涡流排水采气机理及应用研究

发布时间：2018-12-21 09:24

【摘要】：目前,我国气井积液的现象已经十分普遍。对于有些已经积液的气井来说,通过采用排液采气工艺可以继续生产。涡流排采工艺是一种新型的排液采气工艺,国内虽已有所使用,但相关研究较少。本文通过建立数学模型,得出涡流排液采气工艺的工作原理及其作用长度的计算方法。同时以2-7/8时油管作为使用环境,对不同的工艺参数、几何参数进行模拟分析,最后根据气井常见工况及常用排液采气工艺,编译了气井排液采气工艺判别软件。在理论计算研究中,对涡流装置前后的流态进行分析,通过对比装置前后的临界携液速度,证明了使用该装置后,气体临界携液速度减小了8-16%,从而提高了气井的排液能力；使用涡流衰减模型和液滴剥落模型,推导并对比了两种模型的作用距离,确定了涡流装置单级作用长度的计算方法。在模拟分析中,以2-7/8时油管作为使用环境,得出结论：液滴粒径的增加、入口速度的增加、产气的持液率的增加、井下压力的增加、气体密度的减小,在一定程度上都有益于液滴分离效率的提高,其中气体密度对气液两相的分离效果影响最大；对于2-7/8的低产气井,导程数为1.5、螺旋角度为700、内柱直径为45mm时涡流装置使用效果较好。
[Abstract]:At present, the phenomenon of gas well fluid accumulation in China is very common. For some gas wells that have accumulated fluid, production can be continued by using the drainage gas recovery process. Eddy current extraction process is a new type of liquid extraction and gas recovery process, although it has been used in China, there are few related studies. In this paper, a mathematical model is established to obtain the working principle and the calculation method of the acting length of the vortex gas extraction process. At the same time, using 2-7 / 8 tubing as the operating environment, the different process parameters and geometric parameters are simulated and analyzed. Finally, according to the common working conditions of gas wells and the commonly used drainage gas production technology, the discriminant software of gas recovery technology is compiled. In the theoretical calculation, the flow state before and after the eddy current device is analyzed. By comparing the critical liquid carrying speed before and after the device, it is proved that the critical liquid carrying velocity of the gas decreases by 8-1616 after the use of the device. Thus, the drainage capacity of gas wells is improved. Using the eddy current attenuation model and the droplet spalling model, the working distance of the two models is deduced and compared, and the calculation method of the single stage action length of the eddy current device is determined. In the simulation analysis, when the tubing is used at 2-7 / 8, it is concluded that the increase of droplet diameter, the increase of inlet velocity, the increase of gas holdup, the increase of downhole pressure, and the decrease of gas density. To some extent, it is beneficial to the improvement of the separation efficiency of liquid droplets, in which the gas density has the greatest influence on the separation effect of gas-liquid two-phase. For 2 / 7 / 8 low production gas wells, the eddy current device works better when the lead number is 1.5, the spiral angle is 700, and the diameter of the inner column is 45mm.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE37

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