Corrosion and degradation of feldspar sandstone in acidic environment

Authors

ZHOU Bin, State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
ZHANG Dongming, State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
XU Jiang, State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
CHENG Liang, State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
LI Jiaxin, ICT Research Center, Chongqing University, Chongqing 400030, China

Abstract

In order to study the effect of acidic environment on the corrosion and deterioration of rocks, CT images processing technology was used to analyze the meso-composition and structural changes of feldspar sandstone after soaking in acidic water. Shimadzu AGI-250 servo material testing machine was used to carry out uniaxial compression test to observe the deterioration of mechanical parameters. The results show that the total density of the feldspar sandstone decreased Ofter the acidic environment treatment, the distribution trend is homogeneous, and the mineral with higher density is formed in the local area. The secondary pores of the feldspar sandstone increased after the acidic environment treatment. The change of the external pore could be seen directly. The internal pores changes could be directly reflected by the minimum circumscribed rectangle area. The maximum decrease in compressive strength, elastic modulus, and peak strain of feldspar sandstone treated in acid water reached 34.092%, 22.016%, and 13.705% respectively. The degradation degree of the strength parameters was higher than that of the deformation parameters. When there was sufficient H⁺ in acidic water, the dissolution reaction of sandstone in acidic solution was mainly. After the H⁺ was reduced to a certain extent, orthoclase and plagioclase dissolved, and other authigenic minerals could be formed. When H⁺ was consumed, the reaction proceeded mainly by hydrolysis. By applying the combination of CT images processing technology to the mechanism analysis of mechanical properties of sandstone after acid environment treatment, a new idea and method for studying the composition and properties of heterogeneous materials such as rock is provided.

Keywords

feldspar sandstone, acidic environment, CT images processing, mechanical properties, deterioration law

DOI

10.3969/j.issn.1001-1986.2020.04.023

Recommended Citation

ZHOU Bin, ZHANG Dongming, XU Jiang, et al. (2020) "Corrosion and degradation of feldspar sandstone in acidic environment," Coal Geology & Exploration: Vol. 48: Iss. 4, Article 24.
DOI: 10.3969/j.issn.1001-1986.2020.04.023
Available at: https://cge.researchcommons.org/journal/vol48/iss4/24

Reference

[1] MIAO Shengjun,CAI Meifeng,GUO Qifeng,et al. Damage effects and mechanisms in granite treated with acidic chemical solutions[J]. International Journal of Rock Mechanics and Mining Sciences,2016,88:77-86.

[2] 刘新荣,李栋梁,王震,等. 酸性干湿循环对泥质砂岩强度特性劣化影响研究[J]. 岩石力学与工程学报,2016,35(8):1543-1554. LIU Xinrong,LI Dongliang,WANG Zhen,et al. The effect of dry-wet cycles with acidic wetting fluid on strength deterioration of shaly sandstone[J]. Chinese Journal of Rock Mechanics and Engineering,2016,35(8):1543-1554.

[3] 杨俊杰,黄月明,张文正,等. 乙酸对长石砂岩溶蚀作用的实验模拟[J]. 石油勘探与开发,1995,22(4):82-86. YANG Junjie,HUANG Yueming,ZHANG Wenzheng,et al. Experimental approach of dissolution of feldspar sandstone by acetic acid[J]. Petroleum Exploration and Development,1995,22(4):82-86.

[4] LI Ning,ZHU Yunming,SU Bo,et al. A chemical damage model of sandstone in acid solution[J]. International Journal of Rock Mechanics and Mining Sciences,2003,40(2):243-249.

[5] 张梁. 酸性环境干湿交替作用下泥质砂岩宏细观损伤特性研究[D]. 重庆:重庆大学,2014. ZHANG Liang. Study on Macro-Meso damage characteristics of argillaceous sandstone under dry-wet cycle in acidic condition[D]. Chongqing:Chongqing University,2014.

[6] LI Xiaqing,ZHANG Guicai,GE Jujiang,et al. Potential formation damage and mitigation methods using seawater-mixed acid to stimulate sandstone reservoirs[J]. Journal of Natural Gas Science and Engineering,2016,35:11-20.

[7] 刘芳,徐金明. 基于试验视频图像的花岗岩细观组分运动过程研究[J]. 岩石力学与工程学报,2016,35(8):1602-1608. LIU Fang,XU Jinming. An investigation on movements of meso-compositions of granite specimen using video image processing[J]. Chinese Journal of Rock Mechanics and Engineering,2016,35(8):1602-1608.

[8] 朱泽奇,肖培伟,盛谦,等. 基于数字图像处理的非均质岩石材料破坏过程模拟[J]. 岩土力学,2011,32(12):3780-3786. ZHU Zeqi,XIAO Peiwei,SHENG Qian,et al. Numerical simulation of fracture propagation of heterogeneous rock material based on digital image processing[J]. Rock and Soil Mechanics,2011,32(12):3780-3786.

[9] XU Wenjie,YUE Zhongqi,HU Ruilin. Study on the mesostructure and mesomechanical characteristics of the soil-rock mixture using digital image processing based finite element method[J]. International Journal of Rock Mechanics and Mining Sciences,2008,45(5):749-762.

[10] YUE Zhongqi,CHEN Sha,THAM L G. Finite element modeling of geomaterials using digital image processing[J]. Computers and Geotechnics,2003,30(5):375-397.

[11] 徐金明,韩娜娜,李岩松. 石灰岩局部化变形的图像特征[J]. 岩石力学与工程学报,2010,29(10):2110-2115. XU Jinming,HAN Nana,LI Yansong. Image features of localized deformation of limestone[J]. Chinese Journal of Rock Mechanics and Engineering,2010,29(10):2110-2115.

[12] CHARLES J J,KUNCHEVA L I,WELLS B,et al. Stability of kerogen classification with regard to image segmentation[J]. Mathematical Geosciences,2009,41(4):475-486.

[13] UlUSAY R. The ISRM suggested methods for rock characterization,testing and monitoring:2007-2014[M]. Berlin:Springer International Publishing,2015.

[14] 孙欢,刘晓丽,王恩志,等. 基于X射线断层扫描预测岩石单轴抗压强度[J]. 岩石力学与工程学报,2019,38(增刊2):3575-3582. SUN Huan,LIU Xiaoli,WANG Enzhi,et al. Prediction on uniaxial compression strength of rocks with X-ray computed tomography[J]. Chinese Journal of Rock Mechanics and Engineering,2019,38(Sup.2):3575-3582.

[15] SALIMIDELSHAD Y,MORADZADEH A,KAZEMZADEH E,et al. Experimental investigation of changes in petrophysical properties and structural deformation of carbonate reservoirs[J]. Petroleum Exploration and Development,2019,46(3):565-575.

[16] 曹广祝,仵彦卿,丁卫华. 低渗透压力条件下砂岩渗透性质的CT试验[J]. 煤田地质与勘探,2005,33(4):59-62. CAO Guangzhu,WU Yanqing,DING Weihua. Permeability experiment of sandstone under low seepage pressures by X-ray CT test[J]. Coal Geology & Exploration,2005,33(4):59-62.

[17] 丁卫华,仵彦卿,曹广祝,等. 三轴条件下软岩变形破坏过程的CT图像分析[J]. 煤田地质与勘探,2003,31(3):32-35. DING Weihua,WU Yanqing,CAO Guangzhu,et al. The CT image analysis on the soft rock deformation and damage process under triaxial condition[J]. Coal Geology & Exploration,2003,31(3):32-35.

[18] 姜泳水,唐金辉,陈学佺. 二值图像中物体几何主轴的提取方法[J]. 计算机工程,2005,31(18):56-58. JIANG Yongshui,TANG Jinhui,CHEN Xuequan. Extracting method of geometrical principal axis for object from bi-tone image[J]. Computer Engineering,2005,31(18):56-58.

[19] 张法全,王国富,曾庆宁,等. 利用重心原理的图像目标最小外接矩形快速算法[J]. 红外与激光工程,2013,42(5):1382-1387. ZHANG Faquan, WANG Guofu, ZENG Qingning,et al. New algorithm for minimum enclosing rectangle of the object in the image region based on center-of-gravity principle[J]. Infrared and Laser Engineering,2013,42(5):1382-1387.

[20] 卢蓉,范勇,陈念年,等. 一种提取目标图像最小外接矩形的快速算法[J]. 计算机工程,2010,36(21):178-180. LU Rong,FAN Yong,CHEN Niannian,et al. Fast algorithm for extracting minimum enclosing rectangle of target image[J]. Computer Engineering,2010,36(21):178-180.

[21] 李洋,李岳阳. 一种快速提取植物叶片最小外接矩形的算法[J]. 江南大学学报(自然科学版),2015,14(3):273-277. LI Yang,LI Yueyang. Fast algorithm for extracting minimum enclosing rectangle of plant leaves[J]. Journal of Jiangnan University(Natural Science Edition),2015,14(3):273-277.

[22] HU Mingkuei. Visual pattern recognition by moment invariants[J]. IRE Transactions on Information Theory,1962,8(2):179-187.

[23] 刘钦甫,杨晓杰,丁述理. 有机酸对高岭石形成影响的模拟试验研究[J]. 煤田地质与勘探,1998,27(2):6-9. LIU Qinfu,YANG Xiaojie,DING Shuli. Simulation experiments for the influence of organic acid on the formation of kaolinite[J]. Coal Geology & Exploration,1998,27(2):6-9.