Core of water injection mandrel

A water distributor core using for an oil field water injection technology comprises an upper contact, an upper caky cap, an upper sealing sleeve, an upper spacer ring, a main body, a water distribution nozzle, a lower spacer ring, a lower sealing sleeve, a lower caky cap and a lower contact. The upper spacer ring and the upper sealing sleeve are sleeved on an upper part of the main body, the upper contact and the upper caky cap are coupled with a screw thread on the upper part of the main body, the lower spacer ring and the lower sealing sleeve are sleeved on a lower part of the main body, the lower caky cap and the lower contact are coupled with the screw thread on the lower part of the main body and the water distribution nozzle is arranged in the middle of the main body. External diameters at two ends of the upper sealing sleeve and the lower sealing sleeve are small and the small diameter parts are sleeved in the upper spacer ring, the lower spacer ring, the upper caky cap and the lower caky cap. The upper sealing sleeve and the lower sealing sleeve cannot be loosened from the main body, the sealing is reliable, the well is injected as per water rationing, no reworking can be caused due to the unsuccessful fishing of the water distributor core caused by the clamping of the sealing ring in the water distributor core, the working cost can be reduced and water injection time can be prolonged.