Unsteady productivity model of elliptical flow in fracturing triple medium gas reservoir

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  • 1.School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China; 2.CNOOC Research Institute Co. Ltd.,Beijing 100028,China

Received date: 2018-09-22

  Revised date: 2018-12-21

  Online published: 2019-04-01

Abstract

The stimulated reservoir volume(SRV) is generated after hydraulic fracturing,and the gas reservoir properties in SRV are different from those in original formation.SRV can be simplified to an elliptical shape region around hydraulic fracture at each stage of hydraulic fracturing.Since the triple medium gas reservoir is an anisotropic formation,compared to classical radial flow model,the elliptical flow model is essential for the optimal development of triple medium gas reservoirs.A new composite elliptical flow model of fracturing wells is established to analyze the production performance of triple medium gas reservoirs considering SRV.The inner and outer elliptical regions of the model both are triple media,and the inner region with high flow capacity is used to characterize SRV.The cross flow between matrix and fractures is considered as unsteady flow.The elliptical flow model is solved using the Mathieu function,Laplacian variation and Stehfest numerical inversion algorithm.The dimensionless typical curves are plotted and the model is verified.According to the characteristics of type curves,there are thirteen flow regimes.The unsteady cross flow between matrix and fractures is compared with the pseudo-steady cross flow.The influences of relevant parameters on productivity are analyzed,such as wellbore radius,SRV radius,mobility ratio and storativity ratio.

Cite this article

Jiang Rui-zhong, Zhang Fu-lei, Gao Yi-hua, Cui Yong-zheng, Shen Ze-yang, Yuan Jian-wei . Unsteady productivity model of elliptical flow in fracturing triple medium gas reservoir[J]. Natural Gas Geoscience, 2019 , 30(3) : 370 -378 . DOI: 10.11764/j.issn.1672-1926.2018.12.014

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