污水配制活性碱/聚二元复合驱体系实验研究

EXPERIMENTAL RESEARCH ON ACTIVE ALKALI-POLYMER COMBINATION FLOODING SYSTEM WITH PRODUCED WATER

在碱/聚合物二元复合驱现场试验过程中,碱与配制用污水或地层水出现不匹配的问题,造成地面管线大量结垢及驱油体系性能大幅度下降。为解决这一问题,以大港羊三木油田三断块馆Ⅱ上油组油藏为依托,开展了污水配制碱/聚二元复合驱体系评价实验研究。选用污水匹配的活性碱(多元复合碱)及碳酸钠进行对比试验,在羊三木油田污水条件下,活性碱与污水的匹配性较好,比碳酸钠溶液的油水界面张力低2个数量级,达到10-3mN/m,抗钙镁能力达到500mg/L,并且与原油的乳化性强;二元复合驱体系对五种聚合物与碱进行了配伍性实验,其中污水聚合物HTPW-111与碱的匹配性好。研究表明,污水配制的活性碱/聚二元复合驱体系保持了聚合物驱的增黏性和降低油水界面张力的特性。

In the field testing process of alkali-polymer combination flooding,the alkali compounding with produced water or formation water appears unmatched,which brings about the crustation of ground pipeline and performance descent of the displacement system.Under the reservoir condition of upper Ng groupⅡ,Yangsanmu Block 3,Dagang Oilfield,alkali-polymer combination flooding dissolved with produced water is investigated.The matching of active alkali with produced water is better than the sodium carbonate.The interface tension is two order lower than that of sodium carbonate solution/crude oil and IFT reaches 10-3 mN/m,the ability of resistance calcium and magnesium ions is about 500mg/L.The emulsification of active alkali and the crude oil is strong.Four kinds of polymer and the alkali have tested for the compatibility in alkali-polymer combination flooding system.The polymer HTPW-111 is better matched with alkali and salt-resisting.Active alkali-polymer combination flooding system with produced water still keeps the property of increasing viscosity action and reducing oil/water interfacial tension of polymer flooding.