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Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses

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Gas Loss Compensation Method for Prolonged Exposure Samples from Deep Boreholes: Experiment, Theory, and Numerical

Guangshan Shi^1,2, Tao Wei¹, Yanwei Liu^1,2

¹School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China.

|June 29, 2026

Summary

This summary is machine-generated.

New methods accurately estimate coal seam gas loss during prolonged sampling. The Dynamic Point Tangent Method (DQSB) improves upon the Initial Measurement Point Tangent Method (CQSB) for safer mining and better methane reserve assessment.

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Published on: June 12, 2019

Area of Science:

Geosciences and Environmental Science
Mining Engineering
Petroleum Engineering

Background:

Accurate coal seam gas content is vital for mine safety and coalbed methane reserve assessment.
Extended borehole depths for gas determination limit sampling times, challenging existing gas loss compensation methods.
Current methods inadequately estimate long-duration gas loss due to reliance on initial desorption data.

Purpose of the Study:

To develop a transient gas diffusion model incorporating adsorption effects for long-term gas loss estimation.
To propose novel gas loss compensation methods suitable for prolonged coal sample exposure.
To provide accurate gas loss estimation for deep borehole drilling and sampling.

Main Methods:

Established a transient gas diffusion equation with gas adsorption effects.
Analyzed the relationship between dimensionless time (T) and dimensionless desorption quantity (Y).
Developed and compared the Initial Measurement Point Tangent Method (CQSB) and the Dynamic Point Tangent Method (DQSB).

Main Results:

The developed diffusion model accurately characterizes long-term gas diffusion.
The T-Y relationship follows a power-law function, with exponent variability causing errors if fixed.
CQSB is accurate for short exposure times (<2 min), while DQSB accurately estimates gas loss for prolonged exposure (3-30 min).

Conclusions:

The Dynamic Point Tangent Method (DQSB) offers a significant improvement for estimating gas loss under extended exposure conditions.
This research provides a new approach for gas loss estimation in deep drilling and sampling processes.
Further research is needed to theoretically determine the dynamic point location and validate the method for fractured coal samples.