The Study Of Physical Simulation On The Exploitation Of Natural Gas Hydrates

At present, Natural Gas Hydrates (NGH), is known as a high-quality, clean, and potential energy source, and its reserves is almost two times of the total reserves in all fossil fuels (coal, oil and natural gas) in the world. NGH has wide application and development foreground and it has a pivotal function to relax the energy crisis of human faced. So, the development and utilization of NGH resources is necessary.At first, the structure, formation condition, resources distribution, thermodynamical property, the course of study and the trend of NGH development are introduced in this paper, then the research status of the experimental methods for NGH physical simulation are presented at home and abroad, finally, the "Simulating Equipment of Natural Gas Hydrates Exploitation" with independent intellectual property rights was designed. It is convenient to use and the accurate and reliable test date can be gotten by this NGH physical simulation equipment.The physical simulation testing principle, operating procedure, technical indexs designing of the important measuring parameters and main faculties of the NGH physical simulation experimental apparatus were introduced adequately. In addition, the design of software including the system design and the major function module were also introduced adequately in the paper. After the practical application, through the experimental data and the results of collecting images, it was indicated that this experimental system had the advantages of easy operating and the superiority.The innovations and advantages of the NGH physical simulation experimental apparatus were performed in several ways of the following:(1) In the pressure control aspect, use the increasing PID algorithm, combining the equipment of single chip and stepper motor with high pressure cut-off valve to build a set of pressure control system, which provided a new approach for the process of pressure control.(2) The reaction vessel was made of stainless steel on which two opposite observing windows were set by high-strength frp as for recording the whole process of NGH formation and decomposition through the camera in the condition of parallel lightsources at the observing windows provided by fiber.(3) There were total of 12 temperature probes uniformly distributed on one single plane ofthe inner low-temperature storage tank. The plane could be adjusted up and downwhich could be able to monitor the change of temperature field in the storage tankduring the experiment of NGH physical simulation process.The NGH physical simulation experimental apparatus was a set of completely experimental system of the self-designing knowledge authority and the advanced technology to integrate the process of data and images collecting perfectly. With this system, the process of NGH formation, the change of pressure, temperature and images collecting ,etc. could be recorded effectively, which provided important theoretical support for further study of NGH developing.