本文選題：井下節(jié)流 + 通用模型��； 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：近年來氣井井下節(jié)流工藝技術(shù)在低滲透氣田的開發(fā)中得到推廣應(yīng)用,對于有水氣田,隨著氣田的不斷開發(fā),產(chǎn)水氣井所占比例逐年增加,提前預(yù)測氣井的攜液能力,能夠判斷井底積液,對于氣井生產(chǎn)有著重要的意義。 本文對帶井下節(jié)流器的低產(chǎn)水氣井,考慮氣井生產(chǎn)過程中的積液現(xiàn)象,首先采用平均參數(shù)法和Cullender-Smith法利用井口套壓計(jì)算積液井井底壓力；采用Hagedorn-Brown垂直管氣水兩相流壓力計(jì)算方法計(jì)算油管內(nèi)壓力剖面；考慮氣井井筒徑向傳熱,計(jì)算氣井油管內(nèi)溫度剖面。利用Perkins模型,計(jì)算流經(jīng)節(jié)流嘴的壓降；根據(jù)節(jié)流前后焓值相等的特點(diǎn),并且基于相平衡理論,建立了節(jié)流溫降計(jì)算模型。文中以垂直氣井為研究對象,根據(jù)液滴質(zhì)點(diǎn)力平衡理論,認(rèn)為液滴在井筒中會發(fā)生變形,并考慮了液滴破碎時(shí)的最大尺寸,在綜合對比曳力系數(shù)及計(jì)算液滴變形參數(shù)的基礎(chǔ)上,建立了氣井連續(xù)攜液臨界條件的通用模型。對已有的攜液臨界流量計(jì)算方法和通用模型進(jìn)行對比分析,從機(jī)理上解釋了不同的計(jì)算方法得到的結(jié)果相差較大的原因,并以蘇里格氣田100口實(shí)例井驗(yàn)證表明通用模型具有較好的普適性。 對攜液模型進(jìn)行參數(shù)敏感性分析,并利用之前提出的井下節(jié)流氣井壓力場、溫度場數(shù)學(xué)模型,結(jié)合氣井生產(chǎn)數(shù)據(jù),模擬井下節(jié)流氣井溫度壓力場分布,并綜合分析了帶井下節(jié)流器的低滲氣井?dāng)y液能力。通過對蘇里格氣田實(shí)測井實(shí)例分析,通用模型能夠準(zhǔn)確預(yù)測氣井積液,為后續(xù)的排水采氣措施實(shí)施提供了依據(jù)。
[Abstract]:In recent years, the downhole throttling technology of gas wells has been popularized and applied in the development of low permeability gas fields. With the continuous development of the gas fields, the proportion of water-producing gas wells increases year by year, and the liquid carrying capacity of gas wells is forecasted in advance. It is of great significance for gas well production to be able to judge bottom hole fluid accumulation. In this paper, the low production gas well with downhole throttle is considered in the production process of gas well. The average parameter method and Cullender-Smith method are used to calculate the bottom hole pressure of the well. Hagedorn-Brown vertical tube pressure calculation method for gas-water two-phase flow is used to calculate the pressure profile in the tubing and the temperature profile in the tubing is calculated considering the radial heat transfer in the well bore. The pressure drop through the throttle nozzle is calculated by using Perkins model, and the calculation model of throttling temperature drop is established according to the characteristics of equal enthalpy before and after throttling and based on the theory of phase equilibrium. In this paper, the vertical gas well is taken as the research object. According to the theory of droplet particle force balance, it is considered that the droplet will deform in the wellbore, and the maximum size of the droplet breakage is considered. On the basis of comprehensive comparison of drag coefficient and calculation of droplet deformation parameters, A general model for the critical condition of continuous liquid carrying in gas wells is established. By comparing and analyzing the existing calculation method of critical flow rate of liquid carrying and the general model, the reason why the results obtained by different calculation methods differ greatly is explained from the mechanism. The results of 100 wells in Sulige gas field show that the universal model has good universality. The parameter sensitivity analysis of liquid carrying model is carried out, and the distribution of temperature and pressure field in downhole throttling gas well is simulated by using the mathematical model of pressure field and temperature field of downhole throttling gas well, and combining with the production data of gas well. The liquid carrying capacity of low permeability gas well with downhole throttle is analyzed synthetically. Through the analysis of the actual well in Sulige gas field, the general model can accurately predict the gas well fluid accumulation, which provides the basis for the subsequent implementation of the drainage and gas recovery measures.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE37

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