A tri-linear model for production prediction in retrograde shale gas reservoirs

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  •  1.College of Petroleum Engineering,China University of Petroleum,Beijing 102249,China;2.CNOOC Research Institute,Beijing 100027,China

Received date: 2017-06-20

  Revised date: 2017-09-16

  Online published: 2017-11-10

Abstract

In this paper,a tri-linear model is used to make production forecasts for retrograde shale gas wells after hydraulic fracturing.Gas desorption,phase behavior and relative permeability of oil and gas are incorporated in it.Because of nonlinearity of mathematical model,pressure relative parameters are handled implicitly with pseudo-pressure and saturation relative parameters are handled explicitly.A flowing material balance method is proposed in this paper to obtain a semi-analytical solution of the model.By comparing the semi-analytical solution to the solution of commercial numerical simulator and field production data from a retrograde shale gas well located in Eagle Ford play,the accuracy and practicability of the proposed semi-analytical method is validated.The results show that the mathematical model can be linearized with the semi-analytical model.Under the same condition,the flow ability of retrograde shale gas is weaker than that of single-phase,fracturing stages should be more;the fracture length reflects the stimulated reservoir volume,increasing fracture length can improve the reserves of the well;secondary fracture density and permeability have a large effect on production,it is necessary to increase the complexity and conductivity of the stimulated reservoir.
 

Cite this article

Wu Yong-hui,Cheng Lin-song,Huang Shi-jun,Bai Yu-hu,Xu Bing-xiang,Ding Guan-yang . A tri-linear model for production prediction in retrograde shale gas reservoirs[J]. Natural Gas Geoscience, 2017 , 28(11) : 1745 -1754 . DOI: 10.11764/j.issn.1672-1926.2017.09.009

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