Numerical simulation of controllable source neutron porosity logging based on CLYC detector

Abstract

BackgroundUsing Cs2LiYCl6:Ce (CLYC) instead of 3He detector in neutron porosity logging has become a new idea for the development of logging tools.PurposeThis study aims to investigate the feasibility of using a new CLYC crystal based detector in neutron porosity logging.MethodsThe Monte Carlo simulation method was employed to study the thermal neutron counting flux of 6Li CLYC detector with different purities and sizes. Thermal neutron counting of this new detector was compared with that of 3He detector under different pressures, the replacement of CLYC detector was verified according to the neutron porosity response of different detectors.ResultsThe results show that the new CLYC detector has high thermal neutron counting efficiency when its purity of 6Li and size are large. Compared with 3He detector, the CLYC detector with low thermal neutron detection efficiency has a near/far detector ratio similar to that of 3He detector after optimizing the combination of source diatances which can be effectively applied to obtain formation porosity.ConclusionsThis study provides a theoretical basis for the detector selection and replacement of neutron porosity logging tools in the future.

Keywords

• clyc detector
• 3he detector
• thermal neutron
• neutron porosity logging
• monte carlo method