Study on the effect of gas-shale reservoir special propertieson the fracturing fluid recovery efficiency and production performance

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  • 1.Key Laboratory for Petroleum Engineering of the Ministry of Education,China University
    of Petroleum,Beijing 102249,China;2.PetroChina Research Institute of Petroleum Exploration &
    Development-Langfang,Langfang 065007,China;3.International Mudlogging Departmentof Great Wall Drilling Company(GWDC),China National Petroleum Company,Beijing 100101,China

Received date: 2016-12-12

  Revised date: 2017-03-02

  Online published: 2017-06-10

Abstract

Compared with the conventional reservoir,the complicated property of gas-shale reservoir has a more significant influence on fracturing fluid recovery efficiency(RE) and production performance(PP).A numerical simulation model about early gas-water two-phase flow is established based on the typical data to study the effects of reservoir properties on RE and PP,such as subirreducible water saturation,relative permeability jail,wettability and matrix capillary force.The results,firstly,show that more fluidsareimbibed into the reservoir because of “subirreduciblewater saturation”,resulting in the larger water saturation increment,the higher initial gas production and the lower RE.However,the water saturation of matrix is still higher after 10 days shut-in if the original water saturation is higher at first causing less gas is produced in late stage.Secondly,the cumulative gas production(CGP) decreases with the severity of the “relative permeability jail”,in which the CGP is only 1.32×104m3 after 3 years production.Fewfluid is recovered(4.74%) if a conventional relative permeability is applied.Therefore,the weak relative permeability jail curve is more suitable for the tight reservoirs than other two types of relative permeability curves.What's more,the weak water wet formation reduces the imbibition and replacement leading to the decrease of CGP and the increase of RE.Finally,with the increase of capillary pressure,the higher gas production in early stage and the lower in late stage are revealed because of gas permeability impaired by high water saturation caused by the strong imbibition,resulting in lower CGP and combined with lower RE.

Cite this article

Zhang Tao,Li Xiang-fang,Wang Yong-hui,Shi Jun-tai,Yang Li-feng,Sun Zheng,Yang Jian,Zhang Zeng-hua . Study on the effect of gas-shale reservoir special propertieson the fracturing fluid recovery efficiency and production performance[J]. Natural Gas Geoscience, 2017 , 28(6) : 828 -838 . DOI: 10.11764/j.issn.1672-1926.2017.05.003

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