Production forecasting model of shale gas considering the main fractures

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  • 1.Research Institute of Shaanxi Yanchang Petroleum(Group) Co. Ltd.,Xi’an 710075,China; 2.New Energy Research Center,CNOOC Research Institute,Beijing 100028,China; 3.Production Logging Center,China Petroleum Logging Co. Ltd.,Xi’an 710201,China

Received date: 2018-05-23

  Revised date: 2018-11-16

  Online published: 2019-03-11

Abstract

The complexity of fracture geometry for multi-stage fractured horizontal well increases the difficulty in predicting shale gas productivity.Based on the assumption that the fracture geometry includes main fractures and complex fracture network system,the tri-porosity linear flow model for shale gas multi-stage fractured horizontal well considering the main fractures is established.The Laplace space solution is obtained by dimensionless treatment and Laplace transformation,then the new type curves are drawn by programming calculation,which shows that both the main fractures and the fracture network contribute the fracture linear flow.Compared with the dual-porosity model,the tri-porosity model increases the main fractures system that not only determines the seepage flow pattern in shale reservoir,but also affects the production of shale gas well.Analysis of the effect of the main fracture system on the shale gas production shows that: Firstly,the fracture half-length xF affects each flow stage,the lager the xF is,the higher the production is,the sooner the flow reaches the boundary.Besides,the fracture width w affects fracture linear flow stage and transitional flow stage,the larger the wF is,the higher the production is,but the fracture linear flow duration isconstant,and the duration of transitional flow is shortened.At last,the effect of xF on productionis greater than wF.The tri-porosity model can not only guide shale gas well fracturing operation,but also provide a productivity prediction and analysis method for multi-stage fractured horizontal well with main fractures,and improve the accuracy of production prediction.


Cite this article

Zhang Lei, Xu Bing-xiang, Xin Cui-ping, Qiao Xiang-yang, Mu Jing-fu, Xu Yang, Han Chang-chun . Production forecasting model of shale gas considering the main fractures[J]. Natural Gas Geoscience, 2019 , 30(2) : 247 -256 . DOI: 10.11764/j.issn.1672-1926.2018.11.009

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