本文選題：氣井　切入點(diǎn)：井下節(jié)流　出處：《西南石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：泡沫排水采氣工藝技術(shù)憑借其成本低、工藝簡單、見效快的優(yōu)點(diǎn)成為排水采氣工藝的首選。但由于部分氣田氣井普遍下有節(jié)流嘴,給泡沫排水采氣工藝的實(shí)施帶來了一定程度的局限性。有些節(jié)流氣井采取泡沫排水措施后效果很差甚至無效,泡排劑投入后井筒內(nèi)流動情況已經(jīng)很難以判斷,而且節(jié)流嘴的存在使得井筒中流動規(guī)律更加復(fù)雜,對氣井泡排節(jié)流工藝的實(shí)施造成了很大困難。目前針對氣水兩相節(jié)流壓降的模型研究較多,但是針對泡排節(jié)流壓降的模型非常少,并且現(xiàn)有計(jì)算泡排節(jié)流的模型很多都是在氣水模型上進(jìn)行修正,并沒有考慮泡沫流體自身與氣水節(jié)流不同的性質(zhì)。本文在大量文獻(xiàn)調(diào)研的基礎(chǔ)上,開展了氣水管流、泡排管流、氣水節(jié)流與泡排節(jié)流四類共計(jì)105組實(shí)驗(yàn),觀察井筒內(nèi)流型變化、流態(tài)變化,分析節(jié)流嘴前后壓力、氣體流量、液體流量等測試數(shù)據(jù),并且使用兩種不同濃度的泡排劑進(jìn)行對比實(shí)驗(yàn)。對單個氣泡進(jìn)行受力分析,通過考慮氣泡在井筒中的排列特征建立了一種新的泡沫流體密度計(jì)算模型,通過新的密度模型對泡沫節(jié)流壓降模型進(jìn)行修正,利用實(shí)驗(yàn)對Perkins模型、Ashford模型、Sachdeva模型和泡沫節(jié)流修正模型進(jìn)行了評價,選取適合的泡沫流體井筒壓力溫度分布模型,建立泡排節(jié)流井筒壓力溫度場耦合模型并且針對現(xiàn)場數(shù)據(jù)進(jìn)行計(jì)算驗(yàn)證,編制了針對現(xiàn)場的井下泡排節(jié)流理論計(jì)算典型圖版。
[Abstract]:Foam drainage gas recovery technology has become the first choice of drainage gas production technology because of its advantages of low cost, simple process and fast efficiency. However, because of the common throttling nozzle in some gas wells in gas fields, It has brought some limitations to the implementation of foam drainage and gas recovery technology. Some gas wells with gas throttling have poor or even ineffective effect after adopting foam drainage measures, and it is difficult to judge the flow situation in the wellbore after the foam draining agent is put in. Moreover, the existence of throttle makes the flow law in wellbore more complicated, which makes it very difficult to implement the throttling process of bubble discharge in gas well. At present, there are many researches on the model of gas-water two-phase throttling pressure drop. However, there are very few models for the pressure drop of bubble row throttling, and many of the existing models for calculating bubble row throttling are modified on the air-water model. On the basis of a great deal of literature investigation, 105 groups of experiments were carried out in this paper, including air pipe flow, bubble discharge pipe flow, gas water throttling and bubble discharge throttling, to observe the change of flow pattern in wellbore. The pressure, gas flow rate and liquid flow rate before and after throttling nozzle are analyzed, and two different concentrations of bubble discharge agent are used to carry out comparative experiments. A new foam fluid density calculation model is established by considering the arrangement characteristics of bubbles in the wellbore, and the foam throttling pressure drop model is modified by a new density model. The Perkins model, the Ashford model, the Sachdeva model and the modified foam throttling model are evaluated by experiments. The suitable wellbore pressure and temperature distribution model of foam fluid is selected. The coupling model of pressure and temperature field of bubble row throttling well bore is established and the field data is calculated and verified. A typical chart of theoretical calculation for downhole bubble row throttling is developed.
【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】：2017
【分類號】：TE377

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