彩9井区西山窑组油藏注采调整方案及跟踪研究

发布时间：2018-03-08 18:23

本文选题：低渗油藏　切入点：数值模拟　出处：《长江大学》2017年硕士论文　论文类型：学位论文

【摘要】：彩9井区西山窑组油藏为低渗特低渗油藏,地质情况复杂,部分区域天然微裂缝发育、储层水敏现象严重。早期开发过程中,由于对油藏地质特征认识存在有一定偏差,采取了大井距开发、强注强采、未进行防膨注水等开发政策,导致目前采油速度和动用程度均处于较低水平,开发效果极差。截至2011年9月30日,彩9区西山窑组油井开井数58口,仅占总数四分之一。油井大面积关井,油井利用率低。目前全区懫出程度为22.5%,综合含水88.2%,含水小于60%的油井占25%,含水80%的油井占57%。注采矛盾进一步加剧。注采总压差逐步增大至10MP以上,压力场分布极不均匀,采油井水窜,高含水和供液不足的现象并存。为改善油藏开发效果,提高油田开发经济效益,前期已经利用现代油藏工程方法、系统工程理论、优化方法,进行了注采方案的设计调整、预测、分析、优化,本次研究是对前一项目的跟踪研究,通过详细调研掌握了目标油藏的构造特征,沉积特征,储层特征,流体特征,温度压力系统,油藏类型及特征,地质储量等,并分别从产量状况、储采平衡状况、产液量与含水率变化、注采比平衡、能量保持状况、水驱动用储量程度、措施增产状况方面,研究了彩9井区的开发形势;分析出了目前存在的主要问题,包括渗流能力下降、油井水淹水窜严重、注采井网适应性差;结合油藏开发形势,提出小井距注采决策,并给出了加密区的选择依据。通过现场示踪剂测试、干扰试井以及动态连通性研究成果与油井见水见效情况对比可以发现,加密区裂缝分布复杂、立足水驱实现注采对应难度极大。通过数值模拟方法确立了提液+压裂+周期注水方案为优选方案,并通过最优化方法把优化后与未经过优化时的开发效果进行了对比,发现优化后的方案累积产油明显提高,有效提高了经济效益。通过分析加密井的测井结果发现油层上部存在可观的剩余储量,加上该区高角度裂缝发育,针对这一现象以及目前严峻的生产形势,提出注空气驱、水气交注以及泡沫驱三种新设想,并特别分析了注空气驱在彩南区块的可行性,并建议选择C2115井区作为先导试验区块;另外鉴于其他两种方法在其他类似油田也已经取得了较好的应用效果,因此也建议作为今后彩南油田剩余油挖潜的试验方法选择。
[Abstract]:The Xishanyao formation reservoir in Cai9 well area is a low-permeability and ultra-low-permeability reservoir with complex geological conditions, natural micro-fractures in some areas and serious water sensitivity phenomenon. In the early development process, there were some deviations in understanding the geological characteristics of the reservoir. The development policies, such as large well spacing development, strong injection and strong production, and no anti-swelling and waterflooding, have resulted in a low oil recovery rate and production degree at present, and the development effect is extremely poor. The number of wells opened in Xishanyao formation of Cai9 District is 58, accounting for only 1/4 of the total. The oil well utilization ratio is low. At present, the degree of oil well production in the whole area is 22.5. the comprehensive water cut is 88.22.The oil wells with water less than 60% occupy 25 wells, and the wells with water cut 80% occupy 57 wells. The contradiction between injection and production is further aggravated. The total pressure difference between injection and production gradually increases to more than 10MP, and the pressure field distribution is extremely uneven. The phenomena of water channeling, high water cut and insufficient supply of liquid coexist in production wells. In order to improve reservoir development effect and increase economic benefit of oilfield development, modern reservoir engineering methods, system engineering theory and optimization methods have been used in the early stage. The design, adjustment, prediction, analysis and optimization of the injection-production scheme are carried out. This study is a follow-up study of the previous project. Through detailed investigation and investigation, we have mastered the structural characteristics, sedimentary characteristics, reservoir characteristics and fluid characteristics of the target reservoir. Temperature and pressure systems, reservoir types and characteristics, geological reserves, etc., respectively, from the production status, the balance of storage and production, the changes of liquid production and water cut, the balance of injection-production ratio, the state of energy conservation, the degree of water drive reserves, In terms of measures to increase production, the development situation of Cai9 well area is studied, and the main problems are analyzed, including the decline of percolation capacity, the serious water flooded water channeling in oil wells, the poor adaptability of injection-production pattern, and the development situation of oil reservoir. The decision of injection and production of small well spacing is put forward, and the selection basis of infill zone is given. It is found that the distribution of fractures in infill zone is complex through field tracer test, interference well testing and research results of dynamic connectivity compared with the effect of oil well water breakthrough. It is very difficult to realize injection-production correspondence based on water flooding. By means of numerical simulation, the fracturing cycle water injection scheme is established as the optimal selection scheme, and the development effect after optimization is compared with that without optimization. By analyzing the logging results of infill wells, it is found that there are considerable remaining reserves in the upper part of the reservoir and the development of high angle fractures in this area. In view of this phenomenon and the severe production situation at present, three new ideas of air flooding, water gas injection and foam flooding are put forward, and the feasibility of air injection flooding in Cainan Block is analyzed, and the C2115 well area is suggested as the pilot test block. In addition, since the other two methods have been applied well in other similar oilfields, it is also suggested that they should be selected as the test methods for tapping the remaining oil potential in Cainan Oilfield in the future.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.6

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