Laboratory Research On Advanced Water Injection Technology Of Low Permeability Reservoir In Liaohe Oilfield

Advanced water injection is an important mining technology,low permeability reservoirs is effective to improve the low permeability reservoir recovery and important method.Let the injection Wells before betting in production operation,makes when brought in its drainage area oil saturation at least not less than the original oil saturation,formation pressure is higher than the original formation pressure so as to establish effective displacement system,can maintain the stability of the formation pressure,can guarantee high and stable yield for a long time,so as to shorten the mining period.Therefore,advanced water injection technology research to improve the development effect of low permeability reservoirs is meaningful.Start the 2-5-11 blocks based on liaohe oilfield Du Gutai reservoir were studied the advanced water injection for low permeable oil fields of indoor.Advanced water injection in low permeability reservoir similarity criterion research 26 similarity criterion,of which?10,?3,?8,?5 as the main similarity criterion,the irreducible water saturation,mobile oil saturation and water phase permeability,well relative position,caliper and reservoir thickness affect indoor affect oil recovery in low permeability reservoir water flooding experiment in advance of the key technical parameters.On the basis of similarity principle and produced a physical model,the model size is 30 cm * 30 cm * 4.5 cm,vertical Wells using the nine point well pattern to big flat model displacement experiment.At the same time to determination of parameters in the long core advanced water injection experiment,and tests this with the slab model.The experimental results show that the Du Gutai reservoir reasonable formation pressure level,120% in the early production strength of 0.356 t/d,m;The critical injection rate of 2.4-4.19 m/d;Because indoor experiment injection-production balance,injection-production ratio of 1:1,translation should be carried out in accordance with the field injection-production ratio to determine the site of injection water compared with synchronous water injection,under the reasonable pressure level,advanced water flooding produced fluid volume is high,the early water breakthrough early,but has certain inhibitory effect on water cut rising velocity;Early production,the pressure is on the rise near wellbore area of injection well,rising gradually slow speed,the pressure is on the decline,the middle and down speed increasing,the early production well pressure near wellbore area declines,with the increase of extraction time,constant pressure tends to think that the lower the reservoir permeability is more suitable for water flooding development mode in advance,the need to maintain the formation pressure level is higher,the development effect is more obvious.Through the advanced water injection and indoor experiment study can has strong guiding significance on the spot,aims to better development of low permeable oil fields.