COUPLING FOR MULTISTAGE CEMENTING WITH CUP TOOL Russian patent published in 2024 - IPC E21B33/16 E21B43/12 

FIELD: mining.

SUBSTANCE: group of inventions relates to well cementing. Well cementing system comprises a coupling for multistage cementing and a cup tool configured for detachable engagement with the coupling for multistage cementing. Coupling for multistage cementing has a main part of the coupling, a locking element connected to the main part of the coupling, and a port shut-off sleeve for selectively closing ports extending laterally through the main part of the coupling. Cup tool has a cup tool main part; inner passage in fluid communication with cup tool ports; collet element located above the cup tool main part for engagement with the port locking bushing; collar swabs intended for engagement with inner surface of coupling for multistage cementing, and removable seat for receiving cleaning cementing plug and holding the cleaning cement plug in the position of blocking the flow through the cup tool ports. At that, the cup tool is made with possibility of selective displacement for movement of the shut-off bushing of the port between positions with blocking of flow through ports of the coupling and with passing of flow through ports of the coupling for cementing operation.

EFFECT: easier cementing operation in a borehole, less number of passes deep into the well.

20 cl, 14 dwg