The Prediction Model Examination Of Gas Hydrate In The Deep-water Oil And Gas Field Development

In order to solve a series of hydrate plugging problems caused in oil operations, as well as to better develop natural gas hydrate resources, rational use hydrate technology, to a certain extent, whether forecasts of temperature and pressure of hydrate formation condition more accurate became critical.In this paper we examined a variety of hydrate prediction methods,We chosed the molecular thermodynamics pure model of gas hydrate vdWP model which is builded basing on phase equilibrium theory and applying statistics thermodynamics. And we selected Du-Guo model to calculate Langmuir constant, to predict gas hydrate formation conditions in pure water system. Nasrifar et al model was usd as an improved method to calculate hydrate formation conditions of the system with methanol or (and) the presence of sodium chloride ,and used that as the basic model, then based on our experiments, through experimental data analysis,We proposed an effective equivalent concentration theory, and thus the theory as a guide, part of the inorganic salts, polyol and a series of oilfield chemicals with the methanol or the concentration of sodium chloride equivalent relationship was established, and a new simple and fast high accuracy of hydrate prediction methods could be used in wide range was proposed.And The paper draws up forecasting software of gas hydrate formation on the bases of theory and experiment studies. In view of adding inhibitor of different concentration with different concentration and different natural gas component, the software can provide the forecasting calculation of hydrate formation temperature and pressure.After the completion of all of the above, we using the high-pressure reactor hydrate laboratory experiments verify some of the more representative material of the formation of hydrate, and compared with this prediction result and with the high precision Sloan commercial hydration forecasting software , comparative analysis shows that the theory of the relative equivalent concentration presented in this paper is feasible and the procedure is reliable for forecasting.