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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。
The Wamaohe Oilfield, located in Zichang County, Shaanxi Province, is located in the central-eastern part of the northern Shaanxi slope of Ordos Basin. The main reservoir is 2 layers long. The reservoir has the characteristics of good reservoir properties, integrated reservoir integration and large reservoir abundance. However, the reservoirs also have the characteristics of low porosity, low permeability and low oil saturation. They belong to lithologic reservoirs with weak geological structure. After many years of waterflood development, the area has achieved good yields, but it also poses many problems. Rock pores have formed large channels after years of erosion. The injected water will flow along the large channels from the injection wells to the production wells , The remaining oil pores will not be driven out, making a significant drop in oil production. To this end, the use of profile control and water shutoff technology, the large hole blocking, injection of water into the oil pores, the oil well to achieve high yield, stable production, to further enhance oil recovery.