XM油田M2区块注水开发技术研究

发布时间：2018-03-01 01:15

本文关键词： 低渗透油藏有效驱替压力系统油藏数值模拟注水开发应力敏感　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：XM油田扶杨油藏属于典型的低孔、低渗、非均质性强油藏。在注水开发过程中表现出水井注水困难,注入压力高,而油井基本不受效,油井产液量低的特点。本论文针对该油藏注水开发过程中存在的问题,选取M2区块作为代表区块,通过深化地质认识,基于油藏生产动态资料分析、并结合油藏工程方法、利用油气藏数值模拟技术,对有效注水开发技术进行研究。通过对目前注水开发效果进行评价,明确了目前的开发过程中存在注水困难的问题；对影响注水开发效果的主要因素进行了分析,认清了影响目前注水开发效果的主要原因；进而制定出有效注水开发技术对策。为建立起有效驱替压力系统,根据目前剩余油富集情况,结合油藏工程研究成果,设计了井网加密、注采比优选、补孔补层、提液等调整措施,共9组调整方案,并对这些方案进行了预测、优选。研究结果表明： (1)储层存在应力敏感和启动压力梯度,导致注水困难,应保持合理地层压力,计算得出M2区块合理地层压力为14.2MPa,采油井合理井底流压为2.77MPa,注水井最大井底流压为21.78MPa,最大合理生产压差约为11.43MPa。 (2)区块存在较强的水敏和盐敏,对注入水水质的要求较高,注水开发过程中要考虑注入水的配伍性问题。各区块存在较严重的储层结垢现象,对地层的伤害性较大,应采取深度酸化,近井地带解堵措施。 (3)针对区块存在启动压力梯度偏大的现象,应及时进行井距调整,采用小井距开发,以建立起有效驱替压力系统,M2区块极限注采井距为140m。 (4)通过油藏数值模拟对各调整方案进行模拟预测,结果表明,通过井网加密可建立有效驱替压力系统,改善注水开发效果,加密调整井网的最优注采比为1.27。油藏下一步可采取剩余油富集区井网加密、油井补孔补层、提高配产液量等措施,提高油田采收率,实现油田稳产。
[Abstract]:Fuyang reservoir in XM oilfield is a typical reservoir with low porosity, low permeability and strong heterogeneity. During the process of water injection, it is difficult to inject water into wells, and the injection pressure is high, but the oil wells are basically ineffective. In view of the problems existing in the process of water injection in this reservoir, the M2 block is selected as the representative block. Through deepening the geological understanding, based on the reservoir production performance data analysis, and combined with reservoir engineering methods, the paper selects M2 block as the representative block. The effective water injection development technology is studied by using oil and gas reservoir numerical simulation technology. Through the evaluation of the current waterflooding development effect, the problems of water injection difficulty in the current development process are clarified, the main factors affecting the waterflooding development effect are analyzed, and the main reasons that affect the current waterflooding development effect are clearly recognized. In order to set up an effective displacement pressure system, according to the current remaining oil enrichment situation and combined with reservoir engineering research results, well pattern infill, injection-production ratio optimization, pore filling and reservoir filling are designed. There are 9 groups of adjustment schemes such as liquid extraction and so on, and these schemes are forecasted and selected. The results show that:. 1) the reservoir is sensitive to stress and starting pressure gradient, which makes water injection difficult, so reasonable formation pressure should be maintained. The reasonable formation pressure of M2 block is 14.2MPa, the reasonable bottom-hole flow pressure of production well is 2.77MPa, the maximum bottom-hole flow pressure of water injection well is 21.78MPa, and the maximum reasonable production pressure difference is about 11.43MPa. (2) there is strong water sensitivity and salt sensitivity in the block, and the quality of injected water is required to be high. The compatibility of injected water should be considered in the process of water injection development. Deep acidification and plugging removal measures should be taken in near well area. 3) in view of the phenomenon that the starting pressure gradient is too large in the block, it is necessary to adjust the well spacing in time and develop the small well spacing in order to establish an effective displacement pressure system. The limit injection-production interval of M _ 2 block is 140 m. 4) simulating and predicting the adjustment schemes through reservoir numerical simulation. The results show that the effective displacement pressure system can be established through well pattern infilling, and the water injection development effect can be improved. The optimal injection-production ratio of infilling and adjusting well pattern is 1.27.The next step of reservoir is to take measures such as infill well pattern in rich area of remaining oil, fill hole and pay layer in oil well, and increase the amount of liquid produced, so as to improve oil recovery and realize stable oil production.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.6

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