超前注水提高特低渗透油田开发效果

安塞油田是鄂尔多斯盆地石油地质储量最大的整装级大油田，也是世界著名的特低渗透油田。因此，进一步提高开发效果和经济效益及最终采收率是油田开发首要任务，安塞油田在大面积同步注水开发取得较好效果的同时，不断探索开发的新途径，通过对超前注水机理的研究及现场试验，建立了有效的驱替压力系统，使地层压力始终保持较高的水平，降低了因地层压力下降造成的地层伤害，抑制了油井的初始含水率，从而提高了投产初期油田的产量，使得油田能够保持较长的稳产期，减缓了递减，提高最终采收率。

Effects of Advanced Waterflooding in Extra-permeability Oilfield Development

Ansai oilfield has the largest oil geological reserves in Ordos Basin,and the most well know extra permeability oilfield in the world, too.Therefore, to enhance the development effects, economical benefit,and ultimate recovery of it is the most important task of engineers. New approaches are being continually searched after, while better effects have been made by conventional waterflooding over a large area in Ansai oilfield. Advanced waterflooding keeps formation pressure in high level, reduces formation damage caused by formation pressure decline and controlls the initial water cut, thus enhancing the initial individual well producing rate, keeping oil well long stable production period, slowing down the degression, and beneficial to enhancing ultimate recovery by establishing the effective driving pressure.