Numerical well test analysis of tight gas reservoirs basedon the three parameter nonlinear seepage

Ouyang Wei-ping, Zhang Mian, Liu Yue-wu, Wan Yi-zhao, Yuan Dong-rui, Li Shan-shan

doi:10.11764/j.issn.1672-1926.2016.11.2030

Natural Gas Geoscience >

2016 , Vol. 27 >Issue 11: 2030 - 2036

DOI: https://doi.org/10.11764/j.issn.1672-1926.2016.11.2030

Numerical well test analysis of tight gas reservoirs basedon the three parameter nonlinear seepage

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1.Changqing Downhole Technology Company,Chuanqing Drilling Engineering Co.Ltd.,CNPC,Xi’an 710018,China；
2.Postdoctoral Research Station,China University of Petroleum (Beijing),Beijing 102249,China；
3.Key Laboratory for Mechanics in Fluid Solid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

Received date: 2016-02-26

Revised date: 2016-04-01

Online published: 2019-09-09

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Abstract

The well testing models in low permeability reservoir are normally realized by using pseudo-linear flow equation with the average start-up pressure gradient.However,the pseudo-linear flow equation can only reflect the characteristics of start-up pressure gradient in low permeability reservoir.It cannot describe the characteristic of nonlinear flow.The three-parameter nonlinear seepage flow equation not only reflects the characteristics of the starting pressure gradient,also describes the non-linear concave curve.In order to improve the interpretation accuracy of the well test data in tight gas reservoir and perfect the nonlinear well testing theory,this paper presents a nonlinear numerical well testing model based on the three-parameter nonlinear seepage flow equation.With the model,the wellbore pressure response curves and pressure fields were obtained by using finite difference method.The characteristics of pressure response curves and pressure fields were analyzed.Effects of minimum start-up pressure gradient and average start-up pressure gradient on pressure response curves and pressure fields were studied.The results proved that the pressure derivative curves in radial flow phase deviating from the 0.5 line.The upward amplitude of pressure drop curves depends on the average start-up pressure gradient;the upward amplitude of pressure buildup curves depends on the difference between the average start-up pressure gradient and the minimum start-up pressure gradient.Response time of the out boundary depends on the minimum starting pressure gradient.

Key words： Tight gas reservoir; Nonlinear flow; Numerical well test; The minimum start-up pressure gradient; The average start-up pressure gradient; Pressure response curves

Cite this article

Ouyang Wei-ping, Zhang Mian, Liu Yue-wu, Wan Yi-zhao, Yuan Dong-rui, Li Shan-shan . Numerical well test analysis of tight gas reservoirs basedon the three parameter nonlinear seepage[J]. Natural Gas Geoscience, 2016 , 27(11) : 2030 -2036 . DOI: 10.11764/j.issn.1672-1926.2016.11.2030

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