用于孔隙度测井的中子发生器产额影响研究  

Research on the Influence of Neutron Generator Yield Used for Porosity Logging

作　　者：褚庆军 于传武 姜世莲 杨陆 张羽 高鹏 CHU Qingjun;YU Chuanwu;JIANG Shilian;YANG Lu;ZHANG Yu;GAO Peng(Logging Technology Research Institute, China National Logging Corporation, Daqing, Heilongjiang 163412, China;Well Logging Technology Pilot Test Center, China National Petroleum Corporation, Xi’an, Shaanxi 710077, China;Quality and Safety Supervision Center, China National Logging Corporation, Daqing, Heilongjiang 163412, China;Manufacture Company, China National Logging Corporation, Xi’an, Shaanxi 710077, China;Material and Equipment Company, China National Logging Corporation, Daqing, Heilongjiang 163412, China)

机构地区：[1]中国石油集团测井有限公司测井技术研究院,黑龙江大庆163412 [2]中国石油天然气集团有限公司测井技术试验基地,陕西西安710077 [3]中国石油集团测井有限公司质量安全监督中心,黑龙江大庆163412 [4]中国石油集团测井有限公司制造公司,陕西西安710077 [5]中国石油集团测井有限公司物资装备公司,黑龙江大庆163412

出　　处：《测井技术》2022年第3期262-267,共6页Well Logging Technology

基　　金：中国石油天然气集团有限公司科学研究与技术开发项目“测井核心装备与软件平台研制”(2021DJ3905);中国石油集团测井有限公司课题“测井物理试验和测试基础条件建设与应用”(CNLC2022-9A02)。

摘　　要：中子发生器是可控中子源测井仪的核心部件之一,其输出中子产额的稳定性对可控中子源测井仪的性能有重要影响。相比于常用的镅铍同位素中子源,中子发生器的中子产额稳定性较差。影响中子发生器中子产额的因素包括中子管累计工作时间、环境温度、供电参数等。数据分析表明:累计工作时间增加、环境温度上升是导致中子产额下降的主要影响因素;供电参数中,靶压、阳极电流对中子产额的影响规律可以通过刻度数据拟合出的函数精确表示。总结出一套基于上述影响因素的可控源孔隙度测井仪孔隙度校正方法,现场实验表明该方法可有效提高可控源测井仪孔隙度的精度。Neutron generator is one of the core components of controllable neutron source logging tool.The stability of its output neutron yield has an important influence on the performance of the controlled neutron source logging tool.Compared with americium beryllium isotope neutron source,neutron generator has poor stability of neutron yield.The factors that affect the yield of neutron generator include the cumulative service time of neutron tube,ambient temperature,power supply parameters,etc.Through data analysis,it is found that the increase of cumulative service time and ambient temperature are the main factors leading to the decrease of neutron yield.The influence law of target voltage and anode current on neutron yield in power supply parameters can be accurately expressed by the formula fitted from scale data.A set of porosity correction method of controllable source porosity logging tool based on the above influencing factors is summarized.Field experiments show that this method can effectively improve the repeatability of porosity for controllable source logging tool.

关 键 词：中子发生器 中子管 中子产额 孔隙度校正 

分 类 号：P631.84[天文地球—地质矿产勘探]