井下油水分离管柱内空间结构优化

发布时间：2018-04-05 14:21

本文选题：井下油水分离　切入点：旋流器　出处：《东北石油大学》2015年硕士论文

【摘要】：本文通过对两级旋流器串联工艺进行研究,分析溢流流道对旋流器出口总产油量的影响,并且分别针对流道的三个关键结构位置初步提出了四种优化方案,即:不等径环空流道结构优化,两级汇总处相贯结构优化,两级汇总处喷管结构以及两级连接处新型结构。利用计算流体动力学(CFD)方法,Gambit软件进行模型建立、Fluent软件进行数值模拟分析,得到原始结构的井下油水分离管柱内两级串联溢流流道的流场情况,通过流场中反映出来的造成流场不稳及影响出流的结构位置提出优化方案。四种优化方案的模拟结果与原始结构流道进行对比,均采用局部结构变化而其它位置参数不变的规律,分析其优化结构得到出油率、油相质量分率以及速度场的流场分布情况,进而来验证方案的可行性。以往针对于提升油水分离效果多是考虑旋流器部分的设计,往往忽略了经过分离后的流液在流道传送过程中可能造成的滞留、难于汇总等出流问题,因此,本文着重研究流液经旋流器溢流管排出后,流道的结构布局对出流的影响;且尝试拉伐尔喷管结构应用于井下油水分离管柱内流道中。结果表明,四个优化方案中有三个方案在改进后的流道流场更稳定,实现更好的出流,有助于提高原油产出量。通过进一步开展参数优选,有望取得更佳效果。
[Abstract]:In this paper, the influence of overflow channel on the total oil production of cyclone outlet is analyzed through the study of two-stage cyclone series process, and four optimization schemes are proposed for the three key structure positions of the channel.That is, the structure of annular channel with unequal diameter is optimized, the intersecting structure of two-stage aggregate is optimized, the nozzle structure of two-stage summation and the new structure of two-stage connection are optimized.By using the computational fluid dynamics (CFD) method and Gambit software, the fluent software was established to simulate and analyze the flow field of the two-stage series spillway in the oil-water separation pipe string with the original structure.The optimization scheme is proposed through the structural position which causes the instability of the flow field and affects the flow out of the flow field.The simulation results of the four optimization schemes are compared with those of the original structural channel. The local structure changes and other location parameters are not changed. The oil yield, the oil phase mass fraction and the flow field distribution of the velocity field in the optimized structure are analyzed.To verify the feasibility of the scheme.In the past, the design of hydrocyclone was always considered in order to improve the separation effect of oil and water, which often ignored the retention of separated fluid in the course of channel transport, which was difficult to sum up and so on.In this paper, the influence of the flow channel structure on the outlet flow is studied after the liquid is discharged by the cyclone overflow pipe, and the Laval nozzle structure is attempted to be used in the downhole oil-water separation pipe string.The results show that three of the four optimization schemes are more stable in the flow field of the improved channel and achieve better outflow, which is helpful to increase the output of crude oil.Through further parameter selection, it is expected to achieve better results.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE931.2

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