摘要:
中子管是可控中子源测井仪的核心部件，其工作的稳定性、耐高温、中子产额等指标对仪器的工作性能有重要影响。目前，随着深地探测的发展，应用于石油测井的中子管中子产额、耐高温性能、寿命、工作稳定性均有待提升。从结构、材料、制造工艺三方面，对自成靶中子管进行优化设计，进一步降低功耗，提高工作时间。通过耐高温、寿命和中子产额三项指标对外径为25 mm的ENT2465样管进行了性能评估测试，将样管置于中子实验测试平台的油槽内，连接激励线缆，记录样管工作过程中的温度、累计工作时间、中子产额、靶压、靶流和阳极电流。结果表明：在靶压为80 kV、靶流小于60 μA条件下，该样管累计使用寿命超过了1 000 h，其中175℃下连续工作时间持续23 h、累计工作超过500 h，室温下连续工作时间持续36 h。在相同靶压、靶流条件下，1 000 h后中子产额仅下降5.3%。
Abstract:
The neutron tube is the core component of the controllable neutron source logging instrument. Its working stability, temperature resistance, neutron yield and other indicators have an important impact on the working performance of instrument. At present, with the requirement of deep logging, the neutron tube used in logging is supposed to improve neutron yield, temperature resistance, operating life and working stability. In this paper, the structure, materials and manufacturing process of drive-in target neutron tube are designed and optimized to reduce power consumption and improve operating time. The temperature resistance, operating life, and neutron yield of sample tube have tested to estimate the performance of ENT2465 with an outer diameter of 25 millimeters. Place the sample tube in the oil tank of the neutron testing platform and connect the cable. Record the temperature, cumulative working time, neutron yield, target voltage, target current and anode current during the work of the sample tube. The results show that under the target voltage of 80 kV and target current less than 60 μA, the accumulated operating life of the sample tube exceeds 1 000 hours, including 23 hours of continuous operation at 175℃ and more than 500 hours of accumulated operation, and 36 hours of continuous operation at room temperature. The neutron yield only decreases by 5.3 % after 1 000 hours under the same target voltage and current.
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