HYDROGEN SULPHIDE RESISTANT SLIPS PACKER Russian patent published in 2024 - IPC E21B33/129 E21B41/02 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and is intended for tight separation of intervals of the casing string when performing technological operations in the process of repair and operation of production and injection wells. Hydrogen sulphide-resistant slips packer includes a hollow rod, on the lower end of which there is a support, on the hollow rod with resting on the support there are successively installed lower slips, lower cone, collar, upper cone, upper slips, stop, which are pressed from above by retainer in form of split nut installed on hollow rod by means of threaded connection, wherein bushing is screwed into top part of stop to interact with setting tool to actuate packer and to transfer forces to retainer and top slips. Hollow rod, support, upper and lower slips, upper and lower cones, stop, sleeve are made of easily drilled hydrogen sulphide-resistant materials, collar is made of rubber material resistant to hydrogen sulphide medium. Cavity of the hollow rod of the packer is filled with a liquid which absorbs hydrogen sulphide, and a system of its displacement into the well space in the form of a piston spring-loaded in the lower part of the cavity of the hollow rod of the packer. From above, the cavity of the hollow rod of the packer is tightly closed with a bursting pin made with the possibility of interaction with the setting tool. Bursting pin has a neck and a blind hole passing from its lower end and providing a hydrodynamic connection between the cavity of the hollow rod of the packer and the well space in case of rupture of the neck of the bursting pin during installation of the packer.

EFFECT: expansion of conditions for use of the slips packer, improvement of efficiency and provision of reliability of operation on tight isolation of wellbore intervals under conditions complicated by hydrogen sulphide release from the formation into the well space.

1 cl, 1 dwg