NON-REMOVABLE HYDRAULIC ANCHOR Russian patent published in 2021 - IPC E21B29/06 E21B23/04 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of drilling oil and gas wells, in particular to devices for sidetracking and drilling of sidetracks from cased wells. The anchor is made in the form of a shaped pipe, has a hydraulic channel for communication with the in-pipe space of the drill pipes by means of a hydraulic line. In the upper part of the armature, a hinged connection with a whipstock is made, the lower end has a shoe. A spring-loaded differential valve is installed in the anchor shoe, made with the possibility of bypassing the well fluid through the central communication channel between the in-pipe and annular space in the event of excessive annular or in-pipe pressure. The central communication channel includes an annular and an internal cavity. An annular cavity is formed between the outer surface of the differential valve and the inner surface of the armature shoe. The inner cavity of the central communication channel is at the same time the inner cavity of the differential valve; a ball with "zero buoyancy" is freely installed in it.

EFFECT: increase in the reliability of the anchoring device and improves the efficiency of sidetracking.

2 cl, 4 dwg