井下发电机系统性能优化

发布时间：2018-06-03 22:54

本文选题：发电机 + 转速　；参考：《东北石油大学》2017年硕士论文

【摘要】：根据井上GW-LWD随钻仪器的使用情况,主要通过两个方面,对井下发电机系统进行优化设计。首先,研究井下发电机转速控制的方法,分析影响发电机转速的因素,并总结出发电机转速的控制方案,针对现场试验得出的数据,结合井下施工时出现的发电机故障进行分析,通过改变叶轮、流筒的机械结构,改变叶轮翼片弧度,导流器流道面积以及导流器叶片倾角等方法,对发电机系统进行改进后,再经过多次井下试验,总结分析数据,并与改进前的参数进行比对分析,从而实现对井下发电机系统的优化。其次,针对井下发电机的涡轮水力性能所起到的至关重要的作用,为了提高井下发电机涡轮的水力性能,采用有限元方法,通过Ansys Workbench—CFX进行数值分析,对不同的涡轮结构分别进行建模、划分网格、计算分析,指出现有设计的缺陷,提出改进的意见。分析结果表明,随着叶片入口和出口角度的减小,流体动能转化率越高。但涡轮在额定流量下转速偏高且气穴现象严重,需要适当增大该角度。并进行一系列室内试验研究,通过性能试验,验证改造后的涡轮水力性能。
[Abstract]:According to the use of GW-LWD on well drilling instrument, this paper optimizes the design of downhole generator system through two aspects. First of all, the method of downhole generator speed control is studied, the factors influencing generator speed are analyzed, and the control scheme of generator speed is summarized. Combined with the analysis of generator faults in underground construction, the generator system is improved by changing the mechanical structure of impeller and flow tube, changing the arc of blade of impeller, the area of flow channel of flow guide and the inclination angle of blade, etc. After several downhole tests, the analysis data are summarized and compared with the parameters before the improvement, so as to realize the optimization of the downhole generator system. Secondly, in order to improve the hydraulic performance of the downhole generator turbine, the finite element method is adopted and the numerical analysis is carried out by Ansys Workbench-CFX in order to improve the hydraulic performance of the downhole generator turbine, which plays an important role in the turbine hydraulic performance of the downhole generator. The different turbine structures are modeled, meshed, calculated and analyzed, the defects of the existing design are pointed out, and some suggestions for improvement are put forward. The results show that with the decrease of blade inlet and outlet angles, the kinetic energy conversion is higher. However, the turbine speed is higher and the cavitation phenomenon is serious under rated flow rate, so it is necessary to increase the angle properly. A series of laboratory tests were carried out to verify the hydraulic performance of the modified turbine.
【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;TM31

【参考文献】