摘要
本研究在模拟北北块一区萨Ⅲ4-10油层条件下进行。在尺寸4.5×4.5×30(cm)、纵向渗透率变异系数为0.72、平均渗透率0.482×10-3～586×10-3μm2的石英砂胶结岩心上,使用黏度为10 mPa.s的模拟油,在45℃下考察了水驱后注入不同高浓聚合物段塞对驱油效果的影响及常规聚合物驱不同阶段注高浓聚合物对驱油效果的影响,结果如下。高浓聚合物聚合物用量越大,提高采收率幅度越大,但增加幅度逐渐变缓,聚合物用量为1500、2000、2500、3000(PV.mg/L)时提高采收率分别为15.75%、17.91%、19.84%、21.46%;在聚合物用量相同的条件下(1500 PV.mg/L、2000 PV.mg/L),浓度为2500 mg/L和1000 mg/L聚合物段塞交替注入越频繁,提高采收率幅度越大。在聚合物用量相同的条件下(2000 PV.mg/L),常规聚合物驱不同阶段转注高浓度聚合物溶液,转注的时期越早,提高采收率幅度越大。
The research was conducted,based on the simulation of the Beibei block area SaⅢ4-10 oil layer,,on epoxy cemented quartz sand cores 4.5×4.5×30 cm,of average permeability 482×10-3～586×10-3μm2 and vertical permeability variation coefficient 0.72 and with a simulation oil of viscosity 10 mPa.s used.The enhancement in oil recovery（EiOR） by various sizes of high concentration of polymer slug and selection of high concentration of polymer solution slug injecton timing after the water flood phased ended are investigated at 45℃ and following results are obtained.The bigger the amount of high concentration polymer,the greater the range of enhanced oil recovery,but the range of increase became slow gradually.At polymer use level of 1500,2000,2500,3000 PV·mg/L,the enhancing recovery by slug were 15.75 %,17.91 %,19.84 %,21.46 % respectively.At equal polymer use level（1500 PV·mg/L or 2000 PV·mg/L）,the more frequent the alternating injection with the concentration of 2500 mg/L and 1000 mg/L polymer slug,the greater the range of enhanced oil recovery.At equal polymer use level（2000 PV·mg/L）,when injected at different stages of conventional polymer flooding,the earlier the injection of high concentration polymer flooding,the greater the range of enhanced oil recovery during polymer flooding stage.
出处
《油田化学》
CAS
CSCD
北大核心
2010年第2期158-161,共4页
Oilfield Chemistry
基金
国家自然科学基金重点项目"低渗透油层提高驱油效率的机理研究"(项目编号50634020)
关键词
高浓聚合物
二类油层
提高采收率
注入时机
polymer solution with high concentration
Sub-layers
moment of injection
enhancement in oil recovery
