吴起油田曾岔地区注水开发方案设计

发布时间：2018-02-01 04:36

本文关键词： 低渗透油藏储层特征注水开发油藏工程开发方案　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：根据对吴起油田曾岔地区长61油藏沉积、构造、储层、及油层分布等特征的综合分析,本区长61油藏油气分布主要受储层沉积特征、岩性及物性等因素控制,属于岩性油藏或岩性-构造复合油气藏。由于研究区储层物性条件较差,构造不发育,长61油藏油水分异不太明显,油水混储,无明显的油水界面,缺乏边、底水。曾岔油田长91亦属于岩性油藏或岩性-构造复合油气藏。从每个层位的生产井产能级别分类可以看出,主要生产层位是长6层。41-248井区长6层的产能比28-46井区长6层的产能高,长9层的产能又较长6层的要高一些。长6采区属于低孔特低渗透油藏,油藏储层岩性致密,孔喉半径小,渗流阻力大,导致油井几乎无自然产能。大多数油井为压裂投产。曾岔油区适合注水开发。结合曾岔油区的油藏地质特征,认为本区应采用注水方式保持地层压力,以期最大限度地提高油田采收率,获取最佳经济效益。通过油藏工程分析,对现有井网进行优化研究,建议注采井网采用450-150m的不规则菱形反九点,局部不好调整为反九点的井组,采用五点法井网进行调整。
[Abstract]:According to the comprehensive analysis of the sedimentary, structural, reservoir and reservoir distribution characteristics of Chang61 reservoir in Zengcha area, Wuqi Oilfield, the oil and gas distribution of Chang61 reservoir in this area is mainly attributed to the sedimentary characteristics of the reservoir. The lithology and physical properties are controlled by lithologic reservoir or lithology-structure compound reservoir. Because of the poor physical condition of reservoir in the study area, the structure is not developed, the oil-water differentiation of Chang 61 reservoir is not obvious, and the oil-water mixed reservoir is not obvious. There is no obvious oil-water interface, lack of edge and bottom water. Chang91 of Zengcha Oilfield also belongs to lithologic reservoir or lithology-structure composite reservoir. The productivity of the main production horizon is 6 layers. 41-248 well area is higher than that of 28-46 well area. The productivity of Chang 9 layer is higher than that of long 6 layer. Chang6 production area belongs to low porosity and low permeability reservoir with tight lithology, small pore throat radius and large percolation resistance. As a result, the oil wells have almost no natural productivity. Most of the wells are produced by fracturing. Zengcha oil area is suitable for water injection development. Combined with the reservoir geological characteristics of Zengcha oil area, it is considered that water injection should be used to maintain formation pressure in this area. In order to maximize oil recovery, obtain the best economic benefits. Through reservoir engineering analysis, the existing well pattern optimization research. It is suggested that the injection and production well pattern should be adjusted with the irregular rhombic inverse nine points of 450-150 m and the well group which is not easy to adjust to the inverse nine points in the local area and the five-point well pattern should be used to adjust the well pattern.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.6

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