改善特低渗透特高含水严重非均质油藏开发效果的途径

Approaches to EOR of extra low permeability, extra-high water cut and severely heterogeneous reservoirs development through unstable water injection

腰英台油田储层非均质性强，注水开发后，目前已处于高含水期，长时间水驱后，油层高渗带形成大孔道，造成层问动用不均衡的状况，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，运用油藏数值模拟技术，研究合理的注入强度和注入周期，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，为提高采收率提供了理论保障，同时也对类似油藏开发具有重大的现实意义。

With strong heterogeneity of reservoirs, Yaoyingtai Oilfield is now in high water cut stage after many years of waterflooding. Alter prolonged water flooding, large pores and channels are formed in the high permeability zones of the oil reservoirs, resuhing in un- even situation of producing reserves between layers. Conventional waterflooding has been very difficult to enhance oil recovery. Based on the unstable water injection mechanism, by use of numerical reservoir simulation technology, reasonable injection intensity and injec- tion period are studied to develop relevant technology policy. Field tests show that unstable water injection effect is obvious. It can greatly control the natural decline of production, improve waterflood efficiency. It provides a theoretical guarantee for enhancing oil recovery, but also has great practical significance to similar reservoir development.