SPIRAL ALIGNMENT SLEEVE Russian patent published in 2021 - IPC E21B17/10 E21B17/22 

FIELD: drilling.

SUBSTANCE: group of inventions relates to an apparatus and a method of centering a tubing string relative to a casing in a wellbore. An apparatus for centering a tubing string relative to a casing in a wellbore is comprised of a sleeve containing a groove defined by at least a first and a second edge of the sleeve; at least a part of the first edge defining a left-side spiral part of the groove; at least a part of the second edge defining a right-side spiral part of the groove. The left-side spiral part and the right-side spiral part are located at different axial positions along the sleeve relative to the central axis passing through the sleeve. At least one of the first edge or second edge is comprised of a divider part extending circumferentially around at least a part of the sleeve and separating the left-side spiral part of the groove from the right-side spiral part of the groove.

EFFECT: increased efficiency of centering the tubing string relative to the casing in the wellbore.

10 cl, 13 dwg