Water Flooding Production Technological Limits And Development Effect In Classⅱ Reservoir In Eastern Block Of Beierxi

Eastern block of beierxi is at the later stage of high water-cut, having the water-cut up to 85%. Rising of water-cut makes the development of oilfield more and more difficult. At the later stage of water flooding, various problems influencing development effect are especially obvious, in order to make reservoir development in the best conditions, some reservoir engineering methods have been selected to analyze the production features at the later stage of water-injection. Evaluating the water flooding development effect scientifically is of great importance to deepen the water flooding and offer reliable reference of carrying out the measures of exploring the potential reserves as well as increase the oil recovery.Based on the actual production performance data of eastern block of beierxi, this paper determines the water flooding law curve and the production decline law of the block through statistical regression, and establishes prediction equation of water-cut and oil production. With the principle of hierarchy analysis, the methods of fuzzy comprehensive and oil reservoir engineering, the development effect of the block is evaluated. Through the logistic cyclothem, the equation of water injection and oil production is established. The reasonable injection production rate under the conditions of different water-cut and the curve of water injection rate and oil production are obtained. By establishing the equation of injection production rate, liquid production and total pressure difference, the reasonable formation pressure recently is obtained. Researching the adjusting boundaries of the technological limits has most guiding significance for the adjustment of the exploitation plan, which provide reliable basis for designing adjusting plan of reservoir exploitation.