基于脉冲中子源的元素分析测井仪设计  

Design of elemental analysis logging tool based on pulsed neutron source

作　　者：李晋宇[1] 马双宝[1] 

机构地区：[1]华中科技大学自动化学院,武汉430074

出　　处：《国外电子测量技术》2017年第6期67-70,95,共5页Foreign Electronic Measurement Technology

摘　　要：为在石油测井过程中获取地层元素种类及含量等信息,研制了一种基于脉冲中子源的地层元素测井仪器。仪器控制中子源以脉冲的形式向地层发射中子,通过对脉冲时序进行控制,仪器可对中子反应不同阶段产生的γ射线的能量进行测量,从而获取详细的能谱与时间谱数据。经测试,仪器性能达到设计指标,能够有效获取256个能道,对应γ射线能量为0~10 MeV的能谱数据,包括非弹性散射谱、中子俘获谱和背景谱,以及256道,对应100ms中子发射周期的时间谱数据。对纯水井、含硫井、含碳井等实验井进行了化学源测试,所得测量结果与已知数据基本符合。In order to obtain the information about the species and content of the formation elements in the process of petroleum logging, a logging tool used for detecting formation elements based on the pulsed neutron source is developed. The neutron source, controlled by the instrument, sends neutrons to the formation in the form of pulses, by controlling the timing of the pulses, the tool can get the energy of gamma ray produced during different stages of neutron reaction, then detailed energy spectrum and time spectrum data can be obtained. The experiments show that the instrument performance meet the design index, the instrument can effectively get the energy spectrum data consist of 256 energy chan- nels, corresponding to 0-10 MeV γ ray energy, including the inelastic scattering spectrum ,the neutron capture spec- trum and the background spectrum; in addition, a 256 channels time spectrum corresponding to a 100 ms neutron emis- sion period is achieved. The experimental wells, such as pure water well, sour well and carbon bearing well, are tested using the chemical neutron source, and the measured results were in good agreement with the known data.

关 键 词：脉冲中子源 时序控制 能谱 时间谱 

分 类 号：TL817.2[核科学技术—核技术及应用] TN702[电子电信—电路与系统]