary to improve the development by fracturing.A large number of experimental studies have testified the existence of threshold pressure gradient,slippage effect,stress sensitivity and high velocity non Darcy flow.At present,most of the productivity researches of low permeability fractured gas wells are mainly based on a single factor,and the study of multiple factors is relatively small.According to the changes of fluid seepage law of gas wells after fracturing,using the fluid mechanics theory of gas reservoirs,a new steady-state productivity calculation method of fractured gas well has been established,which considers threshold pressure gradient,slippage effect,stress sensitivity and high velocity non Darcy flow.An example of a low permeability gas reservoir is analyzed by using the new method and the new method is proved to be reliable.The results show that the threshold pressure gradient and stress sensitivity will reduce the gas well productivity,the stress sensitivity is greater;the slippage effect will reduce productivity slightly in the low pressure stage;we should pay attention to control the production pressure difference to maintain a moderate stable production in the low permeability gas reservoir development.
 

Key words: Low permeability gas reservoir, Fractured gas wells, Threshold pressure gradient, Slippage effect, Stress sensitivity, High velocity non Darcy flow, Productivity

CLC Number: 

  • TE328

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