小直径自然伽马能谱测井仪设计  

Design of Small Diameter Natural Gamma-ray Spectrometer Logging Tool

作　　者：严语鸣 李会银[1] 徐德龙[2] 唐若飞 叶显诗 YAN Yuming;LI Huiyin;XU Delong;TANG Ruofei;YE Xianshi(School of Goesciences, China University of Petroleum, Qingdao, Shandong 266580, China;The Institute of Acoustics of the Chinese Academy of Sciences, Beijing 100101, China;Standard Met rology Center of Beihai Branch of State Oceanic Administration, Qingdao, Shandong 266033, China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国科学院声学研究所,北京100101 [3]国家海洋局北海分局标准计量中心,山东青岛266033

出　　处：《测井技术》2018年第1期113-116,共4页Well Logging Technology

基　　金：国家重大科研装备研制项目深部资源探测核心装备研发;自然伽马能谱测井仪研发(ZDYZ2012-1-07-01-03-03)

摘　　要：为应对深部矿床测井的井眼越来越小的情况,研制60mm小直径自然伽马能谱测井仪。为减小仪器尺寸,放弃了传统的保温瓶设计,采用耐高温探测器,探测器选择用Φ38mm×300mm的NaI(Tl)晶体。为减小电路板占用面积,设计基于FPGA的集成度更高的电路,使用FPGA作为成谱核心,单片机作为通讯与控制核心,使用串行芯片取代并行芯片。使用地面软件与井下控制相结合的方法进行稳谱。在实验室中模拟不同温度的测井环境对小直径自然伽马能谱测井仪进行测试,对比稳谱前后的能谱数据。测试结果表明,该仪器能够抑制高温对能谱的影响。A high-temperature slim-hole natural gamma-ray spectrometry logging tool with60 mm OD is developed to meet the need of logging in small wellbore through deep deposits.In order to decrease its size,the tool employs a high temperature detector,and abandons the traditional design of using Dewar flask.AΦ38 mm×300 mm NaI（Tl）crystal is selected and used in the detector.In the aspect of hardware,a FPGA-based higher integration circuit is designed to reduce PCB occupied area.It uses a FPGA as the PHA core,a single-chip as the communication and control core,and serial chips to replace parallel ones.In the aspect of software,a combination method of ground software and downhole control is used to stabilize the spectrum.In the laboratory, we simulated logging environments of different temperature to test the spectrometer,and compared the spectrum data before stabilizing with the spectrum data after stabilizing.The results show that the small diameter natural gamma-ray spectrometer can suppress the influence of high temperature on thespectrum.

关 键 词：测井仪器 自然伽马能谱 小直径 FPGA 

分 类 号：P631.84[天文地球—地质矿产勘探]