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通过注入水水质分析和控制含铁、含氧量进行的模拟地层水岩心流动驱替实验,认为注水造成储层堵塞的真正原因是注入水含铁含氧量偏高。即使少量的铁氧化合物,因低渗储层孔喉细小,其造成的堵塞也非常明显,在避免水敏的情况下,驱替120PV时伤害率达37·0%,而常规刚性颗粒堵塞,驱替180PV仅3·4%。所以,该低渗油藏注水开发,不但要防膨和控制注入水的颗粒粒径和颗粒浓度,尤为重要的是控制注入水的含铁、含氧量。
By injecting into the water quality analysis and control of iron, oxygen content of the simulation of formation water core flow displacement experiments, that the real reason for water plugging reservoir plugging is due to the high oxygen content of iron in water. Even a small amount of ferrite, due to the small pore throat of the low-permeability reservoir, caused significant blockage. When water-sensitive was avoided, the injury rate was 120.3% and the conventional rigid particles were blocked, Drive 180PV only 3.4%. Therefore, the development of low permeability reservoirs should not only prevent swelling and control the particle size and particle concentration of injected water, but also control the iron content and oxygen content of injected water.