Study On Productions And Their Influences In Complicated Small Fault-block Reservoirs In Jiangsu Oilfield

Large amounts of data had been collected in 188 developed units of Jiangsu Oilfeild,including geological reserve abundance,fluidity,unit reserve factor,irreducible water saturation,residual oil satruration,productivity index per-meter,absolute permeability,formation crude oil viscosity,single reservoir pressure drop and dynamic history development data.Each unit had been defined through analyses of years of stable production,average annual oil production and decreasing rate of steady decline,and classified in accordance with a variety of standards.It was the first time that using the entropy in parameter weights calculation during different developed units.Through quantitative calculation,the developed units could be divided into?,?,?categories,taking dimensionless comprehensive entropy value 0.16 and 0.1 as the demarcation points respectively.Selecting 782 wells with relatively stable oil-producing,the research had been carried on basic characteristics of production change from single well to each unit with different reservoir types.Production change models have been made in different categories under different standards.Fractal theory was first used in research of production characteristics in Jiangsu Oilfield.Through the calculation of fractal dimension of monthly production change and Hust index,and the production change persistence judged by fractal dimensions,it would help the production prediction as long as the fractal dimension was 0.8.The research had been carried on the influence factors of the production change by gray relevancy analysis,T test analysis,correlation coefficient test,etc.For the decline rate,unit production plateau production speed,producing reserves scale,single storage coefficient and fluidity have the remarkable correlation.For production plateau production speed index,the productivity index per meter,mobility,and geological reserve abundance have significant correlation.Analyses on production change were taken in seven typical units,such as W2,C2,G6,Z43 and so on.The key influencing factors were found and the next diminishing control methods were suggested.