REUSABLE ANCHOR DEVICE (THREE VERSIONS) Russian patent published in 2015 - IPC E21B23/00 

FIELD: mining.

SUBSTANCE: group of inventions is intended for the mechanical fixation of a whipstock in a well with a thrust against a cement bridge or a packer without the use of a working fluid, its fixation in a well without the well space separation, using for anchoring a working fluid supplied along a flow string, and also additionally to the fixation of the device in the well for the well space separation when drilling new shafts from one or several operating strings. A reusable anchor device comprises an adapter with a channel of fluid supply, a die stock with dies fixed on the adapter by a nut, one of which is installed as capable of movement along the inclined surface of the die stock. The device comprises a stem, at one end of which there is a connecting thread for connection with the adapter. Coaxially on the stem there is a pusher installed as capable of longitudinal displacement, on the surface of which there are two longitudinal through slots, via which the other dies installed in them are fixed on the die stock. One die is made with teeth thrusting down and is connected to the die stock by one shear screw. On the cylindrical surface of the adapter there are splints, complementary with splint grooves on the inner cylindrical surface of the die stock. Other dies are made with teeth thrusting up and are fixed on the die stock. The device comprises a thrust bushing connected to the stem, a tip fixed on the cylinder, inside of which there is a collet and a shear bushing. The shear bushing is connected to the stem by a shear pin. The die stock is fixed on the adapter by a nut. Plate springs are installed between end surfaces of the adapter and the die stock.

EFFECT: increased reliability of the device operation.

3 cl, 9 dwg