Study On Flow Field Characteristics Of Oil-Gas-Water Three-Phase Separation Hydrocyclone

Aiming at the condition of oil bearing and gas bearing oilfield sewage, inner conical oil-gas-water three-phase hydrocyclone is designed and researched in this paper. The method of combining the theoretical analysis, numerical simulation, and experimental research is adopted. The separation property and flow field characteristics of deoiling and degassing hydrocyclone are studied. The initial model of the hydrocyclone is modeled by using theoretical analysis method, the dimensional parameters and inlet flowrate of the hydrocyclone are optimized by using numerical simulation method, the optimum operation parameters of the hydrocyclone are determined by using experimental research finally, the rationality of the inner conical structure for oil-gas-water three-phase separation, and the experimental study further proved the correctness of model choice and the feasibility of parameter optimization according to numerical simulation method.By using the Fluent software, numerical simulation for the initial model of the hydrocyclone was first carried out., and the distribution law of flow field was analyzed, concluding the density distribution law of gas and oil, the velocity distribution law, and the pressure distribution law etc.; the improved scheme was made and the structure improving analysis of the whirl cavity, the internal cone, the overflow mouth and the inlet flowrate was carried out, because of the structure defects of the initial model, then the final structure and the inlet flowrate was determined.According to the final structure dimensions, the prototype processing was completed. By the experimental study, the effect of the inlet flowrate, the inlet gas-liquid volume ratio and the split ratios on separation effects were made clear, and remarkable effect of the de-oiling and de-gassing hydrocyclone was further proved, the feasibility of numerical simulation for optimizing design was also approved.The parameters optimum seeking design of inner conical structure using for oil-gas-water three-phase separation was completed, the feasibility of this structure using for three-phase separation was proved. This work provides a new thought for de-oiling and de-gassing treatment of wastewater, and provides a beneficial reference for the design of high efficient de-oiling and de-gassing device.