ASSEMBLY FOR EXPANSION OF A DRILLING SYSTEM SHAFT Russian patent published in 2023 - IPC E21D1/06 

FIELD: drilling system.

SUBSTANCE: group of inventions relates to a shaft expansion assembly for a drilling system, and a drilling system comprising said shaft expansion assembly with a hollow column located near the lower end of the drilling system. The assembly for expanding the shaft contains a hollow column located near the lower end of the drilling system, and the hollow column contains an upper section, a middle section, a lower section and a telescopic part, which is axially movable relative to the rest of the hollow column; an expander section comprising the first cutting head assembly tapering downwardly that is mounted on a hollow column with a possibility of rotation, with the first drive means configured to rotate the first cutting head assembly relative to the hollow column so as to drill down a hole having a diameter corresponding to that of the first cutting head assembly; a drill head assembly coupled to a working lower end of the telescopic portion of the hollow string, the drill head assembly ending in a downwardly tapering second cutting head assembly to drill a guide or pilot hole; an axial movement section configured to advance the drill head assembly relative to the expansion section; spreader assembly. A drilling system is also claimed, which contains the specified assembly for expanding the shaft and contains a plurality of auxiliary platforms located above the assembly for expanding the shaft inside the hole drilled by the first assembly of the cutting head, and the assembly for expanding the shaft is made with the possibility of separation from the plurality of auxiliary platforms.

EFFECT: assembly for expanding the drilling shaft.

20 cl, 32 dwg