深水SDPSO平台油水置换储油舱模型尺度影响研究

Technical Study of Oil-Water Replacement for SDPSO Oil Tank Model

为探究深水SDPSO平台油水置换储油舱的模型尺度影响,定义了原油在水中的“扩散强度”参数y,进行 试验研究的缩尺设计和数据分析,采用三种原油、三种缩尺模型进行了室内油水置换试验.研究发现,模型 缩尺比的减小强化了油水置换中原油向海水的传质和原油对舱壁的传热过程,对油水置换工艺产生不利影 响.置换排出水的平均含油浓度与模型的缩尺比呈正相关,与原油中密度大于海水的沥青质含量呈负相关, 与原油密度无关.结合实际生产的特点,测量油水界面的厚度小于储油舱高度的1%.结合温度数据的处理, 验证了高凝原油因模型舱缩尺比减小而导致的严重“舱壁凝油”问题,该问题对SDPSO平台油水置换储油工 艺的制约性大于“油水界面”问题以及“置换水含油浓度”问题.

In order to explore the scale effect of the oil-water replacement oil tank model for SDPSO Platform, parameter y for describing the diflEusion intensity of crude oil in water was defined to conduct shrinkage scale design and data analysis . Three kinds of crude oil and three scale models were performed to simulate oil-water replacement in the laboratory. It was found that the model scale contraction would strengthen crude oil mass transfer to sea water and heat transfer to the bulkhead, as well as generate negative effects on oil-water replacement. Average oil concentration in discharged water is not related to the density of oil , but positively related to the model scale,and negatively related to the content of asphaltene in the oil that heavier than seawater. According to the production practice , it was measured that the thickness of the oil-water interface was lower than 1% of the tank height. Through processing of temperature data, it was validated that the model scale amplification of high pour point oil would contribute to severe oil-adhering on the bulkhead, which might put more restriction on the development of SDPSO platform than on oil-water interface problem or oil concentration in dischaiged water problem.