朝55区块开发规律及细分注水调整研究

发布时间：2018-05-20 17:39

本文选题：水驱规律 + 相对渗透率曲线　；参考：《东北石油大学》2015年硕士论文

【摘要】：本文以朝阳沟油田55区块为研究对象,基于相渗曲线和矿场资料对朝55区块进行水驱规律和开发规律研究。通过对岩心相对渗透率曲线的归一化得到能够描述渗流特征的相渗曲线,在此基础上进行多层相渗数据复合得到能够反映全区渗流特征的相渗曲线,研究无因次采液、采油指数和含水率的变化规律,分析发现朝55区块无因次采液指数都呈先降后升趋势。研究朝55区块的水驱规律曲线及产量递减规律曲线,建立多因素影响递减规律的理论模型,考虑各因素对区块递减率的影响。从水驱采收率、存水率、水驱指数和含水率四个方面对水驱开发效果进行评价,与实际的生产井史数据进行对比,以实际数据为依据,考虑启动压力梯度的影响,对童宪章所推导的半经验公式进行改进,给出开发指标与采收率的预测方法,预测得到朝55区块的采收率为23%左右。根据不同层段间平均渗透率级差,设计室内实验方案。统计资料和数值模拟结果,分析层段间剩余油分布状况和采出程度差异,绘制动用差异柱状图,确定加强层段和限制层段。根据区块的合理注采比和区块产液量,由注采比定义式确定区块注水量,在区块注水量和新老注水井的配注量比例的基础上,通过区块的数值模拟研究,获得新老井配注强度比例,综合理论和实验方法,从而确定各类油层的注水强度。研究结果表明:随着高低渗透间流量比的变大,不同方案的阶段采出程度差值呈现先增大后减小的趋势;且渗透率级差越大,高低渗透层之间的最佳流量比越小。应用数值模拟技术,确定朝55区块目前含水率为54.57%,含水率处在60%~80%和40%~60%的阶段,此时新老注水井的配注量比例应为1.1:1、1.4:1。根据新老注水井的比例和各类油层的配注比得到各类油层的注水强度。
[Abstract]:In this paper, the water drive law and development law of Chao 55 block are studied on the basis of phase permeability curve and field data. By normalizing the relative permeability curve of the core, the phase and permeability curves can describe the seepage characteristics, and on the basis of this, the multi-layer permeability data are combined to obtain the phase and permeability curves which can reflect the seepage characteristics of the whole area, and the dimensionless fluid extraction is studied. By analyzing the variation of oil recovery index and water cut, it is found that the dimensionless oil recovery index of Chao55 block is decreasing first and then rising. The water drive law curve and production decline law curve of Chao 55 block are studied. The theoretical model of multi-factor influencing decline law is established, and the influence of each factor on block decline rate is considered. The water drive development effect is evaluated from four aspects: water drive recovery, water storage rate, water drive index and water cut, and compared with the actual production well history data. Based on the actual data, the effect of starting pressure gradient is considered. The semi-empirical formula derived by Tong Xianzhang is improved, and the prediction method of development index and recovery factor is given, and the recovery of Chao55 block is estimated to be about 23%. According to the average permeability difference between different layers, the experimental scheme in the design room. The statistical data and numerical simulation results are used to analyze the distribution of residual oil and the difference of recovery degree between layers, and to draw the histogram of the difference between the layers, and to determine the strengthening and limiting layers. According to the reasonable injection-production ratio and the production rate of the block, the water injection rate is determined by the injection-production ratio definition formula. Based on the injection rate of the block and the proportion of the new and old water injection wells, the numerical simulation of the block is carried out. The injection intensity ratio of new and old wells is obtained, and the water injection intensity of various reservoirs is determined by synthesizing the theory and experimental methods. The results show that with the increase of the flow ratio between high and low permeability, the recovery degree difference of different schemes increases first and then decreases, and the greater the permeability difference, the smaller the optimal flow ratio between high and low permeable layers. By using the numerical simulation technique, it is determined that the current water cut of Chao55 block is 54.57 and the water cut is at the stage of 60% and 40% respectively. At this time, the ratio of new and old water injection wells should be 1.1: 11.4: 1. According to the proportion of new and old water injection wells and the injection ratio of all kinds of reservoirs, the water injection intensity of all kinds of reservoirs is obtained.
【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】：TE357.6

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