井下油水分离器改型设计及流场数值模拟研究

发布时间：2018-01-26 02:16

本文关键词： 井下油水分离器数值模拟分离效率改型设计　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：同井注采技术已在大庆油田采油一厂的XXX口油井上得到了推广应用,取得了较好的稳油降水效果。但是,在近几年的推广应用中也出现了诸如容易发生堵塞和分离效率低等问题,直接影响到了这一技术的进一步推广应用。为了解决这些问题,必须对现有的同井注采配套技术中关键的井下油水分离器进行改型升级。在分析现有的油水分离器在应用中出现的问题进行详细分析的基础上,首先提出了环切模型、开槽模型、斜角模型、阶梯模型等多种“三杯同孔”改型设计方案,并对每种改型方案建立物理模型和数学模型,然后运用计算流体软件Fluent对流场进行数值模拟,对得到的流场的速度分布、压力分布等流场参数进行分析,分析各个改型方案的不足并加以修正;然后再结合油水分离器室内试验结果,提出了“小杯”改型方案;最后,提出了以最短停留时间不低于30秒和安全系数不小于2.5为限定条件的全新设计理念,重新编制了井下油水分离器的计算软件。与原有技术方案相比,油水分离效果提高60%以上,改型后的油水分离器长度可缩短50%以上,进液孔直径可增加20%以上,不但可以效地降低分离器的加工难度和造价,还可以进一步减小进液孔的堵塞带来的风险,为同井注采配套技术的推广应用提供了有力的技术支撑。
[Abstract]:The technology of injection and production in the same well has been popularized and applied in the XXX well of Daqing Oilfield No. 1 Oil recovery Plant, and has achieved a good effect of stabilizing oil and dewatering. In recent years, problems such as easy clogging and low separation efficiency also appear in the popularization and application of this technology, which has a direct impact on the further application of this technology. In order to solve these problems. It is necessary to upgrade the key downhole oil-water separator in the existing matching technology of injection and production of the same well, and on the basis of analyzing the problems in the application of the existing oil-water separator in detail. At first, this paper puts forward many kinds of "three cup same hole" design schemes, such as annular model, slotting model, inclined angle model, step model and so on, and establishes physical model and mathematical model for each kind of modification scheme. Then the flow field parameters such as velocity distribution and pressure distribution are analyzed by numerical simulation of flow field with Fluent software, and the shortcomings of each modified scheme are analyzed and corrected. Then combined with the results of the laboratory test of oil-water separator, the "small cup" modification scheme was put forward. Finally, a new design concept with minimum residence time of not less than 30 seconds and safety factor of not less than 2.5 is put forward. The calculation software of downhole oil-water separator is reprogrammed. Compared with the original technical scheme, the oil-water separation effect is improved by more than 60%, and the length of the modified oil-water separator can be shortened by more than 50%. The diameter of the inlet hole can be increased by more than 20%, which can not only effectively reduce the processing difficulty and cost of the separator, but also further reduce the risk caused by the plugging of the inlet hole. It provides a strong technical support for the extension and application of the matching technology of injection and production in the same well.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE931.2

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