油气水复合式分离器样机实验

Prototype tests of the combined oil-gas-water separator

本文介绍了油气水分离技术方面的研究工作，分析了复合式油气水分离器的核心部件螺旋管和T型管对分离器性能的影响和作用，以及螺旋管侧壁开孔的大小、数量和位置的影响。通过试验得出适当增加hid的值，如h/g=20，直管直径为DN40，高度900，在大粘度下分离效果更好。联合实验表明，对一定配比的油水混合液（含水率60—80％）经T型管、螺旋管分离后，油中含水可小于1％。

This paper describes the research works on oil-gas-water separating techniques for the joint project between Institute of Mechanics of Chinese Academy of Sciences and Research Center of China National Offshore Oil Corporation during the ＂Tenth-five-year＂ period. The combined separator prototype with a 1/10 scaling factor and a maximum daily handling capacity of 250m^3/d is designed and fabricated based on experiments and numerical simulations at Institute of Mechanics. As key components of the combined oil-gas-water separator, the helical and T-shaped pipes are very important for the separator qualifications of capacity, size and reliability. Therefore single and joint experiments are carried out respectively to verify the separating effect. The helical pipes adopt the principle of centrifugation separation which primarily depends on the magnitude of U^2/Rg. By this way the water content in oil can be reduced 15%-30%. The sizes, number and positions of the holes located in the side wall of helical pipes are also important factors affecting the oil-water separation. Employing proper aperture gradient distributions and angles, i.e. the hole parameters matching with the water outflow process, a better separation result can be obtained. The T-shaped pipes adopting the principles of gravitation and expansion separation pre-separate the gas-liquid and liquid-liquid mixtures, and the separation effect is mainly determined by the diameter, height and number of the vertical pipes. Through experimental researches it is concluded that increasing the value of h/d properly, for example h/d of 20, with a straight pipe diameter of DN40, a height of 900 and a high viscosity, the separation effect can be achieved. For the oil-water mixtures with certain mixture ratios （water content 60-80%）, the joint experiment results of water-in-oil ratio less than 1% can be obtained following the procedure of T-shaped pipes pre-separating, helical pipes separating and gravitational settling.