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《Petroleum Geology and Recovery Efficiency》 2010-01
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A microcosmic experimental study on acidulation of low permeability sandstone filled with goeschwitzites——a case of Xujiahe Formation,certain gasfield,Central Sichuan

Wang Ying.Tang Hongming.Yang Haibo et al Research Institute of Geological Exploration and Production,Chuanqing Drilling Engineering Co.,Ltd..Petro China,Chengdu City,Sichuan Province,610051,China  
By means of lithologic instrumentations of SEM (Scanning Electron Microscope),the conventional acid-sensitivity experiments and acid effect of the low permeability sandstone reservoirs filled with goeschwitzites were analyzed in Xujiahe Formation,cer-tain gasfield,Central Sichuan.The variation of microcosmic structural feature of the goeschwitzites before and after acid flow-ing experiments was compared systematically.Normal experiments show that the acid-sensitivity of HC1 is moderate or strong,and mud acid is strong.Crystal forms of the goeschwitzites have little change after HC1 acidulation;but have various degree corrosion after mud-acid acidulation,which mainly divided into three conformations.The first,the flaky goeschwitzites with half filled pore collapsed after corrosion,clinged on the rock particles,and swelled reservoir pore volumes;the second,crystal bodies suffered partial corrosion,and the crystal forms were vagueithe third,the particulate matters after acidation ad-hered to the surface of goeschwitzites.Original texture of the cores was destroyed after mud acid acidulation.Through testing the parameters of pore structures by Capillary Flow Porometer(PMI).the effective throat size of the reservoir is not improved obviously after acidation.
【Fund】: 中国石油天然气集团公司中青年科技创新基金项目(06E1019);; 四川省教育厅青年基金项目(2006B061)
【CateGory Index】: P618.13
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