PROCEDURE FOR SEALING HEAD WITH SPLIT STRING Russian patent published in 2011 - IPC E21B33/04 

FIELD: gas and oil production.

SUBSTANCE: in cylinder boring of press-on reel there is installed packing unit consisting of support ring, of self-packing rubber collar in form of non-split ring, of press-on ring with internal conic surface, of split ring with external conic surface conjugated with internal profile of press-on ring, of pinch ring and of bearing sleeve. Flange connection of the press-on reel and split flange are pulled together due to interaction of conic surfaces of the press-on ring and split ring. The split ring is deformed till elimination of process gap between its internal surface and surface of a casing.

EFFECT: reliable head sealing with string due to elimination of extrusion and destruction of sealing element from sealing unit under pressure of well fluid.

7 dwg