TUBING STRING EXTENSION Russian patent published in 2024 - IPC E21B17/07 

FIELD: oil industry.

SUBSTANCE: invention is intended for downhole oil production using submersible pump installations; it can be used to lengthen a tubing string to ensure reciprocating movement of submersible equipment inside the well. The tubing string extension contains a housing, inside of which a hollow movable rod, a spring and separating elements are coaxially located, and an adapter for connection to the tubing string is installed. An electrical line in the form of a spiral is laid outside along the body. A piston is attached to the hollow movable rod. Inside the piston there is a coaxially located through hole for supplying liquid pumped by the pump. On the outer side of the piston there are at least two guide grooves for limiting screws screwed into the outer side of the housing. In the annular gap between the movable rod and the body, seals are placed to separate the internal cavity of the device and the annulus. The separating elements are installed between the spring and the seals in the specified annular gap. The tubing string extension is designed to be connected to the tubing string in the upper part using an adapter, and in the lower part the tubing string is connected to a hollow movable rod.

EFFECT: elongation of the tubing string and controlled reciprocating movement of submersible equipment inside the well during oil production using submersible pump installations are provided while simplifying the design of the extension.

1 cl, 3 dwg