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油田由于长期注水开发,储层的渗透能力明显增强,个别储层已形成了大孔道.识别、治理大孔道是油田进入高含水开发阶段主要工作之一.利用压降法分别计算注水井各个时期的储层渗透率,分析其变化趋势,结合历届关井初期地层压降速度和幅度可以判断注水井大孔道.当储层有效渗透率明显增大,关井初期前5 min内降落幅度是全井降落幅度50%以上,且压力导数双对数曲线中期出现凹型时,注水井存在大孔道.对于存在大孔道的注水井,同位素曲线和流量曲线皆显示的主要吸水层就是大孔道层位;同位素曲线显示不吸水,而流量曲线和井温曲线皆显示的主要吸水层也是大孔道层位,需要对这些层位采取调剖措施.该方法为油田下一步措施、实现储层精细注水提供了依据.
Due to the long-term waterflood development, the infiltration capacity of reservoirs has been obviously enhanced, and some reservoirs have formed large channels. Identification and treatment of large channels are one of the major tasks in oilfields entering the high-water-cut development stage. By using pressure drop method, , The trend of reservoir permeability is analyzed and the large well of water injection well can be judged according to the velocity and amplitude of formation pressure drop in the early stage of shut-in.When the effective permeability of reservoir increases obviously, Wells with a drop of more than 50%, and the double-logarithmic curve of pressure derivatives has a large pore when there is a concave in the middle of the logarithm of the pressure derivative.For water injection wells with large pores, both the isotope curve and the flow curve show that the major water layer is the macropore layer; The isotope curve shows that there is no water absorption, while the flow and temperature curves show that the major water-absorbing layer is also a macropore layer, and profile control measures need to be taken for these layers. This method provides the next step for the oilfield to realize the fine waterflooding of the reservoir in accordance with.