METHOD FOR DISCONNECTING TUBING STRING AT PACKER POLISHED RECEIVING SOCKET AND DOWNHOLE ASSEMBLY FOR SEPARATING THE WELL BORE INTO TUBING STRING SECTIONS Russian patent published in 2023 - IPC E21B23/10 E21B17/06 

FIELD: oil and gas.

SUBSTANCE: group of inventions relates to a method for detaching a tubing string at the place of a polished packer receiving socket and a downhole assembly for dividing a wellbore into sections of a tubing string. The method includes placing a polished packer socket inside the wellbore. The polished packer socket has a first tubing string section, a second tubing string section, and a latch system for disconnecting the tubing string connecting the first tubing string section and the second tubing string section. The method also includes injecting fluid into a control line connected to a piston configured to move from a non-expanded position to an expanded position, and sending an electrical signal through an electrical control line connected to a piston configured to move from a non-expanded position to an expanded position. The method also includes expanding the piston from a non-expanded position to an expanded position within a polished packer socket by one of fluid pressures and an electrical actuator connected to the piston. The piston is connected to an atmospheric pressure chamber located in the polished packer socket. The method also includes cutting a set of pins connecting the collet to one of the first section of the tubing string and the second section of the tubing string. The method also includes disconnecting the latch system for disconnecting the tubing string. The method also includes separating the first section of the tubing string from the second section of the tubing string.

EFFECT: simplified design, management and operation, as well as increased fault tolerance.

14 cl, 6 dwg