Experimental investigation of pore-permeability characteristics change caused by salt precipitation in tight sandstone gas reservoirs

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  • State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China

Received date: 2017-08-06

  Revised date: 2018-05-14

  Online published: 2018-08-29

Abstract

Salt precipitation and its induced problems are increasingly prominent with the development of deep and ultra-deep tight sandstone gas reservoirs with high salinity formation water.In this paper,the change of porosity and permeability of a series of tight sandstone was measured,and then the morphology and occurrence state of crystalloid salt within the pore was observed by SEM.Meanwhile,the changes of pore size distribution were analyzed by high-pressure mercury injection.Experimental results show that salt precipitation has a great effect on the porosity and permeability,which decrease by 53% and 65% after salt precipitation,respectively.The occurrence state of the crystalloid salt can be divided into three models:Superposition growth along with the intergranular pore-fractures/natural micro-fractures,lamellar growth attached to the surface of the hydrophilic mineral like I/S interstratified mineral and the individual particles located in the corner of pore.When the size of crystalloid salt is closer to the pore size distribution of tight sandstone,it is easier to cause cracks and pore throat blockage.It is suggested that salt wash pretreatment should be carried out before analysis of tight sandstone with porosity less than 5%.

Cite this article

You Li-jun, Wang Zhe, Kang Yi-li, Zhang Du-jie . Experimental investigation of pore-permeability characteristics change caused by salt precipitation in tight sandstone gas reservoirs[J]. Natural Gas Geoscience, 2018 , 29(6) : 866 -872 . DOI: 10.11764/j.issn.1672-1926.2018.05.001

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