• 放射性同位素应用技术 •

随钻脉冲中子伽马密度测井最佳源距的优化设计

1. 中国石油大学（华东） 地球科学与技术学院，山东 青岛266580
• 出版日期:2016-05-20 发布日期:2016-06-03

Optimized Design of Spacing in Pulsed Neutron Gamma Density Logging While Drilling

ZHANG Feng;HAN Zhong-yue;WU He;HAN Fei

1. School of Geosciences, China University of Petroleum, Qingdao 266580, China
• Online:2016-05-20 Published:2016-06-03

Abstract:

Radioactive source, used in traditional density logging, has great impact on the environment, while the pulsed neutron source applied in the logging tool is more safety and greener. In our country, the pulsed neutron-gamma density logging technology is still in the stage of development. Optimizing the parameters of neutron-gamma density instrument is essential to improve the measuring accuracy. This paper mainly studied the effects of spacing to typical neutron-gamma density logging tool which included one D-T neutron generator and two gamma scintillation detectors. The optimization of spacing were based on measuring sensitivity and counting statistic. The short spacing from 25 to 35 cm and long spacing from 60 to 65 cm were selected as the optimal position for near and far detector respectively. The result can provide theoretical support for design and manufacture of the instrument.