大庆油田稠油油藏井筒内温度分布情况及影响因素研究

发布时间：2018-04-01 02:12

  本文选题：井筒温度　切入点：稠油油藏　出处：《东北石油大学》2017年硕士论文

【摘要】：随着常规油藏储量的日益枯竭,非常规油藏的高效开采已迫在眉睫,而在我国已开采的各油气田中,还有储量巨大的稠油未被有效的开采,累加起来有近二十亿吨。这类油藏由于高含蜡、高熔点,导致其不易于流动,大大制约了产出效率和产量,因此如何提高稠油的流动性将是高效开采这类油藏的主要因素。深入分析稠油的物理特性,稠油的高熔点是引起稠油不易流动的主要原因,如果对稠油进行加温,使其呈现出高液的状态,可以大大提高其流动性。所以,弄清楚稠油油藏井筒内温度的分布规律,在此规律上使用升温措施提高稠油的温度,进而使稠油更易于流动,这对高效开采稠油有着很重大的意义。本论文将对比介绍目前油田生产中常用的油气举升工艺,对比其优缺点、适用性和目前油田生产中的使用情况,着重探讨稠油油藏的各类举升工艺的原理、所出现的问题和在油田中的使用条件。分析稠油油藏的特点,深入研究油井和地层中的温度存在状态,由热量传导的相关知识,研究稠油油井中的热存在状态,综合考虑井筒里和地层中的热量状态,使用多种方程相结合的方式构建电加热井、无辅助工艺井、掺稀井(包括油管掺稀与套管掺稀)和电潜泵井井里温度存在情况的数学模型,对每个模型进行求解。在构建的模型的基础上,结合大庆油田生产现场的实测数据,制作了了井筒里温度存在情况的曲线,同时开展了实例运算,求解出的井口温度和生产井口测量的温度平均相对误差在8%以内。随后,讨论了影响机采井井里温度存在情况的多种因素,研究结果显示,当井内含水相对多的时候,井筒里的温度慢慢上升;就电加热井而言,加热位置和井口之间,加热位置离井口越远,井筒里的温度随之下降,当增大加热功率时,井筒里的温度上升。就掺稀井而言,掺稀位置处温度改变较为剧烈,当增大掺稀量、增加掺稀位置距井口的距离,掺稀位置到井口的温度会越高。
[Abstract]:With the increasing depletion of reserves in conventional reservoirs, the efficient production of unconventional reservoirs is imminent, and in the various oil and gas fields that have been exploited in China, there are still huge reserves of heavy oil that have not been effectively exploited. This kind of reservoir is difficult to flow because of its high wax content and high melting point, which greatly restricts the production efficiency and output. Therefore, how to improve the fluidity of heavy oil will be the main factor for high efficiency exploitation of this kind of reservoir. After analyzing the physical characteristics of heavy oil, the high melting point of heavy oil is the main reason for the difficult flow of heavy oil. If the heavy oil is heated, It can greatly improve the fluidity of heavy oil reservoir by making it appear high liquid state. Therefore, the distribution law of wellbore temperature in heavy oil reservoir is clarified, and the temperature of heavy oil is raised by means of heating measures in this rule, which makes heavy oil flow more easily. This will be of great significance to the efficient production of heavy oil. This paper will compare and introduce the oil and gas lifting technology commonly used in oil field production, compare its advantages and disadvantages, its applicability and the current situation of oil field production. The principle, problems and application conditions of various lifting processes in heavy oil reservoirs are emphatically discussed. The characteristics of heavy oil reservoirs are analyzed, and the existing state of temperature in oil wells and formations is deeply studied, and the relevant knowledge of heat conduction is studied. The heat existing state in heavy oil well is studied. Considering the heat state in wellbore and formation, electric heating well is constructed by combining many kinds of equations, and there is no auxiliary technology well. The mathematical models of the temperature in well with dilute (including tubing and casing) and electric submersible pump are solved. On the basis of the established model, combined with the measured data of Daqing oil field, The curves of the existence of wellbore temperature are made, and an example operation is carried out. The average relative error between the calculated wellhead temperature and the measured temperature of production wellhead is less than 8%. This paper discusses several factors that influence the existence of temperature in mechanically produced wells. The results show that when the water in the well is relatively high, the temperature in the wellbore rises slowly and, in the case of electric heating wells, the heating position is between the heating position and the wellhead. The farther away the heating position is from the wellhead, the lower the wellbore temperature will be. When the heating power is increased, the temperature in the wellbore will rise. Increasing the distance from the dilute position to the wellhead, the temperature from the dilute position to the wellhead will be higher.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE345
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本文编号：1693501