同井注采井下分离管柱的力学分析及关键部件优化

发布时间：2018-05-15 05:02

本文选题：井下油水分离 + 力学分析　；参考：《东北石油大学》2017年硕士论文

【摘要】：井下油水分离系统因具有结构紧凑、运行空间小、分离时间短等优点,正逐步成为国内外各大石油企业所采用的油田开采技术。本文简要介绍了井下油水分离系统的研究进展以及管柱面临的技术难点,结合我国高含水油田、小尺寸采油套管的开采现状,提出了一种新型的井下油水分离系统。本文选取具体使用工况下的同井注采井下管柱为研究对象,对井下油水分离系统进行设计研究,包括油水分离分系统设计、动力分系统设计、采出层与注入层封隔工艺技术,并对其进行室内试验研究;在综合考虑同井注采工艺流程和多项影响因素的基础上,建立井下油水分离管柱的力学模型,通过计算管柱核心部分的受力和变形情况,分析得出井下分离管柱的载荷,并对井下分离管柱进行有限元建模及理论分析;依据井下分离管柱的工程实际,开展了井下分离管柱的模态分析,根据得出的固有频率和振型预测了管柱的实际振动响应和结构设计的薄弱部位;然后开展了螺杆泵周期性偏心载荷作用下的管柱谐响应分析,得出其位移响应曲线,获得了井下分离管柱结构位移等力学参数随频率的变化规律;进行了管柱工作过程中电机启停下的瞬态动力学分析,得出管柱的位移动态响应规律和应力、变形的分布。结合管柱力学分析结果,对井下分离管柱中的旋流分离器上端连接部件和止推机构底轴等关键部件进行极限载荷计算,及实际载荷作用下的结构强度评价,进而对关键部件进行结构优化;并根据脱接器现有问题,进行了分析优选,保证了同井注采管柱长期运行过程中的可靠性。
[Abstract]:Due to the advantages of compact structure, small operation space and short separation time, the downhole oil-water separation system is gradually becoming the oilfield production technology adopted by large oil enterprises at home and abroad. This paper briefly introduces the research progress of downhole oil-water separation system and the technical difficulties faced by tubing string, and puts forward a new downhole oil-water separation system combined with the present situation of production of small size casing in high water-cut oil field in China. In this paper, the downhole tubing string in the same well is selected as the research object, and the downhole oil-water separation system is designed and studied, including the design of oil-water separation subsystem, the design of power subsystem, and the sealing technology of the produced and injected layers. The mechanical model of downhole oil-water separation string is established on the basis of comprehensive consideration of the same well injection and production process and many influencing factors, and the stress and deformation of the core part of the string are calculated. The load of the downhole separation string is obtained, and the finite element modeling and theoretical analysis of the downhole separation string are carried out, and the modal analysis of the downhole separation string is carried out according to the engineering practice of the downhole separation string. According to the natural frequencies and modes obtained, the actual vibration response of the pipe string and the weak part of the structural design are predicted, and then the harmonic response analysis of the pipe cylinder under the periodic eccentric load of the screw pump is carried out, and the displacement response curve is obtained. The variation law of mechanical parameters such as structural displacement of underground separation string with frequency is obtained, and the transient dynamic analysis of motor start and stop during the working process of string is carried out, and the dynamic response law of displacement and the distribution of stress and deformation of string are obtained. Combined with the results of mechanical analysis of pipe string, the ultimate load of the upper end connecting parts of cyclone separator and the bottom shaft of thrust mechanism in the downhole separation string are calculated, and the structural strength under actual load is evaluated. Then the structure of the key components is optimized and the reliability of the injection and production string in the same well is ensured by analyzing and selecting according to the existing problems of the detacer.
【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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