Study on Flow Characteristics of Multiple Coupled Model in Shale Gas Reservoirs

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  • School of Petroleum Engineering,China University of Petroleum,Qingdao 266580,China

Received date: 2015-03-27

  Revised date: 2015-06-17

  Online published: 2015-12-10

Abstract

Gas flow in shale reservoir is affected by the interaction of desorption,diffusion,seepage mechanisms and formation stress sensitivity.Based on the trilinear model,a composite flow model for multistage fractured horizontal well was established with consideration of multiple mechanisms,which can reflect the characteristics of stimulation and fluid flow in shale gas reservoirs.Applying Laplace transform and Stehfest numerical inversion,the semi-analytical solutions of non-dimensional bottom-hole pseudo-pressure and productivity in closed reservoir were obtained.The analysis of gas flow in multi-scale porosity and the effects of different factors on productivity were carried out.The presented model was validated by the production data of gas well in North America.The results show that gas adsorption results in an obvious “dip” in pressure response curves.The larger desorption coefficient is,the higher desorption gas and production are.The larger channeling factor is,the earlier fluid exchange between matrix and fracture appears but the shorter it lasts.Larger stimulated volume would increase formation conductivity,while an optimistic value exists due to the fractures interference.The limited stimulated bandwidth are more accord with the practice by comparing matching results.The presented model and results enrich the pressure and rate analysis model for the multistage fractured horizontal wells in shale reservoirs.

Cite this article

SU Yu-liang,ZHANG Qi,ZHANG Min,WANG Wen-dong . Study on Flow Characteristics of Multiple Coupled Model in Shale Gas Reservoirs[J]. Natural Gas Geoscience, 2015 , 26(12) : 2388 -2394 . DOI: 10.11764/j.issn.1672-1926.2015.12.2388

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