Research On The Identification Of Low-efficiency And Invalid Injected Water Circulation Belts In Ultra-high Water Cut Stage

Due to long period of flooding,there is great change to the reservoir properties of Sabei oilfields,and low efficiency water circulation band is formed。Due to the low efficiency circulation of a large quantity of water along this band,it is difilcult to further improve the swept volume of oil beds,so,the water injection volume for each ton of oil is Featly increased。Quickly and accurately identify low effective circulation well layer is the key to the problem。The article analyses and studies the inefficient invalid circulation channel formation mechanism and characteristics。According to the low effective circulation well selected layer, summarizes invalid and low effective circulation of several types in the oilfield high water-cut stag。Under the thinking of"dynamic broad survey,static determination and testing demonstration", According to the high precision injection profile test data identify layer and direction,the analytical discrimination method for low efficiency water circulation band is formed.With the application of this method,the typical block is surveyed and treated。The relative measures for different low efficiency water circulation bands are proposed to control the production decline of iloOding,slow down the water cut increasing rate and increase IOR of flooding。The results are significant.