【摘要】：隨著井下監(jiān)測(cè)技術(shù)的發(fā)展,利用井下實(shí)時(shí)監(jiān)測(cè)的壓力、溫度數(shù)據(jù)分析油藏參數(shù)和生產(chǎn)參數(shù)的變化已正成為智能油田建設(shè)的一個(gè)重要部分。傳統(tǒng)的井下數(shù)據(jù)解釋都是以壓力數(shù)據(jù)為主,溫度數(shù)據(jù)由于變化幅度小、測(cè)量精度要求高而未得到廣泛的實(shí)際應(yīng)用。近年來(lái),隨著光纖溫度傳感技術(shù)的應(yīng)用,大幅度提高了溫度監(jiān)測(cè)的精度,使得井下溫度數(shù)據(jù)的解釋與應(yīng)用得到廣泛關(guān)注。文中考慮流體在油藏和井筒中流動(dòng)時(shí)的熱對(duì)流、熱傳導(dǎo)、熱膨脹以及粘滯擴(kuò)散等熱效應(yīng),將油藏和井筒流動(dòng)分別看作瞬態(tài)和穩(wěn)態(tài)過(guò)程,結(jié)合動(dòng)量守恒方程和質(zhì)量守恒方程,建立了油藏和井筒的水動(dòng)力學(xué)流動(dòng)模型和溫度模型,研究了油藏——井筒的壓力/溫度場(chǎng)耦合方法,利用有限差分法和Peaceman近似法進(jìn)行求解。以矩形油藏中心一口水平井為例,研究了不同儲(chǔ)層參數(shù)和不同工作參數(shù)對(duì)井下溫度響應(yīng)。研究結(jié)果表明:流體熱膨脹系數(shù)越小,巖石熱傳導(dǎo)率越小,井筒溫度越高。單相流動(dòng)情況下,均質(zhì)油藏定壓生產(chǎn)時(shí),儲(chǔ)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(chǎn)時(shí),儲(chǔ)層滲透率越大,入流溫度越小。單相流動(dòng)情況下,非均質(zhì)油藏定壓或定液量生產(chǎn)時(shí),入流溫度曲線在低滲段呈現(xiàn)下凹變化趨勢(shì),在高滲段呈現(xiàn)上凸變化趨勢(shì)。當(dāng)油藏發(fā)生氣侵或水侵時(shí),在氣、水侵入處,氣侵表現(xiàn)為該段入流溫度低于其他生產(chǎn)段,而水侵表現(xiàn)為該段入流溫度高于其他生產(chǎn)段,在井筒溫度曲線上出現(xiàn)明顯拐點(diǎn)。研究結(jié)果為利用井下溫度數(shù)據(jù)診斷井下工況、劈分生產(chǎn)層段流量以及判斷儲(chǔ)層參數(shù)變化提供了一種技術(shù)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(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TE358

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