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国家自然科学基金(41072182)

作品数:6 被引量:11H指数:2
相关作者:李雁苏钰谢小茜夏北成苏洁更多>>
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发文基金:国家自然科学基金广东省自然科学基金广东省科技计划工业攻关项目更多>>
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6 条 记 录,以下是 1-6
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细沙介质中非湿润相流体剩余饱和度变化规律
2011年
通过对气-水两相细沙介质中干燥和湿润交替循环条件下饱和度-毛细压力(S-p)关系的测定,研究了不同初始条件下非湿润相流体剩余饱和度的变化规律。实验发现,在不同湿润过程中,相同级别初始水饱和度对应的空气剩余饱和度值较为接近;随着湿润过程中初始水饱和度的逐渐增大,其空气剩余饱和度呈升高趋势。在连续的干燥—湿润过程条件下,利用Land模型预测的非湿润相流体的剩余饱和度与柱实验实测值之间存在较大的误差。由此表明和干燥—湿润循环次数相比,初始水饱和度对空气剩余饱和度量级的影响要大,且后一个循环的空气剩余饱和度总受前一个循环的空气剩余饱和度的影响。
谢小茜李雁夏北成苏钰
水位波动下沙介质中饱和度-毛细压力关系滞后研究被引量:2
2011年
通过对气-水两相沙介质中干燥和湿润交替过程中的饱和度-毛细压力(S-p)关系的测定,研究了干燥和湿润交替过程中沙介质内非湿润相流体(空气)运移滞后问题。研究结果表明干燥和湿润过程之间的滞后程度受沙介质干燥-湿润循环次数影响不明显;滞后程度随着循环过程中湿润过程初始水饱和度的增加而逐渐减少。通过利用Van Genuchten(VG)模型对S-p关系进行的拟合和分析发现,水位波动引起的所有干燥过程中,反映侵入压大小的α值均很接近,从实测数据及拟合参数两方面均表明了沙介质的侵入压大致是一常数,不受干燥过程的路径和初始水饱和度的影响;湿润过程中参数α随着本过程初始水饱和度的升高而不断降低,这也表明了参数α值与干燥过程与湿润过程之间滞后性存在正相关。VG模型不但可以描述一般的S-p关系曲线,同时也可用于水位波动复杂条件下干燥和湿润过程中S-p关系的描述。
谢小茜李雁夏北成苏钰谷庆宝
关键词:水位波动
Testing of NAPL simulator to predict migration of a light nonaqueous phase liquid(LNAPL) under water table fluctuation in a sandy medium被引量:2
2014年
Nanoqueous phase liquid(NAPL) simulator is a powerful and popular mathematical model for modeling the flow and transport of non-aqueous phase liquids in subsurface,but the testing of its feasibility under water table fluctuation has received insufficient attention.The feature in a column test was tested through two cycles of water table fluctuation.The sandy medium in the column was initially saturated,and each cycle of water table fluctuation consisted of one water table falling and one rising,resulting in a drainage and an imbibition of the medium,respectively.It was found that the difference between the simulated and measured results in the first drainage of the column test was minor.However,with the propagation of the water table fluctuations,the simulation errors increased,and the simulation accuracy was not acceptable except for the first drainage in the two fluctuation cycles.The main reason was proved to be the estimation method of residual saturation used in this simulator.Also,based on the column tests,it was assumed that the resulting residual saturation from an incomplete imbibition process was a constant,with a value equal to that of the residual value resulting from the main imbibition process.The results obtained after modifying NAPL simulator with this assumption were found to be more accurate in the first cycle of water table fluctuation,but this accuracy decreased rapidly in the second one.It is concluded that NAPL simulator is not adequate in the case of LNAPL migration under water table fluctuation in sandy medium,unless a feasible assumption to estimate residual saturation is put forward.
周劲风李雁徐军M.Kamon
大气环境自动监测系统优化实现被引量:2
2013年
以大气环境监测系统为例,通过分析提出了切实可行的软件优化方案。用动态链接库解决了不同厂商多种测量仪器的接入问题,减少了后续的二次开发工作,而且通过优化数据库存储结构和改善传输机制提高了系统的稳定性和可靠性。
杨日魁吴平涛温晶鲍若峪
关键词:大气环境监测系统动态链接库
TOUGH+HYDRATE水合物模型参数敏感性分析被引量:5
2014年
运用国际上较为先进的水合物开采模拟软件TOUGH+HYDRATE(T+H)对我国南海水合物藏竖井降压开采假设进行数值模拟,采用LH-OAT全局敏感性分析方法,对模型中19个普遍应用的水合物层参数进行了敏感性分析,并对参数敏感性从重到轻进行了极敏感、敏感、一般敏感和不敏感4个水平的等级划分。研究表明:T+H的参数敏感性随评价目标、时间和空间位置的不同而不同。对CH4气体累积产量有显著影响的参数有:Stone指数(n)、固相渗透率缩减指数(PRE)、绝对渗透率(Permeabilities)、流体临界饱和度(CMPS)。随着模拟时间的增加,参数对水合物饱和度的整体敏感度提高。在空间分布上,随着与井壁水平距离的增加,所有参数对水合物饱和度的敏感度降低。敏感参数的确定对提高模型的准确性有重大意义。在实际应用中要有针对性地调节参数,以获得最优效果。
刘丽强徐军李雁夏真苏钰苏洁
关键词:天然气水合物数值模拟
Hysteresis of saturation-capillary pressure relations under consecutive drainage-imbibition cycles in fine sandy medium
2012年
The hysteresis of saturation-capillary pressure (S-p) relations was investigated in a fine sandy medium under consecutive drainage-imbibition cycles, which resulted from scheduled water level fluctuations. A drainage-imbibition cycle starts with a drainage process and ends with an imbibition process in sequence. The saturation and capillary pressure were measured online with time domain reflectometry (TDR) probes and T5 tensiometers, respectively. Results show that the relation between the degree of hysteresis and the number of the drainage-imbibition cycles is not obvious. However, the degree decreases with the increase of the initial water saturation of the imbibition processes in these drainage-imbibition cycles. The air-entry pressure of a sandy medium is also found to be constant, which is independent of the drainage-imbibition cycles and the initial water saturation of the drainage process. In all the imbibition processes, parameter a of the van Genuchten (VG) model decreases with the increase of the initial water saturation, which corresponds positively to the magnitude of the hysteresis.
XIE Xiao-xiLI YanXIA Bei-chengXU Li-minSU YuGU Qing-bao
关键词:HYSTERESISIMBIBITION
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