Research on Adjustment of the Injection-Production Structure of Reservoir under Differential Fluid Flow Control

K oilfield has been in extra-high water cut period, and its degree of reserve recovery is 42.3%. In order to further improve the effect of water flooding development, in this paper, by establishing a streamline model based on the complex function, drawing a streamline diagram, and counting the number of streamlines per unit area, the dominant channels in the K oilfield are divided into three grades based on the cumulative frequency distribution of 25% and 75%, including 10 main dominant channels, 14 sub-dominant channels, and 7 non-dominant channels. Differential control of fluid production and water injection is carried out for different levels of dominant channels. Through the adjustment of oil well fluid production and water injection well water injection, the streamlines of the oilfield are redistributed. The practice of K Oilfield proves that 8 wells increase the liquid production rate by 40% - 107%; 1 well reduces the liquid production rate by 34%; 3 wells increase the water injection rate by 17% - 19%; 2 wells reduced the water injection rate by 12% - 32%; the average daily oil production of the oilfield increased by 40 m3/d, and the average water cut decreased by 0.7%.