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首页> 外文期刊>Journal of natural gas science and engineering >Study of fracture toughness and weakening mechanisms in gypsum interlayers in corrosive environments
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Study of fracture toughness and weakening mechanisms in gypsum interlayers in corrosive environments

机译：腐蚀环境下石膏夹层的断裂韧性及弱化机理研究

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China's rock salt deposits, which are mostly located in the Yunying area, are typically characterized by their interlayers. In the construction and operation of salt caverns, gypsum interlayers are soaked in brine and oil. To investigate the fracture toughness and weakening mechanisms of gypsum interlayers in corrosive environments, a series of laboratory tests, including cracked chevron notched Brazilian disc (CCNBD) tests and micro computed tomography (MO') scanning, was performed. Ninety CCNBD specimens and 15 small specimens, with dimensions of 5 mm x 5 mm x 5 mm, were prepared and then soaked in 4 types of liquid and at 3 different temperatures. The results indicate that the fracture toughness of gypsum decreases significantly with increasing temperature when soaked in a given liquid. By contrast, the fracture toughness of gypsum remains approximately identical after treatment with water, half-saturated brine, and saturated brine at the same temperature. With increasing time and temperature, the porosity of the gypsum increases. The rate of porosity change (slope) increases with increasing temperature, but it remains stable with increasing brine concentration. Water and brine have more severe corrosive effects on gypsum than does acidic oil. The weakening of gypsum soaked in water and brine is attributed to the combined effects of water, temperature, and chlorine ions. Notably, the water-temperature effect contributes to a severe weakening of gypsum interlayers, but the chlorine ions have little effect. The mechanism of the weakening of gypsum soaked in acidic oil is chemical reactions and dehydration. Petroleum acid (naphthenic acid) reacts with gypsum to produce calcium naphthenate, which can be dissolved in the oil phase. During this process, the dissolution of calcium naphthenate in the oil phase promotes the forward reaction. Consequently, the study has significance for the evaluation of the leakage risk of storage caverns in bedded salt deposits. (C) 2015 Elsevier B.V. All rights reserved.
机译：中国的岩盐矿床大多位于云营地区，通常以夹层为特征。在盐洞的建造和运营中，将石膏夹层浸泡在盐水和油中。为了研究在腐蚀环境中石膏夹层的断裂韧性和削弱机理，进行了一系列实验室测试，包括开裂的V型缺口巴西圆盘（CCNBD）测试和微型计算机断层扫描（MO'）扫描。准备了90个CCNBD标本和15个尺寸为5 mm x 5 mm x 5 mm的小标本，然后将其浸入4种类型的液体中并在3个不同的温度下浸泡。结果表明，当浸泡在给定的液体中时，石膏的断裂韧性随着温度的升高而显着降低。相反，在相同温度下用水，半饱和盐水和饱和盐水处理后，石膏的断裂韧性保持大致相同。随着时间和温度的增加，石膏的孔隙率增加。孔隙率的变化率（斜率）随着温度的升高而增加，但随着盐水浓度的增加而保持稳定。与酸性油相比，水和盐水对石膏的腐蚀作用更严重。浸泡在水和盐水中的石膏的减弱归因于水，温度和氯离子的综合作用。值得注意的是，水温效应会严重削弱石膏中间层，但氯离子的影响很小。浸泡在酸性油中的石膏的弱化机理是化学反应和脱水。石油酸（环烷酸）与石膏反应生成环烷酸钙，可以溶解在油相中。在此过程中，环烷酸钙在油相中的溶解促进了正向反应。因此，该研究对于评价层状盐矿中储藏洞的渗漏风险具有重要意义。 （C）2015 Elsevier B.V.保留所有权利。

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