盐穴储气库不同类型盐岩溶蚀特性实验研究
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摘要
我国盐穴储气库建库地质条件复杂,含泥夹层较多,为盐穴溶腔建库形状控制增加了难度。文章针对不同类型盐岩溶蚀特性进行实验研究,分析了不溶物含量和形式不同的情况下溶蚀速度、溶解质量与波美度的关系。结果表明:(1)盐岩中的不溶物遇水吸附水,实验样品在损失可溶盐质量的同时增加不溶物吸附水的质量,溶解质量减少的速度小于溶蚀速度减少的速度;(2)不溶物的存在阻碍了盐岩的溶解,尤其是结构致密的不溶物;(3)层状盐岩侧溶实验盐层与夹层接触面溶蚀速度与盐层溶蚀速度不一致:盐层下部与夹层接触面的溶蚀速度比盐层溶蚀速度小,盐层上部与夹层接触面的溶蚀速度比盐层的溶蚀速度大。
Our country's salt cavern underground gas storage has complicated geological conditions and more salt-mudstone interlayer,which makes it difficult to control the shape of salt caverns. The dissolution characteristics of different types of salt rock are studied,and the relationship between the dissolution rate,the dissolving mass and the degree Baum is analyzed. The following experimental results were obtained. First,the insoluble substances in the salt rock absorb water,and the experimental samples increase the quality of the water absorbed by insoluble salts while the quality of the soluble salts is lost. The rate of dissolving mass reduction is less than that of dissolution rate. Second,the existence of insoluble matter hinders the dissolution of salt rock,especially the compact insoluble substance. Thirdly,in the side dissolution of bedded salt rock,the dissolution rate of the contact surface of salt layer and interlayer is not consistent with that of salt layer.The dissolution rate of the interface between the lower salt layer and the interlayer is smaller than that of the salt layer,and the dissolution rate of the interface between the upper salt layer and the interlayer is larger than that of the salt layer.
Our country's salt cavern underground gas storage has complicated geological conditions and more salt-mudstone interlayer,which makes it difficult to control the shape of salt caverns. The dissolution characteristics of different types of salt rock are studied,and the relationship between the dissolution rate,the dissolving mass and the degree Baum is analyzed. The following experimental results were obtained. First,the insoluble substances in the salt rock absorb water,and the experimental samples increase the quality of the water absorbed by insoluble salts while the quality of the soluble salts is lost. The rate of dissolving mass reduction is less than that of dissolution rate. Second,the existence of insoluble matter hinders the dissolution of salt rock,especially the compact insoluble substance. Thirdly,in the side dissolution of bedded salt rock,the dissolution rate of the contact surface of salt layer and interlayer is not consistent with that of salt layer.The dissolution rate of the interface between the lower salt layer and the interlayer is smaller than that of the salt layer,and the dissolution rate of the interface between the upper salt layer and the interlayer is larger than that of the salt layer.
引文
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[3]Durie R. W,Jessen F. W. Mechanism of the dissolution of salt in the formation of underground salt cavities[J]. Society of Petroleum Engineers Journal,1964,4(2):183-190.
[4]Durie R. W,Jessen F. W. The influence of surface features in the salt dissolution process[J]. Society of Petroleum Engineers Journal,1964,4(3):275-281.
[5]肖长富,阳友奎,吴刚,等.岩盐溶解特性及其传质过程的研究[J].重庆大学学报,1993,16(2):51-57.
[6]杨骏六,杨进春,邹玉书.岩盐水溶特性的试验研究[J].四川联合大学学报(工程科学版),1997,1(2):74-80.
[7]徐军.难溶性钙芒硝淡钙液化学溶浸实验研究[D].太原:太原理工大学,2013.
[8]高丽,苏如海,戴鑫,等.盐井水溶开采上溶速度影响因素研究[J].中国井盐矿,2017,48(6):11-13.
[9]王春荣.岩盐溶解速率影响因素实验研究[D].重庆:重庆大学,2009.
[10]杨欣.盐岩静‐动溶溶蚀特性与水溶建腔流体输运机理研究[D].重庆:重庆大学,2015.
[11]姜德义,易亮,陈结,任松,张军伟,李银平.含夹层盐穴建腔期浓度场相似试验[J].四川大学学报(工程科学版),2014,46(5):14-21.
[12]文永江.高不溶物含量盐穴建槽优化研究[D].重庆:重庆大学,2014.
[13]李建君,王立东,刘春,等.金坛盐穴储气库腔体畸变影响因素[J].油气储运,2014,33(3):269-273.
[14]余乐.考虑夹层情况下盐穴储气库建腔方案优化研究[D].成都:西南石油大学,2015.
[15]高洪波.石膏夹层对层状盐岩溶腔建造影响研究[D].太原:太原理工大学,2012.
[16]李康,完颜祺琪,王立献,等.盐穴储气库水溶造腔数值模拟技术研究进展[J].盐科学与化工,2017,46(12):1-5.