Optimization Design Of Profile Control And Water Shutoff

There are two limitations in profile control and water shutoff.One is the limitation of amount of plugging agents and the other is the limitation of the role of plugging agents. We usually think that the potentiality of profile control and water shutoff will decrease with passage of development time, but the tests of oilfields show that profile control and water shutoff have still quite a lot of potentiality. This is not only because recovery percent of reserves in the pilots is low,but also because the techniques of profile control water shutoff in whole block have a new breakthrough in decision making technique and plugging agent technique. According to the whole technological process of chemical profile control,considering the production status of injected wells and on the basis of its performance data and static data,it gives a simple and viable and optimal profile control decision-making technique on the paper. With the theory of the reservoir engineering and fuzzy mathematics knowledge and on the basis of performance data and static data of injected wells and oil wells, conclusions can be drawn. It establishes the principle of well selection decision-making of chemical profile control. On the basis of well selection decision-making,it establishes the principle of formation selection decision-making with fuzzy composite adjudication technique and establishes the database of the common profile control agents. According to the formation condition,it can select the optimal profile control agent with the computer technique;it adopts various methods to calculate the dosage of the profile control.It can select the optimal method,and determine the injection pressure and discharge capacity of the profile control agent. On the basis of static state geology research and water flooding performance research of oil reservoir engineering technique,and full research heterogeneity of formation,water absorbing capacity and production performance of oil wells,the software system of profile control and water plugging is developed. The software can realize formation evaluation and well choosing of profile control and water plugging,job design,effictiveness forecastion and effect evaluation. It can supply scientific basis for project design.