Research On The Recovery And Transportation Technology Of The Natural Gas Hydrate

The world is facing unprecedented energy resource crisis at present. Natural gas hydrate will become a potential new energy resource due to its large reserve and high energy density, and it is ranked as an alternative resources of the common oil and gas resources by the technology circle. Therefore, it is very important to research on the recovery of natural gas hydrate, which can provide theoretical support for the upcoming recovery of hydrate reserves. The recovery of natural gas hydrate is to break the balance of the stable exist of the natural gas through pressure reduction, heating etc. measurements, making it decompose into natural gas and water, then pump to the ground. During the recovery and transportation process of natural gas hydrate, the hydrates can form again in the well bore and pipeline due to the change of temperature and pressure, which will block the well bore or pipeline. The phase equilibrium of the natural gas hydrate is studied, the program predicting the natural gas hydrates formation is developed based on the Chen-Guo thermodynamic model, and the pressure and temperature relationship of forming the natural gas hydrate is also calculated. The temperature and pressure distribution during the hydrate recovery and transportation is calculated by the Beggs-Brill method and temperature distribution calculation model. The proper measurements of preventing the forming of hydrates are studied, which can guarantee the development of the natural gas hydrate resources. The results show that the forming of natural gas hydrate can be prevented through measurements such as reducing pressure, heating, adding inhibitor, etc., and the recovery of natural gas hydrate should be at proper pressure and temperature.