大庆油田是一个多油层的砂岩油田,因为天然能量小,采用早期注水保持油层能量的方式开采。在油田北部油水过渡带SB区D块,油层性质和原油物性比纯油区差,注水井的吸水能力又低,开采效果明显变差。针对过渡带稠油段的特点及存在的问题,开展了岩心模拟试验,在此基础上,在该区对注水井采用溶剂酸化和选择性酸化增注措施,注水量有了较大的提高,油井相继受效,与此同时,油井采取了溶剂压裂及选择性压裂的增产措施,提高了单井产量,增加了出油厚度,改善了D块的开采效果。 Daqing Oilfield is a multi-layer sandstone oilfield, because of its small natural energy, the use of early water injection to maintain reservoir energy extraction. In Block D of Block SB of the oil-water transitional zone in the northern part of the oilfield, the nature of the oil layer and the physical properties of the crude oil are worse than that of the pure oil zone. The water absorption capacity of the injection well is also low, and the mining effect is obviously deteriorated. In view of the characteristics and existing problems of the heavy oil in the transitional zone, a core simulation test was carried out. On the basis of this, the water injection amount was greatly improved by using solvent acidizing and selective acidizing injection measures in the injection well in this area. In the meantime, the oil wells have taken measures to increase production of solvent fracturing and selective fracturing, which has increased single-well production, increased oil thickness and improved the mining effect of D block.