瓦窑堡油田羊马河区调剖技术研究

瓦窑堡油田羊马河区位于陕西省子长县境内,构造位置处于鄂尔多斯盆地陕北斜坡的中东部。主力油层为长2层。油层具有储油物性较好,油藏整装连片,油藏丰度大等特点。但油藏同样具有低孔、低渗、低含油饱和度的特点,属于地质构造活动较弱的岩性油藏。经过多年来的注水开发作业,该区已经取得不错的产量,但同时也带来了很多问题,岩石孔隙经过长年的冲刷已经形成大孔道,注入水将沿着大孔道从注水井流入采油井,其余含油孔隙将无法被驱出,使得产油量大幅度直线下降。为此,采用调剖堵水技术,将大孔道封堵,注入水进入含油孔隙,使油井达到高产、稳产的目的,进一步提高采收率。

Research on the Profile Control Technology for Yangmahe Oil Region in Wayaobao Oilfield

Yangmahe oil region in Wayaobao oilfield is located in Zichang County, Shaanxi Province. Tectonic position is in mid-east of Ordos basin. The main reservoir is Chang 2 layer. The reservoir has characteristics of good reservoir physical properties, contiguous reservoir, and large oil bearing abundance and so on. However, the reservoir has low porosity and low permeability, low oil saturation; it is weak tectonic activity lithologic reservoir. After years of water flooding operation, the district has made a good yield, but it also brings a lot of problems, rock pores formed after years of erosion become large pores, injecting water flows in wells along the large pore, other remaining oily pores will not be driven out, so oil production plummets dramatically. For this reason, water can injected into oil pores by using EOR technology for plugging large pores, so the well recovery can be further improved.