高温高产额可控脉冲中子发生器研究

发布时间：2018-03-23 19:59

  本文选题：可控中子源　切入点：中子管　出处：《西安石油大学》2015年硕士论文

【摘要】：放射性测井作为石油测井的一个重要分支,在石油勘探及生产中有着其他测井方法无可比拟的优势,因而被广泛使用。但近年来随着人们环保及自我防护意识的不断增强,放射性镅铍中子源的使用受到了诸多限制,从而阻碍了放射性测井的发展。因此利用可控中子发生装置替代传统放射性镅铍中子源成为各大石油公司的工作重点。本文详细介绍了脉冲中子发生器的工作原理及组成,对中子发生器重要部件中子管进行了深入的研究,通过大量实验改进了中子管氘氚储存器材料及结构,优化了离子源及靶的结构和选材,使中子管在适应高温工作的同时增加了中子产额、提高了使用寿命。本文还优化了中子发生器三大电源电路。通过完善高压倍压电路来提高整支仪器的稳定性及中子产额;改进阳极脉冲电源使其工作频率可以达到20KHz并实现快速关断;改进灯丝恒流电源,使氘氚储存器出气更平稳,电离更稳定。完善反馈电路,通过各个反馈数值调整中子管工作状态,使中子产额稳定,中子产额误差控制在±3%以内。新型的脉冲中子发生器可以用在元素测井,随钻测井等使用要求较高的测井仪器里。通过以上改进使传统的可控中子发生器有了质的提高。整支仪器在175℃环境温度、中子产额2×108N/S下可长时间稳定工作,为中子测井提供了高效可靠地可控中子源。
[Abstract]:As an important branch of petroleum logging, radioactive logging has unparalleled advantages in other logging methods in petroleum exploration and production, so it is widely used. But in recent years, with the increasing of people's awareness of environmental protection and self-protection, The use of radioactive americium-beryllium neutron sources is subject to many restrictions, Thus, the development of radioactivity logging has been hindered. Therefore, the use of controlled neutron generator to replace the traditional radioactive americium-beryllium neutron source has become the focus of various oil companies. The working principle and composition of the pulse neutron generator are introduced in detail in this paper. The neutron tube, an important component of neutron generator, is studied in depth. The material and structure of deuterium and tritium storage are improved through a large number of experiments, and the structure and material selection of ion source and target are optimized. This paper also optimizes the three main power supply circuits of the neutron generator and improves the stability and neutron yield of the whole instrument by perfecting the high voltage piezoelectric circuit. By improving the anode pulse power supply, the working frequency can reach 20KHz and realize fast turn-off, and the filament constant current power supply is improved to make the deuterium and tritium storage gas output more stable and ionization more stable. By adjusting the working state of the neutron tube by each feedback, the neutron yield is stabilized and the neutron yield error is controlled within 卤3%. The new pulse neutron generator can be used in element logging. The conventional controlled neutron generator has been improved by the above improvements in the logging tools with higher requirements for use such as logging while drilling. The whole instrument can work stably for a long time at the ambient temperature of 175 鈩，

本文编号：1654955