萨中油田萨葡油层密井网下合理流压研究

发布时间：2018-01-07 04:23

本文关键词：萨中油田萨葡油层密井网下合理流压研究　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,萨中开发区水驱萨葡油层由基础井网发展到一、二、三次加密调整井网,随着各个区块加密井网的设计部署,层系重组,井网重构,注采井距缩小,开发条件发生重大变化,油田的开发难度越来越大。水驱含水上升率和三次采油效果控制难度加大,传统的合理流压界限确定方法已经不适应目前油田的开发条件。因此,开展不同类型油层、不同井距、不同含水率条件下的水驱合理流压界限研究,确定油井合理流压,是目前油田急需解决的开发难题。本文应用油藏工程方法和数值模拟方法,考虑地层最大供液、泵下入深度、泵效、最大注入压力等因素,确定出萨葡油层密井网条件下流压下限,考虑采油速度确定出流压上限,给出了保持地层压力(原始地层压力、饱和压力、地饱压差-1MPa)、地层压力下降(总注采比0.7、0.8、0.9)6种不同压力水平下,流压随井距和含水变化规律。研究表明,不同井距(106m、125m、150m、175m)、不同含水率阶段的水驱油井合理流压界限确定方法及变化规律。相同流压条件时,注入压力随着含水率的升高而升高,采油速度随着含水率的升高而降低;相同含水率的情况下,注入压力随生产井井底流压的升高而降低,采油速度随生产井井底流压的升高而降低。由保持地层压力的三种情况可以看出,在保持不同的压力水平下,保持地层压力越高,流压的上限越高,流压的下限也越高;地层压力持续下降的三种情况下,总注采比越小,地层亏空越大,流压的上限越低,流压的下限越低。合理流压随含水率增加而增大,随井距增大而减小。相同井距条件下,合理流压随含水率增加而增大,随地层压力的升高而增大。基于确定的流压界限,通过回归分析,建立了考虑井距、含水率的水驱合理流压界限计算模型,并结合现场实际,为下一步流压的调整提供了依据。
[Abstract]:At present, the water drive oil reservoir in Sazhong Development Zone has developed from the basic well pattern to the first, second and third infill adjustment well pattern. With the design and deployment of the infill well pattern in each block, the layer system reorganization, the well pattern reconstruction, the injection-production well spacing is reduced. The development conditions have changed greatly, the development of oil fields is becoming more and more difficult, and the water cut rise rate of water flooding and the control of tertiary oil recovery are becoming more difficult. The traditional method of determining reasonable flow pressure limits is not suitable for the current oilfield development conditions. Therefore, the study on the reasonable flow pressure limits of water drive under different types of oil layers, different well spacing and different water cut is carried out. It is an urgent problem to determine the reasonable flow pressure of oil well. In this paper, the reservoir engineering method and numerical simulation method are used to consider the factors such as the maximum liquid supply, the depth of the pump, the efficiency of the pump, the maximum injection pressure and so on. The lower limit of flow pressure is determined under the condition of dense well pattern in Sapu reservoir, and the upper limit of flow pressure is determined by considering the oil recovery speed, and the maintenance formation pressure (original formation pressure, saturation pressure, ground saturation pressure difference-1MPa) is given. The flow pressure changes with well spacing and water cut at 6 different pressure levels (the total injection-production ratio is 0.7m 0.80.90%). The results show that the flow pressure varies from 106mm to 125m at different intervals. The reasonable flow pressure limit of water flooding wells at different water cut stages is determined and its variation law is determined. Under the same flow pressure conditions, the injection pressure increases with the increase of water cut. The oil recovery rate decreases with the increase of water cut. Under the condition of the same water cut, the injection pressure decreases with the increase of the bottom flow pressure of the production well, and the oil recovery rate decreases with the increase of the bottom flow pressure of the production well, which can be seen from the three conditions of maintaining the formation pressure. Under different pressure levels, the higher the formation pressure, the higher the upper limit of flow pressure and the higher the lower limit of flow pressure. The lower the total injection-production ratio, the greater the formation deficit, the lower the upper limit of flow pressure and the lower the lower limit of flow pressure. The reasonable flow pressure increases with the increase of water content. Under the same well spacing, the reasonable flow pressure increases with the increase of water cut, and increases with the increase of anywhere pressure. Based on the determined boundary of flow pressure, the well spacing is considered by regression analysis. The reasonable flow pressure limit calculation model of water flooding, combined with the field practice, provides the basis for the adjustment of the flow pressure in the next step.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE324

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