多孔介质中水合物的热物理参数测量

利用时域反射技术和非稳态热线法测量热物理特性技术,设计制作了一套用于高压状态下测量含水合物沉积层热物理参数的系统。选择粒级(?)0.18～0.25 mm的细砂作为多孔介质,加入0.3g/L十二烷基硫酸钠(SDS)溶液作为多孔介质中的孔隙水和甲烷气体(纯度为99.9%),模拟沉积物中水合物的生成过程。采用交叉热线法和平行热线法两种方法测量了含水合物沉积层中的导热率,交叉热线法导热率的测量结果为(1.112±0.080)W/(m·K),平行热线法导热率的测量结果为(1.078±0.057)W/(m·K)。

Measurement of Thermal-Physical Parameters of Gas Hydrate in Porous Media

Based on the time domain reflection technique and transient hot-wire thermal-physical measurement technique,a gas hydrate experimental equipment has been designed to measure the thermal-physical properties of gas hydrate in porous media under high pressure.Hydrate is synthesized in porous media which particle size is between 0.18～0.25 mm,and 0.3 g/L sodium dodecyl sulfate (SDS) is added into the system as surfactant. The gas source is methane (99.9%).The thermal-physical properties of hydrate were detected in the sediment layers.The heat conduction rate measured by cross hot-wire method is (1.112±0.080) W/(m·K) and the result measured by parallel hot-wire method is (1.078±0.057) W/(m·K).