Study On The Formation Conditions Of Natural Gas Hydrate

Gas hydrate formation during exploitation and transportation is a well recognizedoperational hazard. It can impose serious accidents such as the choke’s plugging, the gas well’soff production. In order to avoid gas hydrate plugging the equipment, general gas hydrateforecast model is needed.The various thermodynamic models were analyzed and studied in this paper,finally usingthe Du-Guo Model which was based on van der Waals-Platteeuw Model and the Chen-GuoModel to compute gas hydrate’s formation conditions for pure water system, Peng-Robinsonstate equation was used to calculate the fugacity. As a result, a better thermodynamic model wasestablished. Nasrifar Model was applied to predict hydrate’s generating temperature by givingpressure for inhibitors system(electrolyte or alcohol); Highly accuracy Javanmardi Model wasapplied to predict hydrate’s generating temperature by giving pressure for inhibitorssystem(electrolyte and alcohol). The gas with different components were calculated andpredicted by using JAVA programming language and the results showed that the mathematicalmodel was accurate. Comprehensive consideration, the prediction accuracy of Chen-Guo modelwere better than Du-Guo model. Through a detailed analysis of forecast data, relevantconclusions were summerized:for the system with inhibitor,under the same pressure,thegenerating temperature of the same component reduced dramatically. At the same time,this paperestablished the natural gas pipeline thermodynamic and hydraulic model. Combined with theprediction model, the hydrate’s initial formation position can be predicted, it can offer necessarytechnical support to the prevention of natural gas hydrate.