本文選題：空氣鉆井 + 鉆進過程　； 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：空氣鉆井過程中,井下溫度分布是影響井下壓力平衡及控制、鉆井液的流變性能、摩阻壓力、井壁穩(wěn)定等方面的重要因素,掌握其分布規(guī)律對鉆井作業(yè)安全、快速地進行具有極其重要的意義。但是,目前關(guān)于空氣鉆井溫度場分布的計算模型還存在以下問題：未考慮鉆頭破巖產(chǎn)熱、流體流動摩擦產(chǎn)熱及鉆柱與井壁摩擦產(chǎn)熱等主要熱源項對井筒溫度的影響；用整體對流換熱系數(shù)代替局部對流換熱系數(shù),導(dǎo)致計算結(jié)果與實際工況差別較大。為了得到更為準(zhǔn)確的空氣鉆井隨鉆井筒溫度分布計算模型,本文做了以下研究： 1.根據(jù)傳熱學(xué)相關(guān)理論,基于能量守恒定律,建立了空氣鉆進過程中地層-環(huán)空-鉆柱內(nèi)的綜合傳熱模型。 2.通過分析空氣鉆進過程中鉆頭破巖產(chǎn)熱、鉆柱與井壁摩擦產(chǎn)熱及流體流動摩擦產(chǎn)熱等主要熱源項,得到了鉆頭破巖過程中的熱量分配比、鉆柱與井壁摩擦過程中環(huán)空氣固兩相流的攜熱量及井筒內(nèi)流體流動摩擦產(chǎn)熱量。 3.以純空氣通過環(huán)空時的對流換熱系數(shù)為標(biāo)準(zhǔn),將氣固兩相流中的三種具有代表性的模型與空氣鉆井實際工況對比分析,考慮了鉆柱旋轉(zhuǎn)對于對流換熱系數(shù)的影響,優(yōu)選出了適合空氣鉆進過程中環(huán)空氣固兩相流對流換熱系數(shù)的計算模型。 4.在本文所分析的井筒熱源項及對流換熱系數(shù)基礎(chǔ)上,編制了計算軟件,得到了不考慮熱源項、考慮單因素?zé)嵩错椉岸嘁蛩責(zé)嵩错棔r的井筒溫度分布曲線,結(jié)合曲線中的各個關(guān)鍵點,對熱源項對于井筒溫度分布的影響進行了分析。 本文對空氣鉆進過程中的熱源項進行了系統(tǒng)分析,并對井筒溫度計算模型中的各個參數(shù)進行了優(yōu)化,得到了考慮了多個熱源項的影響的井筒溫度分布曲線,從而使本文的研究結(jié)果更符合空氣鉆進過程的實際工況。
[Abstract]:In the process of air drilling, the downhole temperature distribution is an important factor affecting the downhole pressure balance and control, the rheological performance of drilling fluid, friction pressure and wellbore stability, etc.It is of great significance to proceed quickly.However, there are still some problems in the calculation model of air drilling temperature field at present: the influence of the main heat source items, such as bit breaking heat production, fluid flow friction heat generation and drillstring and wellbore friction heat generation, on wellbore temperature is not considered;The local convection heat transfer coefficient is replaced by the global convection heat transfer coefficient, which leads to the difference between the calculated results and the actual working conditions.In order to obtain a more accurate model of air drilling temperature distribution with the bore, this paper has done the following research:1.Based on the theory of heat transfer and the law of conservation of energy, the comprehensive heat transfer model of formation, annulus and drill string during air drilling is established.2.Based on the analysis of the main heat sources during air drilling, such as the heat generation of drill bit breaking, the heat of friction between drill string and shaft wall and the friction heat of fluid flow, the heat distribution ratio in the process of bit breaking is obtained.The heat carrying capacity of the annular air-solid two-phase flow and the friction heat production of the fluid flow in the wellbore during the friction between the drill string and the borehole wall.3.Based on the convection heat transfer coefficient of pure air passing through annulus, three representative models of gas-solid two-phase flow are compared with the actual conditions of air drilling, and the effect of drill string rotation on convection heat transfer coefficient is considered.A model for calculating convection heat transfer coefficient of annular air-solid two-phase flow during air drilling is selected.4.On the basis of the wellbore heat source term and convection heat transfer coefficient analyzed in this paper, a calculation software is developed, and the wellbore temperature distribution curve is obtained when the heat source term is not considered, the single factor heat source term and the multi-factor heat source term are considered.Combined with the key points in the curve, the influence of heat source term on wellbore temperature distribution is analyzed.In this paper, the heat source term in air drilling process is systematically analyzed, and the parameters in the wellbore temperature calculation model are optimized, and the wellbore temperature distribution curve considering the influence of multiple heat source terms is obtained.Thus, the research results of this paper are more in line with the actual conditions of air drilling process.
【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】：TE24

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