ENVIRONMENTAL ASPECTS OF COMBINED DEPRESSURIZATION AND ELECTROMAGNETIC HEATING METHOD FOR HYDRATE EXTRACTION

Vollständiger Abstract

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Deep-sea natural gas hydrate resources have attracted widespread attention as a new type of energy source, and how to develop natural gas hydrates safely and effectively is currently the focus of research. The most commonly used extraction method for deep-sea natural gas hydrates is the depressurization method, but it faces problems such as the formation of secondary hydrates in the wellbore during the later stages of extraction. Therefore, we have incorporated electromagnetic heating technology into the depressurization extraction method. This method uses electromagnetic heating to controllably raise the temperature inside the wellbore, effectively inhibiting and eliminating the formation of secondary hydrates and ensuring unobstructed flow channels within the wellbore. Compared with traditional methods, electromagnetic heating technology has advantages such as fast response speed, uniform heating, and ease of control, solving the problem of secondary hydrate formation in the wellbore. Furthermore, no chemical additives are injected during the entire process, avoiding the risk of marine ecological pollution caused by chemical additive leakage.This paper analyzes this from the following four perspectives: Chemical Pollution Risk: The deep-sea natural gas hydrate extraction method combining depressurization and electromagnetic heating not only efficiently solves the key production problem of secondary hydrate blockage in the wellbore, but also eliminates the risk of chemical pollution at its source by completely abandoning the injection of chemical inhibitors. Greenhouse Gas Leakage Risk: The deep-sea natural gas hydrate extraction method combining depressurization and electromagnetic heating reduces the risk of methane escape and leakage through precise control, demonstrating irreplaceable advantages in greenhouse gas emission reduction and environmental protection. Reservoir Stability and Geological Hazard Risk: This method allows for more precise and efficient control of heat input during depressurization, significantly reducing heat loss while minimizing disturbance to the overall formation. This ensures continuous hydrate decomposition efficiency while minimizing the potential geological risks caused by drastic changes in temperature and pressure fields. Marine Flora and Fauna: This method not only offers higher recovery efficiency but also represents an environmentally friendly extraction approach with minimal disturbance to marine flora and fauna and the lowest risk of acidification. Therefore, compared to traditional single extraction methods, the combined depressurization and electromagnetic heating method significantly improves extraction efficiency and greatly enhances safety from an engineering perspective. From the perspective of marine ecological environment protection, it greatly reduces the disturbance to the seabed ecosystem while maximizing the protection of the marine ecosystem's safety.