本文選題：軸向復合剛度 + 高溫高壓　； 參考：《西南石油大學》2017年碩士論文

【摘要】：高溫高壓氣井大都具有埋藏深、產(chǎn)量高、含酸性氣體、地質(zhì)條件復雜的特點。隨著高溫高壓氣井的逐漸投產(chǎn),這部分氣井由于自由套管所引起的井口抬升、井口管線損壞、完井管柱安全問題逐漸突顯,已經(jīng)成為影響此類氣井安全生產(chǎn)的重要問題之一。為準確預測高溫高壓氣井井口裝置抬升高度并評估其安全性,指導氣井安全生產(chǎn),迫切需要開展自由套管力學特性的研究。提出了水泥環(huán)套管膠結(jié)面機械咬合強度、膠結(jié)強度的測試方法,開展了具有不同膠結(jié)面積的水泥環(huán)套管剪切實驗,得到了軸向載荷與水泥環(huán)套管軸向變形之間的關(guān)系,計算了水泥環(huán)套管膠結(jié)面機械咬合強度、膠結(jié)強度及其占比,弄清了完井后自由套管的形成機理�；谀芰渴睾恪恿渴睾愣�,建立了高溫高壓高產(chǎn)氣井井筒溫度場、壓力場計算模型,提出了一種溫壓耦合求解方法;并以溫度場、壓力場計算模型為基礎(chǔ),建立了油套管柱軸向復合剛度系統(tǒng)軸向應力的計算模型,該模型考慮了環(huán)空流體膨脹、套管熱效應、管柱屈曲、井眼軌跡以及封隔器對軸向應力的影響,結(jié)合井口裝置抬升機理,形成了預測高溫高壓高產(chǎn)氣井井口裝置抬升高度的方法�；谳S向復合剛度力學模型和井筒溫壓場計算模型,引入粒子群多目標優(yōu)化算法,建立了以井口抬升測量信息為基礎(chǔ)反演高溫高壓高產(chǎn)氣井各層自由套管長度的理論模型,結(jié)合井口裝置抬升機理,形成了計算各層自由套管長度的新方法,并利用四川盆地Y氣井井口裝置抬升高度的計算實例驗證了該新方法的準確性及可靠性�；谳S向復合剛度力學模型和井筒溫壓場計算模型編制了氣井自由套管力學行為與井口抬升相關(guān)性計算程序,模擬計算了四川盆地X氣井的溫度場、壓力場,與X氣井井口溫度及環(huán)空壓力實測數(shù)據(jù)吻合,并分析了產(chǎn)量、環(huán)空保護液返深、環(huán)空流體及水泥環(huán)物性參數(shù)對環(huán)空壓力的影響規(guī)律;模擬計算了 X氣井壽命周期內(nèi)各產(chǎn)量條件下的井口裝置抬升高度,分析了產(chǎn)量及各層自由套管長度對井口抬升高度的影響規(guī)律;模擬計算了不同自由套管長度組合的套管柱軸向應力,分析了自由套管組合與軸向應力、安全系數(shù)之間的相關(guān)性:模擬計算了不同產(chǎn)量下的套管柱軸向應力,分析了產(chǎn)量與軸向應力、安全系數(shù)之間的相關(guān)性。計算結(jié)果表明:井口抬升高度隨著產(chǎn)量和自由套管長度增加而增加,X氣井井口抬升高度對生產(chǎn)自由套管長度的變化最敏感,技術(shù)套管次之,表層套管最小;套管軸向應力與自由套管長度和產(chǎn)量密切相關(guān),即某一層自由套管長度相對過長或相對過短都會顯著降低套管的安全性,產(chǎn)量的增加也會明顯降低套管的安全性。
[Abstract]:High temperature and high pressure gas wells are characterized by deep burial, high production, acid gas and complicated geological conditions. With the gradual production of high temperature and high pressure gas wells, the wellhead uplift caused by free casing in this part of gas wells, the damage of wellhead pipelines and the safety problems of completion string have become one of the important problems affecting the safe production of this kind of gas wells. In order to accurately predict the lift height of high temperature and high pressure gas wells, evaluate its safety and guide the safe production of gas wells, it is urgent to study the mechanical properties of free casing. This paper puts forward the testing method of mechanical bite strength and cementing strength of cement annular casing surface. The shear experiments of cement sheath casing with different cementing area are carried out, and the relationship between axial load and axial deformation of cement sheath casing is obtained. The mechanical bite strength, cementing strength and ratio of cement casing cementing surface are calculated, and the formation mechanism of free casing after completion is clarified. Based on the conservation of energy and momentum, the calculation model of temperature field and pressure field in high temperature and high pressure gas well is established, and a method for solving the coupling of temperature and pressure is put forward, which is based on the calculation model of temperature field and pressure field. The axial stress calculation model of the axial composite stiffness system of oil casing string is established. The model takes into account the influence of annular fluid expansion, casing heat effect, string buckling, wellbore trajectory and Packer on axial stress. Based on the lifting mechanism of the wellhead device, a method for predicting the height of the wellhead device in high temperature and high pressure gas wells is developed. Based on axial composite stiffness mechanics model and wellbore temperature and pressure field calculation model, a theoretical model for inversion of free casing length in high temperature and high pressure gas wells based on wellhead lift measurement information is established by introducing particle swarm multi-objective optimization algorithm. A new method for calculating the length of free casing in each layer is formed based on the uplift mechanism of wellhead device. The accuracy and reliability of the new method are verified by an example of calculating the uplift height of wellhead installation in Y gas well in Sichuan Basin. Based on axial composite stiffness mechanics model and wellbore temperature and pressure field calculation model, a program for calculating the correlation between the mechanical behavior of free casing and wellhead uplift in gas wells is developed, and the temperature and pressure fields of X gas wells in Sichuan Basin are simulated and calculated. It agrees with the measured data of wellhead temperature and annular pressure in X gas well, and analyzes the effect of production rate, circumferential protection fluid depth, annular fluid and physical parameters of cement ring on annular pressure. The uplift height of the wellhead device under various production conditions during the life cycle of X gas well is simulated and the influence of production rate and free casing length on the wellhead uplift height is analyzed. The axial stress of casing string with different free casing length combinations is simulated and calculated, and the correlation between free casing combination and axial stress and safety factor is analyzed. The axial stress of casing string under different production rate is simulated and calculated. The correlation between yield, axial stress and safety factor is analyzed. The results show that the increase of wellhead lift height with the increase of production rate and free casing length is the most sensitive to the change of production free casing length, followed by technical casing, and the lowest is surface casing. The axial stress of casing is closely related to the length and output of free casing. That is to say, the safety of casing will be significantly reduced if the length of a certain layer of free casing is relatively long or too short, and the safety of casing will be obviously reduced with the increase of output.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TE931.2

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