DEVICE AND METHOD FOR SELECTIVE INJECTION OF MATERIALS INTO WELL Russian patent published in 2023 - IPC E21B34/14 E21B43/12 E21B43/16 

FIELD: oil and gas production.

SUBSTANCE: device for selective injection of materials into the well contains an elongated inner housing having the first group of channels passing through it, selectively closed by means of the first sleeve. The second group of channels extends through the inner body and is selectively closed by means of the second sleeve. The outer body extends between the first and second ends and surrounds the inner body to form an annular cavity between them. The first end of the outer housing is tightly connected to the inner housing. The second end of the outer casing has a free edge opposite the second group of channels. The first group of channels passes through the specified inner housing into the specified annular cavity in such a way that the fluid passing through the specified first or second group of channels exits the specified device at the same place. The first and the second sleeves are located in the central channel with the possibility of free action on them with a pusher key. A method for selective injection of materials into a well is claimed.

EFFECT: cementing and completion of the well using the same location of the hole, which ensures prevention of blockage by cement or other blockages of the nozzle channels.

19 cl, 7 dwg