【摘要】：注蒸汽開采稠油時通過井筒將蒸汽注入油層,在此過程中蒸汽通過同心油套環(huán)空與地層之間發(fā)生熱量交換。但由于鉆井過程井眼軌跡并非直線,而是螺旋線形,導(dǎo)致井筒油套環(huán)空出現(xiàn)偏心,而偏心環(huán)空中的換熱特性研究還不充分,且目前還沒有成熟的計算方法,因此準(zhǔn)確計算偏心環(huán)空換熱過程至關(guān)重要。本文以薄壁不銹鋼環(huán)形套管為研究對象,以水為介質(zhì),針對三種不同管徑比(3.06、2.25、1.875)、三種不同偏心度(0.2、0.5、0.8)及不同雷諾數(shù),在內(nèi)管恒定入口溫度及流量,環(huán)空恒定入口溫度,外管外壁面與空氣自然對流的條件下對豎直偏心環(huán)空通道內(nèi)的流動與換熱特性進(jìn)行實驗,并對環(huán)空通道內(nèi)換熱特性的影響因素進(jìn)行分析,得到環(huán)空通道內(nèi)單相強迫對流換熱的實驗關(guān)聯(lián)式。同時通過數(shù)值模擬與實驗結(jié)果相對比,得到了以下結(jié)論:偏心度對換熱的影響在不同管徑比下呈現(xiàn)出不同的規(guī)律。在管徑比為3.06時,偏心度的增大總是強化換熱。在管徑比為1.875時,偏心度對換熱的影響隨著雷諾數(shù)的不同分為兩個區(qū)域:當(dāng)Re2000時,偏心度的增大會削弱環(huán)空通道中的對流傳熱,當(dāng)Re2000時,呈現(xiàn)出相反的規(guī)律,即偏心度的增大會強化環(huán)空通道的對流換熱。管徑比的增大會強化環(huán)空通道的換熱。但管徑比對環(huán)空通道換熱特性的影響受到偏心度及雷諾數(shù)的共同影響。隨著偏心度的減小,管徑比的增大對換熱的強化作用在減弱,隨著雷諾數(shù)增大,管徑比的增大對環(huán)空通道內(nèi)換熱的強化作用增強。
[Abstract]:Steam is injected into the reservoir through wellbore when heavy oil is produced by steam injection, in which heat exchange occurs between steam and formation through concentric oil sleeve annulus. However, due to the fact that the wellbore trajectory is not a straight line, but a spiral, resulting in eccentricity in the annulus of the wellbore oil sleeve, the research on the heat transfer characteristics in the eccentric annulus is not sufficient, and there is no mature calculation method at present. Therefore, it is very important to calculate the heat transfer process of eccentric annulus accurately. In this paper, thin-wall stainless steel annular casing is taken as the research object, and water is used as the medium for three different pipe diameter ratios (3.06, 2.25, 1.875), three different eccentricity (0.2, 0.5, 0.8) and different Reynolds numbers. The flow and heat transfer characteristics in a vertical eccentric annular channel are tested under the conditions of constant inlet temperature and flow rate in the inner tube, constant inlet temperature in the annulus, and natural convection between the outer wall of the outer tube and the air. The influencing factors of heat transfer characteristics in annular channel are analyzed, and the experimental correlation of single-phase forced convective heat transfer in annular channel is obtained. At the same time, by comparing the numerical simulation with the experimental results, the following conclusions are obtained: the effect of eccentricity on heat transfer shows different laws under different pipe diameter ratios. When the ratio of pipe to diameter is 3.06, the increase of eccentricity is always enhanced heat transfer. When the ratio of pipe to diameter is 1.875, the effect of eccentricity on heat transfer is divided into two regions with the difference of Reynolds number: when Re2000, the increase of eccentricity weakens the convective heat transfer in annular channel, and when Re2000, it shows the opposite law. That is, the increase of eccentricity will enhance the convective heat transfer of annular channel. The increase of pipe diameter ratio will enhance the heat transfer of annular channel. However, the influence of pipe diameter ratio on the heat transfer characteristics of annular channel is affected by eccentricity and Reynolds number. With the decrease of eccentricity, the enhancement effect of pipe diameter ratio on heat transfer is weakened, and with the increase of Reynolds number, the enhancement effect of pipe diameter ratio on heat transfer in annular channel is enhanced.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE357.44;TK124

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