INSTALLATION METHOD OF CEMENT BRIDGE IN WELL UNDER INTAKE FORMATION Russian patent published in 2014 - IPC E21B33/16 

FIELD: oil and gas industry.

SUBSTANCE: installation method of a cement bridge in a well under an intake formation involves lowering to the well of tubing string with a coupling containing two rows of radial holes. In initial position radial holes of the coupling are tightly covered from inside with a sleeve with a mounting seat. The outer side of the sleeve is provided with an annular groove and radial holes. The sleeve is fixed with a shear element and has the possibility of being moved downwards till stop. Then, subsequent pumping of cement grouting and displacement liquid to the tubing string is performed through a displacement plug with a fixing head to tube and annular spaces. The head is fixed in the mounting seat under action of displacement pressure. After that, the shear element is destructed and the sleeve together with the displacement plug moves downwards so that upper and lower holes open. Then, the tubing string with a lower end face is a little lifted and the lower end face is installed above deformation interval.

EFFECT: invention allows improving installation efficiency of a cement bridge in a well owing to excluding dilution of cement grouting with displacement and well liquid, as well as simplifying the method due to absence of back-flushing after full removal of cement grouting from the tubing string.

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