层状盐岩双井流场浓度场试验及数值计算
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摘要
为了研究层状盐岩小间距双井水溶造腔中流场浓度场特征,进行了相关的模型试验和数值计算。基于量纲分析法搭建了模拟建腔期腔内流场的相似模型试验平台,利用染色法研究了建腔期腔内流场运移规律,并采用时均法测量腔内浓度。试验发现:流量越大,浮羽流极限高度越高,但腔内浓度变化速率减小,排卤口浓度变低;提管高度的改变实际上是改变了淡水相对于腔体的初始空间位置;夹层赋存状态变化实际是改变夹层在溶腔中的空间位置,处于不同区域的夹层会改变腔体流场的运动趋势和作用范围。利用Fluent软件进行3D数值计算,结果验证了室内试验流场的普遍规律,得出同样的分层结果;但在速度分布上,发现流场底部并非无宏观流动,而是自然对流扩散和沉降作用占主导。
Experimental model tests and numerical modelling were carried out to reveal characteristics of the concentration field of flow field in a double-well water-soluble cavity with the small spacing in the layered salt rock. Based on a dimensional analysis method, a similar model experiment platform was established to simulate the flow field in the cavity during its construction. The flow field migration law of the cavity and the intra-cavern concentration were measured by the dyeing method and a time averaging method respectively. It is found that the higher the flow rate was, the higher the limit height of the plume was. However, the change rate of concentration in the cavern decreased and the concentration of the outlet declined. The variation of the height of casing pipe actually changes the initial space position of freshwater relative to the cavity. The change of the interlayer occurrence state can be seen as changing the spatial position of the interlayer in the cavity, and interlayer in different regions change the movement trend and the range of action of the cavity flow field. 3D numerical calculation was conducted by using the Fluent software. The same stratified results were obtained as them from experiments in the laboratory, which verified the general rule of flow field from tests. However, in terms of velocity distribution, it was found that the flow field at the bottom was not macro-flow, which was dominated by natural convection, diffusion and sedimentation.
Experimental model tests and numerical modelling were carried out to reveal characteristics of the concentration field of flow field in a double-well water-soluble cavity with the small spacing in the layered salt rock. Based on a dimensional analysis method, a similar model experiment platform was established to simulate the flow field in the cavity during its construction. The flow field migration law of the cavity and the intra-cavern concentration were measured by the dyeing method and a time averaging method respectively. It is found that the higher the flow rate was, the higher the limit height of the plume was. However, the change rate of concentration in the cavern decreased and the concentration of the outlet declined. The variation of the height of casing pipe actually changes the initial space position of freshwater relative to the cavity. The change of the interlayer occurrence state can be seen as changing the spatial position of the interlayer in the cavity, and interlayer in different regions change the movement trend and the range of action of the cavity flow field. 3D numerical calculation was conducted by using the Fluent software. The same stratified results were obtained as them from experiments in the laboratory, which verified the general rule of flow field from tests. However, in terms of velocity distribution, it was found that the flow field at the bottom was not macro-flow, which was dominated by natural convection, diffusion and sedimentation.
引文
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[2]殷建平,汤妍娇.欧洲6国及美国国家天然气储备状况[J].天然气地球科学,2014,25(5):783-790.YIN Jian-ping,TANG Yan-jiao.Natural gas reserves storage situation of 6 European countries and the U.S.[J].Natural Gas Geoscience,2014,25(5):783-790.
[3]REMSON D R,DOMMERS O B,JESSEN F W.Techniques for developing predetermined shaped cavities in solution mining[C]//RAU J L ed.Proceedings of the2nd Symposium on Salt.[S.l.]:[s.n.],1965:297-310.
[4]SNOW R H,NIELSEN H.Solution mining studies:Solution Mining Research Institute file 66-0001-SMRI[R].[S.l.]:Solution Mining Research Institute,1966.
[5]SNOW R H,NIELSEN H.Solution mining studies:Solution Mining Research Institute file 66-0003-SMRI[R].[S.l.]:Solution Mining Research Institute,1966.
[6]PODIO A L,SABERIAN A.Optimization of solution mining operations[C]//Fifth International Symposium on Salt-Northern Ohio Geological Society[S.l.]:[s.n.],1979.
[7]BOTHO S.New development in solution mining technology[C]//Proceedings of SMRI Spring 1997Meeting.Cracow:[s.n.],1997.
[8]张军伟,姜德义,陈结,等.复杂卸荷条件下卤水流量对盐岩溶解损伤特征研究[J].岩土力学,2017,38(3):640-648.ZHANG Jun-wei,JIANG De-yi,CHEN Jie,et al.Study on dissolution characteristics of brine rock under complex unloading conditions[J].Rock and Soil Mechanics,2017,38(3):640-648.
[9]马旭强,施锡林,尹洪武,等.三轴压缩下含夹层盐岩破坏机制[J].岩土力学,2018,39(2):644-650.MA Xu-qiang,SHI Xi-lin,YIN Hong-wu,et al.Failure mechanism of interlayer salt rock under triaxial compression[J].Rock and Soil Mechanics,2018,39(2):644-650.
[10]梁卫国,赵阳升,徐素国.盐矿群井致裂控制水溶开采技术及应用[J].矿业研究与开发,2005,25(4):7.LIANG Wei-guo,ZHAO Yang-sheng,XU Su-guo.The technology and application of well fracturing control in the salt mine[J].Mining Research and Development,2005,25(4):7.
[11]陈结,姜德义,刘春,等.盐穴建造期夹层与卤水运移相互作用机理分析[J].重庆大学学报(自然科学版),2012,35(7):107-113.CHEN Jie,JIANG De-yi,LIU Chun,et al.The interaction mechanism of salt cavity construction period interlayer and the brine migration[J].Journal of Chongqing University(Natural Science Edition),2012,35(7):107-113.
[12]姜德义,易亮,陈结,等.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(增刊):14-21.JIANG De-yi,YI Liang,CHEN Tie,et al.Similar experiments on the concentration field of bedded salt cavern[J].Journal of Sichuan University(Engineering Science Edition),2014,46(Supp.):14-21.
[13]施锡林,李银平,杨春和,等.多夹层盐矿油气储库水溶建腔夹层垮塌控制技术[J].岩土工程学报,2011,33(12):1957-1963.SHI Xi-lin,LI Yin-ping,YANG Chun-he,et al.Collapse control technologyfor interbeds in solution mining for oil/gas storage in multi-interbedded salt formation[J].Chinese Journal of Geotechnical Engineering,2011,33(12):1957-1963.
[14]李银平,施锡林,杨春和,等.深部盐矿油气储库水溶造腔控制的几个关键问题[J].岩石力学与工程学报,2012,31(9):1785-1796.LI Yin-ping,SHI Xi-lin,YANG Chun-he,et al.Several key problems about control of solution mining for oil/gas storage in deep salt mine[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(9):1785-1796.