A productivity model of volume fractured horizontal wells in shale gas based on the continuous succession pseudo-steady state method

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  • 1.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation in Southwest Petroleum University,Chengdu 610500,China;
    2.No.12 Oil Production Plant,Changqing Oilfield Company,Xi’an 710200,China; 
    3.CNPC Southwest Oil and Gas Field Company,Chengdu 610017,China

Received date: 2018-01-03

  Revised date: 2018-06-02

  Online published: 2019-08-28

Abstract

The volume fractured horizontal well is the key technology for developing shale gas reservoirs.After the stimulated reservoir volume is fractured,the gas flow in matrix is non-linear seepage controlled by the nano-scale pores,while the seepage in stimulated region is converted into Darcy flow controlled by the micro-scale fracture network.In this paper,the steady productivity model of volume fractured horizontal well was firstly established by comprehensively considering the multi-scale flowing states,shale gas desorption and diffusion,which coupled flows in matrix and stimulated region.On this basis,for the first time,a transient productivity calculation model combined with the material balance equation was obtained with the continuous succession pseudo-steady state method (SPSS),which considered the unstable propagation of pressure wave.And the horizontal well productivity prediction and factors analysis was carried out by using the SPSS.The results show that the model has the advantages of simple process,fast calculation speed and high agreement with numerical simulation results.Furthermore,it can be found that the seepage of shale gas is an unstable process.The pressure wave first reaches the boundary of the stimulated region,and then propagates to the reservoir boundary.During the production process,the desorption effect of shale gas is the key factor affecting the middle and late stage production of gas wells.With the increase of the radius and permeability of the stimulated region,the diffusion coefficient and Langmuir volume,the productivity of shale gas wells would increase,while the increasing rate would decrease.And the effect of Langmuir pressure on productivity is less.It is concluded that this method provides a theoretical basis for the calculation of transient productivity of shale gas fractured horizontal wells.

Cite this article

Zeng Fan-hui, Wang Xiao-wei, Guo Jian-chun, Zheng Ji-gang, Li Ya-zhou, Xiang Jian-hua . A productivity model of volume fractured horizontal wells in shale gas based on the continuous succession pseudo-steady state method[J]. Natural Gas Geoscience, 2018 , 29(7) : 1051 -1059 . DOI: 10.11764/j.issn.1672-1926.2018.06.003

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