Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (4): 40502-040502.doi: 10.11889/j.0253-3219.2020.hjs.43.040502

• NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH • Previous Articles    

Data correction and experimental study of neutron porosity logging using D-T sourceYANG Ningning

  

  1. Measurement and Control while Drilling Technology Center of Sinopec Oilfield Service Corporation, Dongying 257078, China
  • Received:2019-12-09 Revised:2020-02-12 Online:2020-04-15 Published:2020-04-20
  • About author:YANG Ningning, female, born in 1980, graduated from China University of Petroleum (Hua Dong) with a master's degree in 2009, focusing on measurement and control while drilling technology
  • Supported by:
    National Science and Technology Major Project(2016ZX05021-001);the National Key Research and Development Program of China(2016YFC0302802)

Abstract: Background

In neutron porosity logging, different response exists when use D-T source to replace chemical source to measure porosity, which makes the experimental data and interpretation model of traditional chemical source neutron porosity logging difficult to apply.

Purpose

This study aims to verify whether the existing density correction method can approximate the response of neutron porosity logging with D-T source instead of chemical source.

Methods

First of all, response results of water saturated limestone formations with different porosity and different mudstone were obtained by simulation calculation using Monte Carlo N-Particle Transport Code (MCNP), and benchmarked the simulation results with the experimental device measurements. Then these differences among D-T source’s raw data, the D-T source’s corrected data and chemical source’s data were compared and analyzed. Finally, actual logging data were used to validate the effectiveness of the controlled source applicable to neutron porosity logging.

Results

After density correction, the results of porosity logging of the controlled source are similar to that of the chemical source, and good correspondence between the two results are found in their actual logging curve.

Conclusions

This study has certain application significance for verifying the validity of control source for neutron porosity logging and the compatible substitution of radioactive sources in future logging tools.

Key words: Neutron porosity logging, D-T source, Density correction, MCNP, Logging curve

CLC Number: 

  • P631.81