广利莱36低渗透油藏剩余油分布及调整方案

发布时间：2018-03-06 01:19

本文选题：广利油田　切入点：油层综合治理　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：莱36低渗透油层位于广利油田中部,含油层位沙四段,油藏埋深2500-2730m[1],含油面积4.0km2,现井网采收率41.8%。广利油田位于东营凹陷中央隆起带东端,是一个受五条三级大断层控制的整状构造油藏。低渗透油层地面状况复杂,被金湖银河、物流园、湿地等规划区包围。目前,广利油田油层面临的难题是:采出程度不高,采油速度较低,注水井注水压力高,生产井产能不足。这些难题严重影响了油田的高效开发。本文从广利油田油层油藏地质特征、渗流特征以及实际开发动态特征入手,运用油藏地质、油藏工程的方法与原理深入分析了影响注水开发效果的原因,论证了开发层系、井网、井距适应性,提出影响广利油田油层油藏注水开发效果的关键因素,建议从低渗透油藏渗流特征和油层砂体的分布特征入手,以建立储层有效连通、完善注采对应关系为目的,适当缩小注采井距,从而实现扩大流动区域,提高水驱控制程度的效果[2]。在以上研究的基础上,通过对广利油田油层剩余油分布进行预测分析,目前油层剩余油富集区主要集中在井网控制程度低、注采关系不完善、注入水波及不到和断层遮挡的区域,分布较为零散。针对广利油田油层不同剩余油分布特点,结合油层砂体和原有井网分布状况,分别进行井网优化研究,在具体调整井位的选择上,提出综合考虑调整井钻遇有效厚度、井位处的含油饱和度以及注采对应关系的“三考虑原则”,确保了调整井网方案的针对性。为了解决广利油田油层开发中存在的主要问题,改善开发效果,提高采收率,本次研究以油气藏开发理论为指导,采用确定性建模与随机建模相结合的油藏建模技术,利用质量控制和网格粗化等,最大限度的应用计算机手段,进行油气藏内部结构精细解剖,揭示油气分布规律,建立能描述油气分布状况和流动特征的地质的、岩石物理的、成岩的、构造的、流动的及工程的油藏精细模型。从井网、层系适应性、开发方式和工艺适应性等方面展开油藏工程综合研究,重新精细认识构造和储层,有效解决多年开采中因层间矛盾加剧导致含水上升加快等突出问题[3]。在沉积微相和储层认识的基础上进行数值模拟研究,分析剩余油分布主控因素,找出可采储量平面分布规律,进而对开发效果综合评价,扩边部署产能井拓宽储量接替区带。同时开展单砂层合理井网密度和产能潜力综合评价研究,编制新老井相结合的综合调整方案,为广利油田油层综合治理、提高最终采收率提供科学依据。
[Abstract]:The Lai36 low permeable reservoir is located in the middle of Guangli Oilfield, the fourth member of the oil-bearing zone, with a buried depth of 2500-2730m [1], an oil-bearing area of 4.0km2, and an oil recovery factor of 41.8.The Guangli oil field is located at the eastern end of the central uplift belt of Dongying Sag. It is an integral structural reservoir controlled by five large faults of three levels. The surface condition of low permeability reservoirs is complex and surrounded by planning areas such as Jinhu Galaxy, Logistics Park, Wetland and so on. At present, the difficulties faced by the oil reservoirs in Guangli Oilfield are: the degree of recovery is not high. The oil recovery rate is low, the injection pressure is high and the productivity of production well is insufficient. These problems have seriously affected the high efficiency development of oil field. This paper starts with geological characteristics, seepage characteristics and actual development dynamic characteristics of reservoir in Guangli Oilfield. By using the methods and principles of reservoir geology and reservoir engineering, this paper analyzes in depth the reasons that affect the effect of water injection development, demonstrates the adaptability of development layer, well pattern and well spacing, and puts forward the key factors that affect the effect of water injection development in oil reservoir of Guangli Oilfield. It is suggested that, starting with the percolation characteristics of low permeability reservoirs and the distribution characteristics of reservoir sand bodies, in order to establish effective reservoir connectivity and perfect the corresponding relationship between injection and production, the well spacing of injection and production should be appropriately reduced, and the flow area should be expanded. On the basis of the above research, the remaining oil distribution in Guangli Oilfield is predicted and analyzed. At present, the remaining oil accumulation area of oil reservoir is mainly concentrated in the low level of well pattern control, and the relationship between injection and production is not perfect. According to the distribution characteristics of different remaining oil in Guangli Oilfield, combining with the distribution of sand body and original well pattern of oil reservoir, the optimization of well pattern is studied separately. In the selection of specific adjustment well location, it is proposed that comprehensive consideration should be given to adjusting the effective thickness of well drilling. The oil saturation at the well location and the "three considerations" principle of the corresponding relationship between injection and production ensure the pertinence of the adjustment well pattern. In order to solve the main problems existing in the reservoir development of Guangli Oilfield, improve the development effect and increase the recovery factor, Guided by the theory of oil and gas reservoir development, this study adopts the reservoir modeling technology which combines deterministic modeling with stochastic modeling, and uses quality control and mesh coarsening to maximize the application of computer tools. The fine anatomy of the internal structure of oil and gas reservoir is carried out to reveal the distribution law of oil and gas, and to establish the fine models of geological, petrophysical, diagenetic, structural, flowing and engineering reservoir that can describe the distribution and flow characteristics of oil and gas. Comprehensive reservoir engineering research has been carried out in such aspects as the adaptability of strata, development methods and technology, and the re-fine understanding of structures and reservoirs, In order to effectively solve the outstanding problems such as increasing water cut and increasing water cut due to the intensification of interlayer contradiction in many years of exploitation [3]. Based on the understanding of sedimentary microfacies and reservoir, the numerical simulation is carried out, and the main controlling factors of remaining oil distribution are analyzed. Find out the plane distribution law of recoverable reserves, and then comprehensively evaluate the development effect, expand the reserve replacement zone of extended production wells, and carry out a comprehensive evaluation study on reasonable well pattern density and productivity potential of single sand layer. In order to provide scientific basis for comprehensive treatment of oil reservoir in Guangli Oilfield and improvement of final recovery, a comprehensive adjustment scheme combining new and old wells is worked out.
【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】：TE327;P618.13

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