【摘要】：目前,我國氣井積液的現(xiàn)象已經(jīng)十分普遍。對于有些已經(jīng)積液的氣井來說,通過采用排液采氣工藝可以繼續(xù)生產(chǎn)。渦流排采工藝是一種新型的排液采氣工藝,國內(nèi)雖已有所使用,但相關(guān)研究較少。本文通過建立數(shù)學模型,得出渦流排液采氣工藝的工作原理及其作用長度的計算方法。同時以2-7/8時油管作為使用環(huán)境,對不同的工藝參數(shù)、幾何參數(shù)進行模擬分析,最后根據(jù)氣井常見工況及常用排液采氣工藝,編譯了氣井排液采氣工藝判別軟件。在理論計算研究中,對渦流裝置前后的流態(tài)進行分析,通過對比裝置前后的臨界攜液速度,證明了使用該裝置后,氣體臨界攜液速度減小了8-16%,從而提高了氣井的排液能力；使用渦流衰減模型和液滴剝落模型,推導并對比了兩種模型的作用距離,確定了渦流裝置單級作用長度的計算方法。在模擬分析中,以2-7/8時油管作為使用環(huán)境,得出結(jié)論：液滴粒徑的增加、入口速度的增加、產(chǎn)氣的持液率的增加、井下壓力的增加、氣體密度的減小,在一定程度上都有益于液滴分離效率的提高,其中氣體密度對氣液兩相的分離效果影響最大；對于2-7/8的低產(chǎn)氣井,導程數(shù)為1.5、螺旋角度為700、內(nèi)柱直徑為45mm時渦流裝置使用效果較好。
[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.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE37

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