SYSTEM WITH A FIXATING RING FOR USE IN HYDRAULIC FORMATION FRACTURING OPERATIONS Russian patent published in 2021 - IPC E21B34/14 

FIELD: engineering elements.

SUBSTANCE: slide valve for opening one or several holes for a liquid in a pipe column, characterised by the presence of a body of the valve and a sliding coupling in the longitudinal channel thereof. The body of the valve is characterised by the presence of one or several holes for a liquid in a part thereof located higher in the shaft of the borehole. The sliding coupling is configured to move in the body of the valve between the closed position located higher in the wellbore, wherein one or several holes for a liquid are closed, and the open position located lower in the wellbore, wherein the holes are open. The sliding coupling is characterised by the presence of a longitudinal channel for placing a collet, and/or a locking ring, and/or a protective coupling. The locking ring forms a thrust shoulder to prevent movement of the collet down the wellbore relative to the sliding coupling.

EFFECT: protective coupling prevents cement or debris from entering the annular section between the channel of the body of the valve and the sliding coupling, thus providing freedom of movement of the sliding coupling for opening said holes for a liquid.

30 cl, 63 dwg, 1 tbl