SHOE-VALVE FOR INSTALLATION OF EXPANDABLE SYSTEM IN WELL Russian patent published in 2020 - IPC E21B29/10 E21B34/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely to drilling of wells, in particular to devices for installation of expandable systems in isolation of zones of complications during drilling. Proposed device comprises housing with central pass channel made with external thread to be connected with expandable pipes, valve, seat and sleeve. Body has an internal thread located in the upper part of the central pass channel. Valve is made in the form of a quadrangular prism with a spherical surface interacting with the seat. Said seat is made integral with housing. Sleeve is screwed in internal thread of housing to limit valve stroke and has grooves. Number and width of the bush slots correspond to the number and width of the cutter blades providing for the flapping of the shoe-valve made of easily drilled polymer.

EFFECT: simplified design, increased reliability of operation with provision of disconnection and lifting of shoe-valve or drilling out immediately after flaring of extensible system in one lowering-lifting operation with minimum time costs, and also reduction of emergency situations in well.

1 cl, 5 dwg