RESEARCH ON QUANTITATIVE EVALUATION METHOD OF REASONABLE OIL RECOVERY RATE IN OILAND GAS FIELD DEVELOPMENT

摘要

At present, most oil and gas fields in China have entered a period of slow reserves growth. The growth of oil and gas production capacity mainly depends on scientific management of oil and gas development. Oilfield high-speed development should determine the largest and more reasonable oil recovery rate according to different oil fields and different development stages. In this paper, a systematic study is conducted on the rational oil recovery rate during the development and management of Kunbei Oilfield. The analysis results show that the conventional decreasing method and numerical simulation method have some shortcomings in calculating the reasonable oil recovery rate. Therefore, this paper adopts a method of superimposing yield prediction based on numerical simulation. Through model comparison, it was finally determined that the combined solution method of type A water flooding curve and generalized Wong's model was used to calculate the reasonable oil recovery rate. The average relative error of this method was 3.77%. New and old wells or different formations have different reservoir properties and oil recovery rates, and their declining laws are different. At this time, the "overall prediction" technology can be considered. That is, the wells deployed in different strata and different areas of remaining oil origin are classified into one scheme representative well for overall prediction. The "overall prediction" is the comprehensive average of multiple types of wells and multilayer systems. This result can be used in the estimation of future production targets.