摘要
高含水断块油藏开发末期构造高部位油井在关井一段时间后,会产生剩余油再富集现象。目前关于剩余油再富集速度的研究中,对剩余油运移过程的影响因素考虑不够全面,影响计算精度。针对该问题,在对运移中剩余油再富集受力分析的基础上建立小油滴状和柱状剩余油再富集速度模型,通过正交试验确立2种剩余油再富集速度的主要敏感因素,并建立了2种剩余油再富集速度及再富集时间图版。研究结果表明:存在驱替压差时,储层渗透率为影响2种剩余油再富集速度的主控因素;当储层渗透率一定,驱替压差的增大和原油黏度的减小有利于2种剩余油再富集速度的增大;同一注采井距位置处的小油滴距离孔隙中滞留柱状剩余油越近,聚集过程中剩余油再富集时间越长,但数值上增加不多。该研究对高含水油藏剩余油再富集潜力区评价具有借鉴意义。
At the end of the development of high water cut fault-block oil reservoirs,the phenomenon of remaining oil re-enrichment will occur in wells located in the structural high position after the well is shut in for a period of time.In the current research on the re-enrichment velocity of remaining oil,consideration of inflencing factors of the migration process of remaining oil is not comprehensive enough,which affects the calculation accuracy.To address this problem,based on the microscopic mechanical analysis of the remaining oil in the migration,the re-enrichment velocity models of small-oil-droplet-shaped and column-shaped remaining oil were established.The main sensitive factors of the re-enrichment velocities of two kinds of remaining oil were clarified through orthogonal experiment,and the chart of two kinds of remaining oil re-enrichment velocities and re-enrichment times were established.The results show that when there is a displacement pressure difference,reservoir permeability is the main controlling factor affecting the re-enrichment velocities of two kinds of remaining oil.When the reservoir permeability is certain,the increase of displacement pressure difference and the decrease of crude oil viscosity are conducive to the increase of two kinds of remaining oil re-enrichment velocities.The closer the small oil droplets at the same injection production well distance to the column-shaped remaining oil in the pores,the longer the time of remaining oil re-enrichment in the accumulation process,but the value increase is small.This study has reference significance for evaluating the re-enrichment potential areas of remaining oil in high water cut oil reservoirs.
作者
孔维军
李立峰
张建宁
苏书震
师国记
黄耀
张美丹
KONG Weijun;LI Lifeng;ZHANG Jianning;SU Shuzhen;SHI Guoji;HUANG Yao;ZHANG Meidan(No.1 Oil Production Plant,Jiangsu Oilfield Company,SINOPEC,Yangzhou 225265,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2024年第3期503-511,共9页
Fault-Block Oil & Gas Field
基金
国家自然科学基金面上项目“致密油藏多段压裂水平井时空耦合流动模拟及参数优化方法”(51974343)。
关键词
高含水油井
剩余油
再富集速度
敏感因素
储层渗透率
high water cut oil wells
remaining oil
re-enrichment velocity
sensitive factors
reservoir permeability
