摘要
针对普通稠油油藏蒸汽吞吐中后期存在地层压力低、油汽比低、常规注水补能易窜流等问题,以胜利油田C油藏为目标,利用油藏数值模拟开展了冷驱热采可行性研究。首先对降黏剂、聚合物、氮气泡沫3种常温驱替介质机理进行数值模拟表征,然后再对其开采特征进行对比得出最优常温驱替介质,最后结合采出端复合吞吐效果明确冷驱热采的可行性。研究结果表明:对比3种不同常温驱替介质的开发效果,聚合物驱投入产出比最高,为2.06;氮气泡沫驱累计增油量最高,为1884t,但是投入产出比仅为1.23;降黏剂驱累计增油量最低,仅为723t;综合考虑选择聚合物作为最优常温驱替介质。相比单一冷驱和单一热采,冷驱热采累计增油量分别增加7328和3034 t。采用冷驱热采开发技术后可有效降低水油流度比,延缓压力递减,延长吞吐周期,此外在压力得到补充的前提下可适当提液增大生产压差,改善冷驱热采开发效果。
To address the challenges in ordinary heavy oil reservoirs during the mid-to-late stages of steam huff and puff operations,such as low reservoir pressure,low oil-steam ratio,and channeling risks associated with conventional water injection for energy replenishment,this study focused on the C reservoir in Shengli Oilfield.Reservoir numerical simulation was employed to investigate the feasibility of composite cold drive and thermal recovery.Firstly,the mechanism of three kinds of normal temperature displacement media,such as viscosity reducer,polymer,and nitrogen foam,was characterized by numerical simulation.Then,the optimal normal temperature displacement medium was obtained by comparing its recovery characteristics.Finally,the feasibility of composite cold drive and thermal recovery was clarified by combining the effect of composite huff and puff operations at the production end.The results show that compared with the development effects of three different normal temperature displacement media,the input-output ratio of polymer flooding is up to 2.06,and the cumulative oil increment of nitrogen foam flooding is up to 1884 t,but the input-output ratio is only 1.23.The cumulative oil increment of viscosity reducer flooding is only 723 t.After careful consideration,polymer flooding is selected as the optimal normal temperature displacement medium.Compared with pure cold drive and pure thermal recovery,the cumulative oil production after composite cold drive and thermal recovery increases by 7328 t and 3034 t,respectively.Using composite cold drive and thermal recovery technology can reduce the oil-water mobility ratio,delay the pressure decline,and extend the huff and puff cycle.In addition,under the premise that the pressure is supplemented,the liquid production and the production pressure difference can be appropriately increased to improve the composite cold drive and thermal recoveryeffect.
作者
李洪毅
李关虎
LI Hongyi;LI Guanhu(Petroleum Development Center,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257000,China)
出处
《油气地质与采收率》
北大核心
2025年第2期104-113,共10页
Petroleum Geology and Recovery Efficiency
关键词
普通稠油
蒸汽吞吐
冷驱热采
数值模拟
提高采收率
ordinary heavy oil
steam huff and puff
cold drive and thermal recovery
numerical simulation
enhanced oil recovery
