UNCOUPLER FOR SEALING THE WELLBORE OF THE CASING STRING Russian patent published in 2022 - IPC E21B33/12 

FIELD: oil industry.

SUBSTANCE: invention relates to devices for use in the oil industry and, in particular, is intended for sealing the wellbore casing between a submersible pump and equipment for separating the produced fluid from mechanical impurities. The uncoupler includes a housing and an adapter forming a hollow composite rod with upper and lower threaded ends, a sealing unit mounted on the rod and equipped with an upper centralizer. The sealing assembly is made in the form of a ring, on the generatrix of which, in rectangular grooves, petal sealing elements are overlapped, which can be rotated around a horizontal axis in a vertical plane, and the position of the petal sealing elements is regulated by pushers that are in constant contact with them and located in the body of the hollow rod. The lower part of the petal sealing elements of the sealing unit is made with the possibility of releasing them from the inner generatrix of the spring-loaded cup and pushing the petal sealing elements to the casing string by pushers due to the softening of the solid material in the oil medium in the adapter holes and moving the cylindrical bushings in them together with the spring-loaded cup to the side adapter.

EFFECT: significant increase in the reliability of the uncoupler, expanding its functionality, as well as in the convenience of its maintenance.

1 cl, 3 dwg