水平井井筒溫度場數值模擬方法及影響因素研究
發(fā)布時間：2018-07-27 12:38
【摘要】：隨著井下監(jiān)測技術的發(fā)展,利用井下實時監(jiān)測的壓力、溫度數據分析油藏參數和生產參數的變化已正成為智能油田建設的一個重要部分。傳統(tǒng)的井下數據解釋都是以壓力數據為主,溫度數據由于變化幅度小、測量精度要求高而未得到廣泛的實際應用。近年來,隨著光纖溫度傳感技術的應用,大幅度提高了溫度監(jiān)測的精度,使得井下溫度數據的解釋與應用得到廣泛關注。文中考慮流體在油藏和井筒中流動時的熱對流、熱傳導、熱膨脹以及粘滯擴散等熱效應,將油藏和井筒流動分別看作瞬態(tài)和穩(wěn)態(tài)過程,結合動量守恒方程和質量守恒方程,建立了油藏和井筒的水動力學流動模型和溫度模型,研究了油藏——井筒的壓力/溫度場耦合方法,利用有限差分法和Peaceman近似法進行求解。以矩形油藏中心一口水平井為例,研究了不同儲層參數和不同工作參數對井下溫度響應。研究結果表明:流體熱膨脹系數越小,巖石熱傳導率越小,井筒溫度越高。單相流動情況下,均質油藏定壓生產時,儲層滲透率越大,從水平井趾端到跟端,入流溫度與井筒溫度的差值越大;定液量生產時,儲層滲透率越大,入流溫度越小。單相流動情況下,非均質油藏定壓或定液量生產時,入流溫度曲線在低滲段呈現下凹變化趨勢,在高滲段呈現上凸變化趨勢。當油藏發(fā)生氣侵或水侵時,在氣、水侵入處,氣侵表現為該段入流溫度低于其他生產段,而水侵表現為該段入流溫度高于其他生產段,在井筒溫度曲線上出現明顯拐點。研究結果為利用井下溫度數據診斷井下工況、劈分生產層段流量以及判斷儲層參數變化提供了一種技術手段。
[Abstract]:With the development of downhole monitoring technology, the analysis of reservoir parameters and production parameters by using downhole real-time monitoring pressure and temperature data has become an important part of intelligent oilfield construction. The traditional underground data interpretation is mainly based on the pressure data, and the temperature data is not widely used because of its small range of variation and high precision. In recent years, with the application of optical fiber temperature sensing technology, the precision of temperature monitoring has been greatly improved, and the interpretation and application of underground temperature data have been paid more and more attention. In this paper, the thermal convection, heat conduction, thermal expansion and viscous diffusion of fluid flow in reservoir and wellbore are considered. The flow of reservoir and wellbore is regarded as transient and steady state process respectively, combined with momentum conservation equation and mass conservation equation. The hydrodynamic flow model and temperature model of reservoir and wellbore are established. The coupling method of pressure-temperature field between reservoir and wellbore is studied. The finite difference method and Peaceman approximation method are used to solve the problem. Taking a horizontal well in the center of rectangular reservoir as an example, the response of different reservoir parameters and working parameters to downhole temperature is studied. The results show that the smaller the coefficient of thermal expansion, the smaller the thermal conductivity of rock and the higher the wellbore temperature. In the case of single phase flow, the greater the reservoir permeability is, the greater the difference between inflow temperature and wellbore temperature is from the toe end of horizontal well to the heel end, and the larger the reservoir permeability is, the smaller the inflow temperature is when the constant flow rate is produced. In the case of single phase flow, the inlet temperature curve shows a concave trend in the low permeability section and a convex trend in the high permeability section during the production of constant pressure or constant liquid quantity in the heterogeneous reservoir. When the gas or water invasion occurs in the reservoir, where the gas and water invade, the gas invasion shows that the inlet temperature of the section is lower than that of the other production section, while the water invasion shows that the inflow temperature of the section is higher than that of the other production section, and the obvious inflection point appears on the wellbore temperature curve. The research results provide a technical means for diagnosing downhole working conditions splitting the flow rate of production section and judging the variation of reservoir parameters by using downhole temperature data.
【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】：TE358
本文編號：2147856
[Abstract]:With the development of downhole monitoring technology, the analysis of reservoir parameters and production parameters by using downhole real-time monitoring pressure and temperature data has become an important part of intelligent oilfield construction. The traditional underground data interpretation is mainly based on the pressure data, and the temperature data is not widely used because of its small range of variation and high precision. In recent years, with the application of optical fiber temperature sensing technology, the precision of temperature monitoring has been greatly improved, and the interpretation and application of underground temperature data have been paid more and more attention. In this paper, the thermal convection, heat conduction, thermal expansion and viscous diffusion of fluid flow in reservoir and wellbore are considered. The flow of reservoir and wellbore is regarded as transient and steady state process respectively, combined with momentum conservation equation and mass conservation equation. The hydrodynamic flow model and temperature model of reservoir and wellbore are established. The coupling method of pressure-temperature field between reservoir and wellbore is studied. The finite difference method and Peaceman approximation method are used to solve the problem. Taking a horizontal well in the center of rectangular reservoir as an example, the response of different reservoir parameters and working parameters to downhole temperature is studied. The results show that the smaller the coefficient of thermal expansion, the smaller the thermal conductivity of rock and the higher the wellbore temperature. In the case of single phase flow, the greater the reservoir permeability is, the greater the difference between inflow temperature and wellbore temperature is from the toe end of horizontal well to the heel end, and the larger the reservoir permeability is, the smaller the inflow temperature is when the constant flow rate is produced. In the case of single phase flow, the inlet temperature curve shows a concave trend in the low permeability section and a convex trend in the high permeability section during the production of constant pressure or constant liquid quantity in the heterogeneous reservoir. When the gas or water invasion occurs in the reservoir, where the gas and water invade, the gas invasion shows that the inlet temperature of the section is lower than that of the other production section, while the water invasion shows that the inflow temperature of the section is higher than that of the other production section, and the obvious inflection point appears on the wellbore temperature curve. The research results provide a technical means for diagnosing downhole working conditions splitting the flow rate of production section and judging the variation of reservoir parameters by using downhole temperature data.
【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】：TE358
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