A numerical well test model for wells drilled out of big-size cavity of fractured carbonate reservoirs

  • CHEN Fangfang ,
  • ZHANG Fuxiang ,
  • DENG Xingliang ,
  • ZHU Yongfeng ,
  • YUAN Yuchun ,
  • MA Xiaoping
  • Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China

Received date: 2014-12-12

  Revised date: 2015-02-02

  Online published: 2015-05-15


Conventional continuous multiple medium theories are not suitable for describing the fractured-cavernous carbonate reservoir with big-size fractures and caves. An interpretation model for well test of naturally fractured vuggy reservoir has been developed with consideration of wells drilled outside a big cavity. The model equations are solved with the finite-element method. The analysis of the affecting factors of dynamic pressure at well bottom indicates that the pressure derivative curve of the late stage will go down and form a concave because of the high permeability of the cave. The scale and permeability of the cave mainly affect the amplitude of the pressure derivative reduction. The predicted model has a good agreement with the field test. This can provide a theoretical basis and guidance for well test interpretation of carbonate reservoir.

Cite this article

CHEN Fangfang , ZHANG Fuxiang , DENG Xingliang , ZHU Yongfeng , YUAN Yuchun , MA Xiaoping . A numerical well test model for wells drilled out of big-size cavity of fractured carbonate reservoirs[J]. Science & Technology Review, 2015 , 33(9) : 46 -49 . DOI: 10.3981/j.issn.1000-7857.2015.09.007


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