Application Of Zonal Water Injection And Development Result Of Waterflooding In Qinjiatun Oilfield

Qinjiatun oilfield is located in the south of Songliao Basin, in the eastern slope zone tenhouse broken, as the North East to large nose structure belt, fold area of nearly100squarekilometers, by many faults, forming a plurality of fault block trap, structural high short-axisanticline traps for independent. Reservoir developed in the upper Cretaceous QuantouFormation, lower Cretaceous Denglouku formation, complex small fault block reservoirs.After10years of development, reservoir plane heterogeneity is strong, the effect is not wellbalanced; interlayer heterogeneity, injection-production ratio is low, the interlayer waterflooding control, use the uneven degree; reservoir in different direction of the differences,conflicts between layers, layer contradiction is very outstanding, in the injection process themonolayer breakthrough and fingering phenomenon is very obvious, resulting in uneveninjection advance; oilfield water injection well is less, injection rate, layer of low qualificationrate, water injection effectiveness remains to be further improved. Waterflooding Qinjiatunoilfield has been in high water cut stage, water diversion, potential is the major work, is alsothe route one must take the oilfield development, in view of this situation, it is necessary toimplement the layered water injection, improving water status, improving water floodingcontrol, producing degree of reservoir, reservoir should supplement the energy, enhance oilrecovery, to improve the development effect, oil production has important significance.In this paper, in order to solve these problems, effectively improve the water injectionprofile, the stable oil production, the layered water injection measures in Qinjiatun oilfield,the results show that, the reservoir water injectivity profile is improved obviously, water ingood condition, water flooding control, producing degree have improved, effectivelyimproved the water absorption difference profile also note that, the corresponding oilreservoir has been fully energy supplement, corresponds well to different extent effective, oilrecovery rate increases, the natural decline year-on-year decline, greatly improved thedevelopment effect of the oil field, to achieve the purpose of stable, has the vital significance.