發(fā)布時間：2018-08-26 08:01

【摘要】：隨著勘探開發(fā)的不斷深入以及復雜油氣層的大量開采,大斜度井的應用范圍越來越廣。大斜度井具有井眼軌跡復雜、井斜角大、裸眼井段長、凈化難度大、套管串下入深度大等特點,給后續(xù)工作帶來諸多挑戰(zhàn)。如果大斜度井下套管產(chǎn)生的波動壓力預測不準確會造成井壁不穩(wěn)定以及井漏等復雜情況和工程事故的發(fā)生,致使固井作業(yè)時的井徑不規(guī)則,從而導致固井質量差,影響后續(xù)的生產(chǎn)及油氣井壽命。因此,對大斜度井下套管瞬態(tài)波動壓力計算分析進行研究具有非常重要的現(xiàn)實意義。本文根據(jù)波的基本性質分析了下套管過程中波動壓力產(chǎn)生的原因以及壓力波在鉆井液中的動態(tài)傳播機理,建立壓力波在鉆井液等可壓縮流體中的傳播速度模型。針對環(huán)空直徑復雜計算的問題,通過對比圓管流動和環(huán)空流動,提出了等效直徑簡化環(huán)空直徑的計算直徑思路,建立了下套管過程中流道的壁面剪切應力計算模型。根據(jù)彈性管-可壓縮流體理論對大斜度井下套管鉆井液的流動狀態(tài)進行分析,建立了大斜度井下套管瞬態(tài)波動壓力二維計算模型,在此基礎上考慮井斜角方位角,建立了大斜度井下套管瞬態(tài)波動壓力三維計算模型,推導出了二維、三維條件下對應的波動壓力連續(xù)性方程和運動方程組,為便于編程,給出對應方程組的麥考馬克數(shù)值解法�；诒疚慕⒌那蠼獯笮倍染绿坠芩矐B(tài)波動壓力計算模型,在VB開發(fā)環(huán)境下編制了一套大斜度井下套管波動壓力計算軟件,運用軟件對實例開發(fā)井波動壓力進行預測計算,通過軟件計算結果分析影響大斜度井下套管波動壓力的各種因素及其對波動壓力影響作用的規(guī)律,為大斜度井套管安全下入奠定了理論基礎。
[Abstract]:With the deepening of exploration and development and the development of complex oil and gas reservoirs, the application of large deviated wells is becoming more and more extensive. Due to its complex well trajectory, large angle, long open hole section, great difficulty in purification and large depth of casing string, it brings many challenges to the follow-up work. If the prediction of fluctuating pressure produced by high slope downhole casing is not accurate, it will lead to the instability of wellbore, the occurrence of complex conditions such as well leakage and engineering accidents, and the irregularity of well diameter in cementing operation, which will lead to poor cementing quality. Affects subsequent production and life of oil and gas wells. Therefore, it is of great practical significance to study the calculation and analysis of transient fluctuation pressure of downhole casing with large slope. In this paper, according to the basic properties of the wave, the causes of wave pressure and the dynamic propagation mechanism of pressure wave in drilling fluid are analyzed, and the velocity model of pressure wave propagation in compressible fluid such as drilling fluid is established. In view of the complicated calculation of annular diameter, by comparing the annular flow and annular flow, the paper puts forward the idea of equivalent diameter to simplify the calculation of annular diameter, and establishes the wall shear stress calculation model of the runner in the process of casing. Based on the theory of elastic tube-compressible fluid, the flow state of downhole casing drilling fluid with high inclination is analyzed, and a two-dimensional calculation model of transient fluctuating pressure of downhole casing with large inclination is established, on which the azimuth angle of well inclination angle is considered. A three-dimensional calculation model for transient wave pressure of downhole casing with large slope is established, and the corresponding wave pressure continuity equation and motion equations are derived under two-dimensional and three-dimensional conditions. In order to facilitate programming, a McCormack numerical solution to the corresponding equations is given. Based on the model established in this paper for calculating the transient fluctuation pressure of downhole casing with large slope, a set of software for calculating the fluctuating pressure of downhole casing with large slope is developed under the environment of VB. The software is used to predict and calculate the fluctuating pressure of an example development well. Through the analysis of the results of software calculation, various factors affecting the fluctuation pressure of downhole casing with high inclination and the law of its influence on the fluctuating pressure are analyzed, which lays a theoretical foundation for the safe entry of casing in the high slope well.
【學位授予單位】：中國石油大學(華東)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE931.2

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