倾斜泥质夹层对SAGD开发效果的影响

The effects of incline heterolithic strata on SAGD development

以加拿大长湖油田McMurray组油砂储层为研究对象,利用数值模拟方法,对注采井组井间的倾斜泥质夹层进行表征,模拟对比了倾斜泥质夹层的倾斜角度、夹层间距、延展长度对蒸汽辅助重力泄油(SAGD)开发效果的影响。研究表明,注采井间的倾斜泥质夹层(IBIP)对SAGD生产指标影响较大,在夹层间距20~40 m IBIP型的模型中,夹层倾斜角度越大、间距越小、延伸长度越长,则产量高峰时间越推迟滞后,产油峰值越低,累积产油量逐渐增大。夹层间距大于40 m的IBIP型的模型,倾斜角度越大、间距越大、延展长度越短,则产油高峰时间会提前,产油峰值降低。因此在倾斜角度3°、夹层间距40 m、延伸长度12 m处达到整体日产油峰值最高值;在倾斜角度8°,夹层间距20 m处达到整体最终累积产油量最高值。研究结果可指导下一步双水平井SAGD井位部署。

The Inclined heterolithic strata has certain influence on the development effect of dual horizontal well,SAGD.The McMurray group oil sand reservoir of Long Lake Oil Field in Canada was taken as the object of research,in which,the numerical simulation method was adopted,the features of the inclined heterolithic strata of wells in-between of injection-production well group,the simulated contrast was conducted on the impact of the inclined heterolithic strata’s angle of inclination,the interlayer interval interlayers,and the extended length on the development effect of SADG.The research shows that the inclined muddy intercalation of injection-production well(IBIP)had a great impact on the production index of SAGD;and,for the model of IBIP types whose interlayer interval is 20~40 m,with the increasing of interlayer’s angle of inclination,lessening of the interlayer interval,and increasing of the extended length,the production peak hour will become late,and the oil production peak value will become lower,and the cumulative oil production will gradually increase.As for the models of IBIP type whose interlayer interval is more than 40 m,the greater the inclined angle,and the larger the interval,and the shorter the extended length,the oil production peak hour will bring forward and the oil production peak value will reduce much more.So,when the inclined angle is 3°,the interlayer interval is 40 m,and the extended length is 12 m,the daily oil production will reach to the highest peak value on the whole.And when the inclined angle is 8°,and the interlayer interval is 20 m,the final cumulative oil production will reach to the highest value on the whole.This result has an important significance on guiding further arrangement of the location of dual horizontal well SAGD.