中子孔隙度测井探测器气压响应数值模拟

doi:10.7538/tws.2016.29.02.0098

摘要/Abstract

摘要：

在补偿中子孔隙度测井中He-3管利用(n,p)反应来探测热中子，管内灵敏区所充氦气气压对中子探测效率影响较大，决定中子孔隙度测量精度。利用蒙特卡罗方法模拟研究不同地层条件下远、近探测器计数率随He-3气压的变化规律。计算结果显示，随着He-3气压增大，近、远探测器计数先增大再趋于平缓，计数比值略有增大，孔隙度灵敏度增加，孔隙度测量误差呈幂指数减小，提高了测量精度。研究结果可为仪器研制过程中选择He-3管提供技术支持。

关键词: He-3管, 灵敏区气压, 中子, 蒙特卡罗模拟

Abstract:

Thermal neutrons are detected by (n,p) reaction of Helium-3 tube in the compensated neutron logging. The helium gas pressure in the counting area influences neutron detection efficiency greatly, and then it is an important parameter for neutron porosity measurement accuracy. The variation law of counting rates of a near detector and a far one with helium gas pressure under different formation condition was simulated by Monte Carlo method. The results showed that with the increasing of helium pressure the counting rate of these detectors increased firstly and then leveled off. In addition, the neutron counting rate ratio and porosity sensitivity increased slightly, the porosity measurement error decreased exponentially, which improved the measurement accuracy. These research results can provide technical support for selecting the type of Helium-3 detector in developing neutron porosity logging.

Key words: Helium-3 tube, counting area gas pressure, neutron, Monte Carlo simulation

田立立;张锋;王新光;刘军涛. 中子孔隙度测井探测器气压响应数值模拟[J]. 同位素, 2016, 29(2): 98-102.

TIAN Li-li;ZHANG Feng;WANG Xin-guang;LIU Jun-tao. Monte Carlo Study on Gas Pressure Response of He-3 Tube in Neutron Porosity Logging[J]. Journal of Isotopes, 2016, 29(2): 98-102.

参考文献

［1］黄隆基, 核测井原理［M］. 东营：石油大学出版社，2000：249-259.
［2］付广智,何彬,章喜喜,等. BF₃中子探测器阵列探测效率的蒙特卡罗计算［J］. 核电子学与探测技术,2006,26(1):65-67.Fu Guangzhi, He Bin, Zhang Xixi, et al. Detector efficiency computed with Monte Carlo method of the BF₃neutron detector array［J］. Nuclear Electronics& Detection Technology, 2006, 26(1): 65-67(in Chinese).
［3］张明,施俊,任忠国. ³He中子计数管的机理及结构［J］. 核电子学与探测技术,2009,29(5):1170-1171.Zhang Ming, Shi Jun, Ren Zhongguo. The theory and configuration of ³He neutron counting tube［J］. Nuclear Electronics& Detection Technology, 2009, 29(5): 1170-1171(in Chinese).
［4］杨巧荣. 4π球形³He中子探测器的蒙特卡罗模拟研究及设计［D］. 兰州：兰州大学,2011.
［5］刘应都,张国强,王宏伟,等. ³He 正比计数器探测效率模拟及灵敏度刻度［J］. 核技术，2012,35(3):175-178.Liu Yingdu, Zhang Guoqiang, Wang Hongwei, et al. Simulation of detection efficiency for a ³He proportional counter and its sensitivity calibration［J］. Nuclear Techniques, 2012, 35(3): 175-178(in Chinese).
［6］Ravazzani A, Foglio P A, Jaime R, et al. Characterization of ³He proportional counters［J］. Radiation measurements, 2006, 41(5): 582-593.
［7］Bystritsky V M, Slepnev V M, Boreiko V F, et al. ³He detectors in experiments at the powerful pulsed accelerators［J］. Nuclear Instruments and Methods in Physics Research, 2002, 490(1-2): 344-355.
［8］夏凌志,张建民,杨志高,等. 蒙特卡罗方法在补偿中子测并仪器设计中的应用［J］. 测井技术,2003,27(6):77-480.Xia Lingzhi, Zhang Jianming, Yang Zhigao, et al. Application of Monte Carlo Method in compensated neutron log tool design［J］. WLT, 2003, 27(6): 477-480(in Chinese).
［9］Lintereur A, Conlin K, Ely J, et al. ³He and BF₃ neutron detector pressure effect and model comparison［J］. Nuclear Instruments & Methods in Physics Research, 2011, 652(1): 347-350.
［10］张锋,靳秀云,侯爽. D-T 脉冲中子发生器随钻中子孔隙度测井的蒙特卡罗模拟［J］. 同位素,2010,23(1):15-21.Zhang Feng, Jin Xiuyun, Hou Shuang. Monte Carlo simulation on compensated neutron porosity logging in LWD with D-T pulsed neutron generator［J］. Journal of Isotopes, 2010, 23(1): 15-21(in Chinese).
［11］Fantidis J, Nicolaou G, Potolias C, et al. The comparison of four neutron sources for Prompt Gamma Neutron Activation Analysis (PGNAA) in vivo detections of boron［J］. Journal of Radio analytical and Nuclear Chemistry, 2011, 290 (2): 289-295.

[1]	宋志浩, 张蕴瀚, 王宁, 郭宏利, 赵海龙, 高翔. 使用活性炭纤维从中性钼溶液中提取锝的方法研究[J]. 同位素, 2021, 34(2): 133-140.
[2]	梁启轩;张锋;谭海洲;范继林;李向辉. 一种利用中子瞬发伽马能谱确定含油饱和度方法及数值模拟[J]. 同位素, 2021, 34(1): 16-23.
[3]	柏磊;王仲奇;刘晓琳;李新军;邵婕文. 一种测量废包壳中U、Pu含量的方法研究[J]. 同位素, 2020, 33(3): 148-155.
[4]	王淼;童永彭. 硼中子俘获治疗的进展及前景[J]. 同位素, 2020, 33(1): 14-26.
[5]	刘轩;景士伟;李明非;郑彦;高亚东;年瑞雪. 基于标记中子方法的爆炸物特征γ能谱分析[J]. 同位素, 2019, 32(5): 309-314.
[6]	张锋;田立立. 可控中子及X射线源测井技术发展现状及趋势[J]. 同位素, 2019, 32(3): 133-150.
[7]	罗志福;吴宇轩;梁积新. 用于医用核素钼-99的制备方法[J]. 同位素, 2018, 31(3): 129-142.
[8]	杨丽芳;高翔. 应用MOCA程序设计煤料PGNAA实验装置[J]. 同位素, 2018, 31(2): 93-98.
[9]	王强;王月;郑玉来. 快中子伴随α粒子成像技术在包裹爆炸物检测中的应用[J]. 同位素, 2018, 31(1): 8-13.
[10]	吴志强;龚亚林. PGNAA方法测量元素的非线性规律研究[J]. 同位素, 2018, 31(06): 343-350.
[11]	姚永刚;肖才锦;金象春;运威旭;刘旭东;唐婵娟;石丛;杨俊凯;王平生;倪邦发. CARR堆冷中子瞬发伽玛活化分析系统及实验研究[J]. 同位素, 2018, 31(06): 362-369.
[12]	王谷军. 核反应堆内中子能谱测量技术[J]. 同位素, 2017, 30(4): 283-291.
[13]	杨鑫;李润东;王冠博;唐彬;孙勇. 瞬发伽马活化分析与中子层析照相联合测量技术[J]. 同位素, 2017, 30(3): 153-163.
[14]	姚永刚;肖才锦;金象春;王平生;石丛;刘旭东;唐婵娟;倪邦发. 仪器中子活化分析自动化系统研究[J]. 同位素, 2017, 30(3): 164-169.
[15]	王谷军;陈军;李春娟;宋明哲;张紫竹. IHNI-1中子束快中子注量率测量[J]. 同位素, 2017, 30(3): 170-174.