The Study On The Resonable Parameters And Application Form After Rounds Of Cyclic Waterflooding

Cyclic waterflooding is one of the effective means to improve the development result of oilfield in the stage of high water cut. It has the charecterictic that invests slightly, effects fast and goes easily. It can slow down the rate of water cut increasing to a certain degree, improve the ultimate recovery of water flooding. This paper aims the research at the Chaoyanggou low permeability fractured reservoir,elaborates the mechanism of improving development effect of cyclic waterflooding. The development effect of cyclic waterflooding in strip-apparent sand, lenticular sand, flakiness break up sand,border river channel sand and some other kinds of sand and the model of longitudinal heterogeneous is researched by the method of mathematical simulation.When the strip-apparent sand skews intersection with well line, the influence of matrix, fracture permeability, well pattern, injection style, water injection intensity and the model of permeability transition of the sand make on the effect of cyclic waterflooding.is researched As for lenticular sand, the influence of sand position, matrix permeability, well pattern, injection timing and injection style make on the effect of cyclic waterflooding.is researched As for flakiness break up sand, the influence of matrix permeability, well pattern, different part of sand and injection style make on the effect of cyclic waterflooding.is researched As for straight strip-apparent sand, the influence of developmentdirection of sand, sand position, matrix permeability, well pattern, injection timing and injection style make on the effect of cyclic waterflooding.is researched. As for the model of longitudinal heterogeneous, the influence of injection timing and injection style make on the effect of cyclic waterflooding.is researched.Study shows that the effect of cyclic waterflooding is the best when the strip-apparent sand skews intersection with well line. The effect of cyclic waterflooding in inverted nine-spot pattern is better than line pattern. The overall interval flooding is the best in the styles of cyclic waterflooding. When the injection intensity of cyclic waterflooding is 2 times than the injection intensity of conventional waterflooding, the better effect of cyclic waterflooding is obtained. The effect of cyclic waterflooding when permealibity is gradually change is better than when the permeability is suddenly change.