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在对砂质砾岩、细粉砂岩这2种不同岩性的典型特低渗储层共计28块岩心样品进行室内常规驱替实验、对比实验和铸体薄片浸泡实验的基础上,评价OR和DA这2种不同类型的改性注入剂对各岩样驱替相渗透率和驱油效率的改善情况,分析其改善渗流能力的机理,再对2类改性注入剂的注入浓度进行优选,最后进行现场试验。研究表明,改性注入剂OR在细粉砂岩类特低渗储层中适用性较好,改性注入剂DA在砂质砾岩类特低渗储层中适用性较好,2类改性注入剂均能不同程度的提高驱替相渗透率和驱油效率,并不同程度的降低油水界面张力。浸泡实验表明2类改性注入剂均能使样品孔隙内的填隙物发生溶蚀,改性注入剂DA和OR最合理的注入浓度分别为3 000mg/L和2 000mg/L。最后进行的现场试验表明改性注入剂能使单井注水压力平均下降2.76MPa,日注水量平均增加4.15m3,吸水状况也能得到改善,室内实验和现场应用都取得较好效果。
A total of 28 core samples of two typical reservoirs with different lithologies, such as sandy conglomerate and fine siltstone, were used to conduct conventional flooding experiments, comparative experiments and immersion experiments of cast slabs. The OR and DA two kinds of different types of modified implants improve the permeability of each sample and displacement efficiency, analyze the mechanism of improving the seepage ability, and then optimize the injection concentration of two kinds of modified implants, The final field test. The results show that the modified injection OR has good applicability in ultra-low permeability reservoirs of fine siltstone. The modified injection DA has good applicability in sandy conglomerate-type ultra-low permeability reservoirs, and two types of modification Injectables can improve the displacement permeability and oil displacement efficiency to varying degrees, and to some extent reduce the oil-water interfacial tension. The immersion experiments show that the two types of modified implants can cause the dissolution of the interstitial material in the pores of the sample. The most reasonable injection concentrations of the modified implants DA and OR are 3 000 mg / L and 2 000 mg / L, respectively. The final field test shows that the modified injection can make single well water injection pressure drop average 2.76MPa, daily water injection an average increase of 4.15m3, water absorption can also be improved, indoor experiments and field applications have achieved good results.