尕斯N区块剩余油分布及挖潜研究

发布时间：2018-04-04 08:07

本文选题：采收率　切入点：油水井数比　出处：《西南石油大学》2015年硕士论文

【摘要】：尕斯N区块于1990年10月投入开发,截至2014年4月底已经进入高含水期,油藏地质特征复杂,储层砂体分布分散,连片性差,造成剩余油分布复杂,认识剩余油和开采剩余油是油藏开发调整的重点。研究剩余油的方法有很多,本文主要采用油藏数值模拟方法模拟剩余油分布,并通过数值模拟方法筛选出适合本油藏的开采剩余油的方案,具体的研究方法和相应的成果为： (1)从储层物性、润湿性和非均质性了解区块的地质特征,通过采收率、存水率、水驱指数、体积波及系数和含水率的分析对油藏的开发效果作出评价,从中发现开发效果较差的油层组,通过对无因次采液采油指数分析把握住油藏的提液时机,分析油藏的合理油水井数比及合理井网密度为井网加密措施提供理论基础。 (2)采用三维地质建模软件Petrel建立油藏的地质模型,模型分为4个油层组58个小层。利用Eclipse黑油模拟器再现油藏23年的生产历史,根据剩余油的分布情况分析剩余油的富集成因并作出剩余油水淹平面图,根据水淹平面图确定油水井的补孔、堵水和调剖措施,结合剩余油储量丰度图给出加密井的井位。 (3)优化油藏的注采比,确定一个合理的值,在此基础上设计不同的单井措施方案、井网加密方案和增注提液方案,从2014年4月预测到2025年,根据油藏累计产油量、油藏含水率和油藏地层压力选出最佳的挖潜方案。 (4)主要创新点：采用油水相对渗透率比值拟合法对油藏采收率进行筛选,选出能反映油藏实际的采收率值；利用油水相对渗透率表示油水井数比公式。
[Abstract]:Gasi N block was put into development in October 1990. By the end of April 2014, it had entered a high water cut period. The geological characteristics of the reservoir are complex, the distribution of reservoir sand bodies is dispersed, and the continuity is poor, resulting in the complex distribution of remaining oil.Understanding remaining oil and producing remaining oil are the key points of reservoir development adjustment.There are many methods to study residual oil. This paper mainly uses reservoir numerical simulation method to simulate the distribution of remaining oil, and through the numerical simulation method to screen out the scheme suitable for the remaining oil production in this reservoir. The specific research methods and corresponding results are as follows:1) to understand the geological characteristics of the block from the reservoir physical properties, wettability and heterogeneity, and to evaluate the development effect of the reservoir through the analysis of oil recovery, water storage rate, water drive index, volume sweep coefficient and water cut.It is found that the reservoir group with poor development effect. Through the analysis of dimensionless recovery oil recovery index, the time of oil extraction is grasped, and the reasonable oil-water well number ratio and reasonable well pattern density are analyzed to provide the theoretical basis for the well pattern infilling measures.2) the geological model of the reservoir is established by using the 3D geological modeling software Petrel. The model is divided into 58 sub-layers of 4 reservoirs.The Eclipse black oil simulator is used to reproduce the production history of the reservoir for 23 years. According to the distribution of remaining oil, the causes of remaining oil enrichment are analyzed and the residual oil flooding plan is made. According to the water flooding plan, the measures of filling hole, plugging water and profile control are determined.The well location of infill well is given according to the abundance diagram of remaining oil reserves.On the basis of optimizing the injection-production ratio of oil reservoir, determining a reasonable value, designing different single well measures, well pattern infilling scheme and increasing injection extraction scheme, from April 2014 to 2025, according to the cumulative oil production of the reservoir,Reservoir water cut and reservoir formation pressure are selected to select the best way to tap potential.The main innovation points are as follows: oil / water relative permeability ratio fitting method is used to screen oil recovery factor, and oil / water relative permeability is used to express oil / water well number ratio formula.
【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】：TE327

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