Design of Microwave Heating Device for Energy Replenishment in Natural Gas Hydrate Reservoir
Decreases of reservoir temperature,production rate and recovery efficiency are witnessed in the later stage of depressurization-induced natural gas hydrate exploitation.To solve these problems,a microwave heat-ing device for energy replenishment in reservoir has been designed.The device can replenish the energy in reservoir and provide the temperature and heat required for hydrate decomposition.In this paper,a simulation model of mi-crowave heating for energy replenishment in reservoir was established to identify the influence of different structural parameters of microwave antennas on the average electric field strength in the reservoir.Then,the structural pa-rameters of microwave antennas were optimized.The heating effect of the reservoir after microwave heating for 10 h under different microwave parameters was analyzed based on the optimized structural parameters.The simulation re-sults show that the optimal structural parameters of microwave antennas are as follows:elliptical notch,187 mm notch cycle,50 mm major axis,11 mm minor axis and 19° notch angle.When the microwave frequency is 1.5 GHz and the microwave power is 3 kW,after microwave heating for 10 h,the average temperature within a radius of 1 m of the hydrate reservoir is 10.43℃,which increases by about 5℃.The designed microwave heating de-vice for energy replenishment in reservoir can provide driving force for the decomposition of hydrates.The study re-sults enable the microwave heating technology to be applied in hydrate exploitation,and provide a new solution for the efficient development of natural gas hydrate.
natural gas hydratemicrowave heatingenergy replenishmentleaky coaxial antennareser-voir heating
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NSTL
万方数据
维普
