海底天然气水合物绞吸式开采方法研究

 根据海底天然气水合物藏特点，结合绞吸式挖泥船工作原理和大洋多金属结核开采技术，提出了一种全新的绞吸式海底天然气水合物开采方法，克服了海底天然气水合物开采依赖构筑封闭开采环境的技术瓶颈；然后根据管道输送原理和两相流理论，对绞吸式开采方法的提升系统进行了水力参数分析。由分析结果可知，将体积浓度为15%~25%天然气水合物流体从1 000 m海底提升到海面所需泵的扬程为30~50 m；将体积浓度为10%~20%天然气水合物流体从4 000 m海底提升到海面所需扬程为90~150 m，现有的矿浆泵就能满足要求；由于天然气水合物和海底沉积物硬度较低，并且其混合流体的密度与海水密度相差不大，采用矿浆泵进行直接输送其对泵的磨损不会严重，能保证系统长期稳定的工作，证明了该开采方法在理论上是可行的。

Cutter-suction Exploitation Mode of Marine Gas Hydrate

According to the characteristic of submarine gas hydrates and combining the working principle of Cutter Suction Dredger and the exploitation technique of the polymetallic nodule mining in ocean,a new exploitation mode named cutter-suction marine gas hydrate was proposed and used to resolve the technology bottleneck restrict that the gas hydrates under the sea couldn't be exploited without a close exploiting environment.And then based on the pipeline transporting principle and the two-phase flow theory,the h...