Development and Application of Subdivision Water Injection Technology in Gudong Oil Production Plant

The conventional eccentric water injection string is generally used in multi-stage separate injection wells, and the equal pressure drop test method is adopted, and the water volume calculation method is adopted, and the average test period of a single well is 8 days. With the concept of reliability design, the working reliability of separate injection string was strengthened, and the measures of separate injection, subdivision injection, interval recombination and pipe inspection and redistribution were implemented on site. The average number of separate injection layers per single well in sandstone reservoir increased from 2.9 to 3.5, and the average number of separate injection layers per single well in main sandstone reservoir increased steadily from 3.0 to 3.8. At the same time, the linkage technology of bridge eccentric separate injection and measurement and adjustment is gradually popularized, and the average test period of single well is shortened from 8 days to 2 days.