摘要
脉冲中子氧活化测井方法通过活化时间谱来监测含氧流体的流动,该方法适应性强,应用广泛。首先,对活化时间谱数值模拟的现状进行了概述:McKeon等给出了一种最早的宏观数学模型,该模型没有给出活化分布和探测器响应函数的具体表达式,而是基于MCNP软件构建模拟模型,给出模型状态下活化分布和探测器响应函数的模拟计算结果;姜亦忠等采用McKeon等给出活化时间谱模拟模型,对模型的积分计算过程引入蒙特卡洛方法实现,给出了活化时间谱的模拟结果,但也没有谈及活化分布和探测器响应函数的确定问题;梁庆宝基于微元思想,构建了活化时间谱的微元模拟模型。其次,基于MCNP程序构建了静态情形下活化时间谱的模拟模型,给出了一个新的模拟结果。但该模型也仅模拟了静止态CO2流体中的活化时间谱,仍然不能解决流动态下的CO2时间谱的模拟问题。就目前的数值模拟状况来看,只有梁庆宝模型能够模拟流动状态下的CO2时间谱,据此模型,对比了源距、探测器尺寸、温度、压力各因素对时间谱的影响。最后,并对发展方向进行了阐述。
Pulse Neutron Oxygen Activation Logging Technology(PNOALT)uses activated time spectrum to monitor the movement of oxygen-containing flow.The technology is well-adapted and widely used.Firstly,the paper summarizes the overview of activated time spectrum numerical simulation:McKeon et al.It presents an earliest macroscopic mathematical model,but the actual formulas of activated distribution function and detector spatial response function are not given,it constructs a simulation model based on MCNP software,and gets simulated computing results of activated distribution function and detector spatial response function under certain model state;Jiang Yi-zhong et al.introduces Monte Carlo method for calculating the integral computation into McKeon's model,and get simulated activated time spectrum,but Jiang does not talk about how to determine activated distribution function and detector spatial response function.Liang Qin-bao builds an element simulation model based on element simulation method.Secondly,the authors build a simulation model based on MCNP software to simulate activated time spectrum,but,the model is just suitable for actionless CO2 fluid,it can't simulate flowing CO2 fluid.According to the current situation of numerical simulation,nothing but Liang's model can simulate activated time spectrum for flowing CO2 fluid,the authors present the influence of some factors,such as S-D spacing,detector size,temperature and pressure,on activated time spectrum.Lastly,the authors discuss development directions of activated time spectrum numerical simulation.
出处
《长江大学学报（自科版）（中旬）》
CAS
2014年第11期42-45,4,共4页
Journal of Yangtze University(Nature Science Edition)
基金
国家自然科学基金项目(61273179)
湖北省自然科学基金重点项目(2013CFA053)
湖北省教育厅科学技术项目(Q20121216)
关键词
脉冲中子氧活化测井
活化时间谱
数值模拟
pulsed neutron oxygen activation logging
activated time spectrum
numerical simulation
review
