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.
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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