INTEGRATED LAYERED  WATER INJECTION STRING  FOR MEASUREMENT  AND ADJUSTMENT OF  BACKWASHING WELL

The adjustable water nozzle is built into the underground water distributor. After the test instrument is connected with the water distributor, the flow test and allocation are carried out by measuring and adjusting at the same time. Monitor the flow pressure curve through the ground instrument, adjust the water nozzle size of the water injection valve according to the real-time monitored flow curve until the injection distribution flow is reached, and complete the testing and allocation of all layers at one time. During reverse circulation well washing, the oil casing annulus is pressurized and the anti-creep closed self-locking packer is unsealed. Part of the well washing fluid enters the screen and casing annulus through the oil casing annulus for cleaning, and part of the annulus between the water injection string  and the sand control string is cleaned. Finally, the well washing fluid enters the central pipe through the well washing valve and returns to the ground.