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A new gamma density measurement method for cased-hole formation evaluation.

Qiong Zhang¹, Yulian Li¹, Ya Jin²

¹University of Electronic Science and Technology of China, China.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine

|April 2, 2022

Summary

This study introduces a new gamma density measurement method for cased-hole formation evaluation. It accurately determines formation density even with uncertain cement conditions, reducing operational risks.

Keywords:

Cased hole formation evaluation Cement invasion impact Gamma density logging

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Area of Science:

Petroleum Engineering
Geophysics
Well Logging

Background:

Cased-hole formation evaluation is crucial for reducing downhole risks.
Thru-casing gamma density measurement faces challenges due to gamma penetration and cement evaluation difficulties.

Purpose of the Study:

To develop a novel gamma density measurement method for complex cased-hole conditions.
To accurately assess formation density and cement properties, even when cement is uncertain.

Main Methods:

Constructed an extensive Monte Carlo modeling database for a 4-detector gamma density tool.
Developed a fast forward detector response model to correlate detectors with environmental parameters.
Created an inverse formation model incorporating a novel cement invasion model for density and cement evaluation.

Main Results:

Verified the method's correctness using modeled data.
Applied the method to an offshore well, referencing open-hole density logs.
Achieved accurate density measurements in areas with uncertain cement conditions.

Conclusions:

The proposed gamma density measurement method effectively addresses challenges in cased-hole evaluation.
Accurate formation density can be obtained despite uncertain cement conditions.
The method enhances the reliability of formation evaluation in complex well environments.