不稳定注水提高特低渗油藏采收率

摘要

Yaoyingtai oilfield in a river deltas is of strong reservoir heterogeneity .After water flooding ,due to unbalanced reservoir situ-ation ,it is very difficult for Conventional water flood to enhanceoil recovery .Based on Unstable water -based mechanism ,taking block DB34 central well groups as study object ,this paper focuses on numerical reservoir simulation techniques ,different Strength and instability different injection cycle studies and the development of relevant technology policy .Field tests show that unstable water injection effect is ob-vious ,and can greatly control the natural decline ,improving water efficiency .This research not only provides theoretical basis for DB34 block further expansion of unstable water injection test range ,improving the water flooding ,but also has great practical significance in the same reservoir development .%针对松辽盆地腰英台油田河流－三角洲沉积的储层具有非均质性强，注水开发后，储层动用不均衡的状况，以及常规注水开发已很难再提高采收率的难题，基于不稳定注水的机理，以DB34区块中部井组为研究对象，运用油藏数值模拟技术，研究不同注入强度和不同注入周期的不稳定注水，并制定相关技术政策。矿场试验表明不稳定注水效果明显，可以大幅度控制自然递减，提高注水效率，研究不仅为DB34区块进一步扩大不稳定注水试验范围，改善水驱开发效果，提高采收率提供了理论保障，同时对类似油藏开发具有重大的现实意义。