Structural parameters optimization of microwave radiation antenna in hydrate reservoir based on multiphysical coupling model

Microwave heating has emerged as a promising technology in hydrate mining, attracting significant interest. This study focus on optimizing the structural parameters of microwave radiation antenna via a multiphysical coupling model. Subsequently the model is validated through experimental results. The microwave radiation simulation model is then developed to evaluate the antenna radiation performance and to elucidate the temperature distribution mechanism within the reservoir. The optimized structure features rectangle slots with an angle of 75° and a length of 28 mm. When this optimized antenna is deployed in a 1-m radius reservoir and heated for 10 h, it rises the average temperature from 2 °C to 7.11 °C. Moreover, the design improves the thermal uniformity within the gas hydrate reservoir, achieving a temperature standard deviation of 7.76 °C. Post-heating uniformity indicates effective microwave distribution. Overall, these results affirm that microwave heating, particularly when utilizing an optimized antenna, effectively enhances the reservoir's sensible heat and aids in hydrate decomposition.