Study of Gas Migration in the Fissures of Closed Goaf and Production Characteristics in Vertical Wells under Different Gas Injection Conditions
Publication: Journal of Energy Engineering
Volume 150, Issue 4
Abstract
Gas injection displacement is a widely used technique to enhance the recovery of coal methane () or oil reservoirs. Additionally, this method plays a crucial role in effectively developing resources in a closed goaf. In the present study, the distribution characteristics of fissures in a closed goaf were determined using a physical simulation test, and the connected fissure network was extracted and modeled. Further, extraction numerical simulation tests were conducted on the connected fissure network under gas injection conditions. The migration and distribution characteristics of were analyzed in the connected fissure network under different gas injection conditions, including gas injection position, gas injection rate, and gas injection type. The research also evaluated the impact of different gas injection conditions on production in vertical wells. Finally, a model was developed to determine characteristic parameters for production in vertical production wells, which were calculated and compared across different gas injection conditions. Results revealed a negative correlation between volume fraction and gas injection time in vertical wells under different gas injection conditions, contrary to the S-type growth curve. Gas injection positions significantly influenced the migration and distribution of gas within the connected fissure network, with higher productivity and production efficiency in the gas injection position compared to . The increase in the gas injection rate enhanced production efficiency, albeit having little effect on productivity. Gas injection types yielded no significant influence on production efficiency, although productivity was lower with 100% injection compared to 100% and mixed gas. This investigation provides the foothold for enhancing the recovery of in closed goafs and contributes to the progress of carbon emission reduction technology in coal mining areas.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (No. 52074217) and the Natural Science Basic Research Program of Shaanxi Province (No. 2021JLM-26).
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Information & Authors
Information
Published In
Journal of Energy Engineering
Volume 150 • Issue 4 • August 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Nov 28, 2023
Accepted: Feb 19, 2024
Published online: May 22, 2024
Published in print: Aug 1, 2024
Discussion open until: Oct 22, 2024
ASCE Technical Topics:
- Business management
- Chemicals
- Chemistry
- Continuum mechanics
- Cracking
- Energy engineering
- Energy infrastructure
- Energy sources (by type)
- Engineering mechanics
- Environmental engineering
- Fracture mechanics
- Fuels
- Gas pipelines
- Groundwater
- Infrastructure
- Injection wells
- Lifeline systems
- Methane
- Natural gas
- Non-renewable energy
- Organic compounds
- Personnel management
- Petroleum
- Practice and Profession
- Productivity
- Solid mechanics
- Water (by type)
- Water and water resources
- Water management
- Wells (oil and gas)
- Wells (water)
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