摘要
油田开发中后期,地下剩余油的评估一直是油田开发的重要工作。当前比较精确的评估工作是在开发区块钻更多的加密井,并利用测量的井曲线进行剩余油评价,但这种方式会增加更多的开发成本。为此,依据油田采油井开采过程中的实际含水率推演地下岩层剩余油饱和度状况有助于油层开采方案的制定。针对岩心样品实验测定的油水相对渗透率反映了产水率与含水饱和度之间的理论关系。依据油水两相渗流理论,应用大庆长垣6口密闭取心井17块岩样的相对渗透率实验数据,研究给出由孔渗参数计算的因次法渗饱公式系数,进而构建由含水率计算含水饱和度的公式。依据该公式可以得出不同孔渗性质的储层,即使产水率一致,储层层内的剩余油饱和度并不相同的规律认识。将研究成果应用于研究区1口新钻加密井剩余油饱和度的预测中,给出了与油藏开发相符合的开采建议,取得好的应用效果。
In the middle and later stages of oilfield development,the evaluation of underground remaining oil is an important task.The current assessment is to drill more infill wells in the development block and use the measured well logs to evaluate the distribution of the remaining oil,but this treatment increases development costs.Deducing the remaining oil saturation of the underground rock formation based on the actual water production rate of the oil field production well is helpful for the development of oil production plan.The relative oil-water permeability measured on the core samples experimentally reflects the theoretical relationship between the water production rate and water saturation.Based on the oil-water two-phase seepage theory,the experimental data of the relative permeability of 17 rock samples from 6 closed core wells in Daqing Changyuan oilfield were applied to study the coefficients of the index percolating saturation formula based on the porosity and permeability parameters,and the formula for calculating water saturation from water production rate was constructed.According to this formula,it can be concluded that reservoirs with different porosity and permeability properties,even if the water production rate is the same,the remaining oil saturation in the reservoir is not the same.The research results are applied to the prediction of the remaining oil saturation of a newly drilled infill well in the study area,and the production suggestions consistent with the reservoir development are given,and good application results are obtained.
作者
张美玲
张永超
任雅楠
樊家屹
ZHANG Mei-ling;ZHANG Yong-chao;REN Ya-nan;FAN Jia-yi(School of Earth Science,Northeast Petroleum University,Daqing 163318,China)
出处
《科学技术与工程》
北大核心
2021年第4期1327-1333,共7页
Science Technology and Engineering
基金
黑龙江省自然科学基金(LH2020D007)
国家自然科学基金(41274132)。
关键词
变系数
相对渗透率
含水率
剩余油饱和度
渗饱公式
variable coefficient
relative permeability
water production rate
remaining oil saturation
percolating saturation formula
