摘要
由于原油及聚合物-降粘剂溶液具有较高的粘度,导致胜利油区聚合物-降粘剂复合驱注入井的注入量往往因为无法达到预定的配注要求而被迫进行间歇生产,且目前尚没有明确的方法用以确定聚合物-降粘剂复合驱的极限注入速度,严重制约了稠油油藏化学驱技术的推广应用。基于数理统计原理和油藏数值模拟等方法,首先建立孤岛油田东区Ng4~1-5~1单元聚合物-降粘剂复合驱的典型数值模拟模型,然后采用PB试验设计进行主控因素筛选,最后借助多元回归分析法建立聚合物-降粘剂复合驱无因次吸水指数预测模型,并以此为基础建立聚合物-降粘剂复合驱注入速度界限的确定方法。研究结果表明:数值模拟方案和验证方案所对应的无因次吸水指数的实算值与预测值的吻合度较高,两者平均误差仅为1.71%,说明所建立的无因次吸水指数预测模型具有可靠性;当聚合物质量浓度为2 000 mg/L、降粘剂质量分数为0.4%、降粘剂降粘率为90%、注入段塞尺寸为0.4 PV时,目标区块的极限注入速度为0.106 4 PV/a,计算结果与矿场实际注入数据(0.11 PV/a)相近。
It is always hard to meet the requirement of injection allocation rate of the injector in the Shengli Oilfield due to high viscosity of crude oil and polymer/viscosity reducer solution,and the wells are forced to produce intermittently.There is no specific way to determine the maximum injection speed of the polymer/viscosity reducer combination flooding,which restricts the chemical flooding development in the heavy oil reservoirs.Based on statistics principle,reservoir numerical simulation and other methods,the typical numerical simulation model of the combination flooding was established for the Ng41-51 unit of eastern area in Gudao Oilfield,and the main control factors were screened out by Plackett-Burman experimental design.A prediction model for dimensionless water injectivity index of the polymer/viscosity reducer combination flooding was established finally by multiple regression analysis.On this basis,a method for calculating the injection rate limit of the polymer/viscosity reducer combination flooding was formed.The results show that the calculated value and predicted value of the dimensionless water injectivity index gained by the numerical simulation plan agrees well with that from the verification plan with an average error of 1.71%,which verifies the reliability of the prediction model.When the polymer concentration was 2 000 mg/L,the viscosity reducer concentration was 0.4%,the viscosity reduction rate was 90%and the injected slug size was 0.4 PV,the calculated limited injection rate of the target area was 0.106 4 PV/a.It is very close to the injection data(0.11 PV/a)in the actual situation in the field.
作者
夏晞冉
XIA Xiran(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2018年第6期89-95,共7页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"高温高盐油田化学驱提高采收率技术"(2016ZX05011-003)
关键词
稠油油藏
聚合物-降粘剂复合驱
数值模拟
无因次吸水指数
PB试验设计
定量表征
heavy oil reservoir
polymer/viscosity reducer combination flooding
numerical simulation
dimensionless water injectivity index
Plackett-Burman design
quantitative characterization
