A triple-continuum pressure-transient model for a naturallyfractured vuggy reservoir

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We present an analytical approach for pressure transienttest analysis in naturally fractured vuggy reservoirs. This analysisapproach relies on a triple-continuum concept, using observed geologicaldata from carbonate oil formations in western China, to describetransient flow behavior in fracture-vug-matrix reservoirs. In theconceptual mathematical model, fractured vuggy rock is considered as atriple-continuum medium, consisting of fractures, rock matrix, and vugs(or cavities). Similar to the classical double-porosity model, thefracture continuum is assumed to be responsible for the occurrence ofglobal flow, while vuggy and matrix continua (providing primary storagespace) interact locally with each other as well as with globallyconnected fractures. Furthermore, the triple continua of ... continued below

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Wu, Y-S.; Ehlig-Economides, C.; Qin, Guan; Kang, Zhijang; Zhang,Wangming; Ajayi, Babatunde et al. August 28, 2007.

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We present an analytical approach for pressure transienttest analysis in naturally fractured vuggy reservoirs. This analysisapproach relies on a triple-continuum concept, using observed geologicaldata from carbonate oil formations in western China, to describetransient flow behavior in fracture-vug-matrix reservoirs. In theconceptual mathematical model, fractured vuggy rock is considered as atriple-continuum medium, consisting of fractures, rock matrix, and vugs(or cavities). Similar to the classical double-porosity model, thefracture continuum is assumed to be responsible for the occurrence ofglobal flow, while vuggy and matrix continua (providing primary storagespace) interact locally with each other as well as with globallyconnected fractures. Furthermore, the triple continua of fractures,matrix, and vugs are assumed to have uniform and homogeneous propertiesthroughout, and intercontinuum flows between them are at pseudosteadystate. With these assumptions, we derive analytical solutions in Laplacespace for transient flow toward a well in an infinite and finitereservoir with wellbore storage and skin effects. The analyticalsolutions reveal typical pressure responses in a fracture-vug-matrixreservoir and can be used for estimating vug properties, in addition tofracture and matrix parameters, through properly designed and conductedwell tests. As application examples, actual well test data from afractured-vuggy reservoir in Western China are analyzed using the triplecontinuum model.

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  • 2007 Society of Petroleum Engineers (SPE) AnnualTechnical Conference and Exhibition, Anaheim, California, U.S.A., 11-14November 2007

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  • Report No.: LBNL--63412
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 919032
  • Archival Resource Key: ark:/67531/metadc882660

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  • August 28, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 7, 2016, 11:21 p.m.

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Wu, Y-S.; Ehlig-Economides, C.; Qin, Guan; Kang, Zhijang; Zhang,Wangming; Ajayi, Babatunde et al. A triple-continuum pressure-transient model for a naturallyfractured vuggy reservoir, article, August 28, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc882660/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.