Studying On The Technology Adjustment To The Water-Flood Effect For Lamadian Oilfield's High Water-Cut Stage

When the lamadian oilfield is in the high water-cut stage, we found that the oil-fluid ratio, the consuming water volume and the recovery percent of commercial reserves has become high, the water-cut difference between two layers is little, and it is very difficult to improve the recovery potential, as well as the structure adjusting. Regarding to this reality, basis on analyzing the data of the core, as well as the geological section and the numerical model computing, we studied the status of the occupying of every layers and the distribution of remaining oil. We also studied the useless injection and production problem combined with the indoor experiment outcomes.Basis on the material balance method, this paper studied the standard of the reasonable pressure. We also studied the developing potential limits of the old wells by combining the break-even analysis with the reservoir engineering analysis. At last, we fix the technologic policy for water-flood development that in a high water-cut stage. This paper also gives the method of enhancing the recovery potential for a well in high water-cut stage, as well as the method of finding and controlling useless injection and production.