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为研究不同水合物藏饱和度对注热开采动态的影响,采用自制的一维天然气水合物(NGH)开采模拟实验装置,模拟地层多孔介质的条件,首先在填砂模型中生成不同饱和度的NGH,然后进行注热盐水分解实验。结果表明:不同饱和度的NGH注热分解产气都可划分为三个阶段,不同的是NGH饱和度越高,水合物分解阶段的产气速率越大,且该阶段持续的时间越长;NGH饱和度越高,注热分解阶段电阻率增大的幅度越大,系统各测点温度升高的幅度越小。注热分解过程中产水速率围绕注水速率而上下波动,且NGH饱和度越高,产水速率波动幅度越大;在实验研究范围内,随初始水合物饱和度的升高,注热开采的能量效率逐渐升高。因此,从能量效率来说,高饱和度的水合物藏更适宜于注热开采。
In order to study the influence of different hydrate saturation on the dynamic characteristics of injection heat recovery, a homemade one-dimensional natural gas hydrate (NGH) mining simulation experiment device was used to simulate the conditions of formation porous media. First, different saturations NGH, followed by heat-saline salt decomposition experiment. The results show that NGH with different saturations can be divided into three stages by gas injection pyrolysis, except that the higher the NGH saturation is, the higher the gas production rate in the hydrate decomposition stage and the longer the duration of the gas phase. The higher the saturation of NGH, the greater the increase of resistivity in the pyrolysis decomposition phase, the smaller the temperature rise of each measuring point of the system. During the pyrolysis process, the water production rate fluctuated around the water injection rate, and the higher the NGH saturation, the greater the fluctuation rate of the water production rate. Within the experimental range, with the increase of initial hydrate saturation, the energy of heat injection Efficiency is gradually increasing. Therefore, from the point of view of energy efficiency, highly saturated hydrate reservoirs are more suitable for heat injection mining.