双水平井SAGD超稠油生产优化研究

发布时间：2018-04-22 02:03

  本文选题：SAGD + 超稠油　； 参考：《西南石油大学》2017年硕士论文

【摘要】：随着石油资源需求量的不断攀升和常规油气资源量的减少,超稠油的开发利用越来越受到人们的重视。蒸汽辅助重力驱油(SAGD)作为开发超稠油的前沿技术,由于其具有较高的采收率,所以SAGD在稠油开采中应用越来越广泛,研究适用于稠油油藏特别是超稠油油藏的开采的重力泄油技术具有十分重要的意义。本文从理论研究和数值模拟两个方面进行蒸汽辅助重力泄油技术的研究。随着SAGD技术的不断发展,对SAGD产量预测的模型提出了更高的要求。本文对SAGD产量预测模型的研究现状进行了调研,首先对现有的产量预测模型进行了分析和改进,并在现有模型的基础上建立了新的曲面产量预测模型。①Butler产量模型,应用Butler模型计算了蒸汽腔垂向阶段和侧向扩展阶段的产量,并对Butler模型进行修正,绘制了产量曲线。②曲面模型,在线性模型的基础上,考虑蒸汽腔的实际形状为不规则的曲面。推导出了蒸汽腔侧向扩展阶段的产量,并分析渗透率和孔隙度和油藏厚度对产量的影响,推导出了蒸汽腔界面交界处长度的计算方法,绘制不同阶段的产量曲线。利用数值模拟软件CMG建立双水平井SAGD油藏数值模型,分析蒸汽腔不同阶段的扩展,得到数值模拟产量预测结果,通过模拟分析油藏厚度、油藏孔隙度、油藏渗透率和隔夹层不同地质参数对SAGD的影响,油藏厚度越大,孔隙度越高,油藏渗透率越大,SAGD产量效果越好,小规模的隔夹层对SAGD的影响较小;优化注入蒸汽干度、注入蒸汽速度、注入蒸汽温度以及采注比生产参数,优化得到最佳注入蒸汽干度为0.8,最佳注入蒸汽速度控制在150m~3/d至200m~3/d之间,最佳采注比为1.3,蒸汽温度相对于蒸汽干度等影响效果较小,温度控制在240℃以上。
[Abstract]:With the increasing demand for oil resources and the decrease of conventional oil and gas resources, people pay more and more attention to the development and utilization of super heavy oil. Steam assisted gravity drive (sagd) is a frontier technology in the development of super heavy oil. Because of its high recovery efficiency, SAGD is more and more widely used in heavy oil recovery. It is of great significance to study the gravity oil releasing technology which is suitable for heavy oil reservoir, especially for super heavy oil reservoir. In this paper, steam assisted gravity oil discharge technology is studied from two aspects: theoretical research and numerical simulation. With the development of SAGD technology, higher requirements are put forward for the model of SAGD production prediction. In this paper, the research status of SAGD yield forecasting model is investigated. Firstly, the existing production forecasting model is analyzed and improved, and a new curved surface yield prediction model. The Butler model is used to calculate the output of the vertical stage and the lateral expansion stage of the steam cavity. The Butler model is modified and the yield curve and surface model is drawn. On the basis of the linear model, the output curve and surface model are drawn. Consider that the actual shape of the steam chamber is an irregular surface. This paper deduces the output in the stage of lateral expansion of steam cavity, analyzes the influence of permeability, porosity and reservoir thickness on the output, deduces the calculation method of the length of the interface of steam cavity, and draws the output curve of different stages. The numerical model of double horizontal well SAGD reservoir is established by using the numerical simulation software CMG. The expansion of steam cavity in different stages is analyzed, and the predicted result of numerical simulation production is obtained. The reservoir thickness and reservoir porosity are simulated and analyzed. The larger the reservoir thickness, the higher the porosity, the greater the reservoir permeability, the better the effect of SAGD production, the smaller the intercalation, the less the effect on SAGD, and the better the steam dryness. The optimum steam dry degree is 0.8 and the best steam injection velocity is controlled between 150m~3/d and 200m~3/d by optimizing the steam injection speed, the injection steam temperature and the production-injection ratio production parameters. The optimum injection ratio is 1.3, the effect of steam temperature relative to steam dryness is small, and the temperature is controlled above 240 鈩，

本文编号：1785094