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《NATURAL GAS INDUSTRY》 2000-02
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A RESEARCH ON THE MICROMECHANISM OF ACIDIZING REACTION ON SANDSTONES

Zhong Fuxun and He Wei(Geological Exploration and Development Research Institute of SPA)and He Chengzu and Feng Wenguang(Chengdu College of Technology).NATUR.GAS IND.V.20,no.2,pp.64~66,3/25/2000.(ISSN 1000 0976;In Chinese)  
The influence of acidizing reaction on the mineral composition and texture of the low permeability sandstone reservoirs in Sichuan Basin is examined according to the data on the thin section,scanning electron microscope,spectroscopic X ray diffraction and grain size analyses in the paper.The research results show that the acid etching effects on chlorite clay minerals in hydrochloric acid are related to the categories of second generation fillers;while the second generation fillers are the carbonates,illites and quartzs,their acid etching effects belong to the strong erosion,partial erosion and little erosion respectively;the etching effect of hydrofluoric acid on the detrituses and fillers in sandstone is changed with its efficient concentration;thin section analysis is conducive to designing a suitable acidizing fluid formulation which possesses high erosion efficiency and can cause the pore framework water to be destroyed;and the fair acid etching channels may be formed in sandstone through acidizing by hydrochloric acid.Finally,it is pointed out that some details of acidizing reaction mechanism are much more complex than what we had expected before,which contributes to optimizing acid stimulation in the future.
【Fund】: 中国石油天然气总公司“九五”重点科技工程项目
【CateGory Index】: P574
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