Influences of Microstructural Differences on Acid Corrosive Damage to Carbonate Rocks

doi:10.7657/XJPG20210209

Abstract

Abstract:

Experiments on acid-rock reaction rate, surface static corrosion and point-load mechanical strength were carried out to investigate the influences of mineral composition, microstructure and distribution of carbonate rock on acid-rock reaction rate, microstructure and mechanical strength. The results show that, at a constant mass fraction of HCL, the reaction rate between limestone and HCL is directly related to the carbonate content. The higher the carbonate content is, the faster the acid-rock reaction rate and the more intense the reaction will be. Since there are differences in the mineral compositions between the matrix in the fracture zone and the fillings in the fractures, the porosity of the matrix is quite different from that of the fractures, so that acid would erode the mineral compositions along the fractures, resulting in grooves. The damages to the matrix of limestone by acid can induce fractures and extend to natural fractures, and consequently local damage occurs. With the increase of the times of acid dropping, the mechanical damage coefficient of the matrix in limestone would be greater than that of the fracture zone, and the limestone matrix transforms from brittle to ductile.

Key words: carbonate rock, acid-rock reaction, microstructural difference, damage mechanism, limestone matrix, fracture zone

CLC Number:

TE311

LI Xinyong, WU Hengchuan, FANG Haoqing, LI Yongshou, MAO Haijun, HUANG Luyun. Influences of Microstructural Differences on Acid Corrosive Damage to Carbonate Rocks[J]. Xinjiang Petroleum Geology, 2021, 42(2): 188-193.

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