水平井井筒温度场数值模拟方法及影响因素研究

发布时间：2018-07-27 12:38

【摘要】：随着井下监测技术的发展,利用井下实时监测的压力、温度数据分析油藏参数和生产参数的变化已正成为智能油田建设的一个重要部分。传统的井下数据解释都是以压力数据为主,温度数据由于变化幅度小、测量精度要求高而未得到广泛的实际应用。近年来,随着光纤温度传感技术的应用,大幅度提高了温度监测的精度,使得井下温度数据的解释与应用得到广泛关注。文中考虑流体在油藏和井筒中流动时的热对流、热传导、热膨胀以及粘滞扩散等热效应,将油藏和井筒流动分别看作瞬态和稳态过程,结合动量守恒方程和质量守恒方程,建立了油藏和井筒的水动力学流动模型和温度模型,研究了油藏——井筒的压力/温度场耦合方法,利用有限差分法和Peaceman近似法进行求解。以矩形油藏中心一口水平井为例,研究了不同储层参数和不同工作参数对井下温度响应。研究结果表明:流体热膨胀系数越小,岩石热传导率越小,井筒温度越高。单相流动情况下,均质油藏定压生产时,储层渗透率越大,从水平井趾端到跟端,入流温度与井筒温度的差值越大;定液量生产时,储层渗透率越大,入流温度越小。单相流动情况下,非均质油藏定压或定液量生产时,入流温度曲线在低渗段呈现下凹变化趋势,在高渗段呈现上凸变化趋势。当油藏发生气侵或水侵时,在气、水侵入处,气侵表现为该段入流温度低于其他生产段,而水侵表现为该段入流温度高于其他生产段,在井筒温度曲线上出现明显拐点。研究结果为利用井下温度数据诊断井下工况、劈分生产层段流量以及判断储层参数变化提供了一种技术手段。
[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.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE358

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