HOISTING TOOL AND METHOD FOR EXTRACTING A DOWNHOLE TOOL Russian patent published in 2022 - IPC E21B31/20 

FIELD: petroleum industry.

SUBSTANCE: group of inventions relates to the petroleum and gas industry and can be used in extracting tools from boreholes. Apparatus comprises a latch assembly including a body with an engagement end, defining a central hole; a latch element connected with the body and configured to move between a radially extended state and a radially retracted state; a lifting shaft connected with the latch assembly and containing an outer body and a front assembly configured to slide inside the outer body. The front assembly comprises a rod section passing into the central hole of the body of the latch assembly. The front section is immediately adjacent to one end of the rod section, and the engagement section is immediately adjacent to the opposite end of the rod section and is engaged with the engagement end of the body of the latch assembly. The front assembly and the outer body form an activation chamber. An activation tool is located inside the activation chamber and is configured to move the front assembly from the first descent configuration to the second extraction configuration.

EFFECT: operation of tool extraction is facilitated, integrity and strength of the hoisting tool are ensured.

13 cl, 8 dwg