METHOD FOR BOTTOMHOLE ZONE TREATMENT Russian patent published in 2014 - IPC E21B37/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry, in particular, to treatment methods of bottomhole zone of the formation. The method includes running of flow string with packer and blade at the end to the well, the well is separated over the perforated interval of productive formation by the packer, connection of below-packer space by the flow string to well-head of the well. Before treatment of the bottomhole zone radial openings are made in lower part of the blade, below the openings a limiter is installed. Openings in initial position are sealed hermetically by a hollow sleeve capable of axial movements till it stops at the blade limiter and fixture. At the wellhead the arrangement is made consisting of the blade spring-controlled by protrusion of the flow string and the packer. The blade can move along the axis. The arrangement is run until it stops at the blade limiter into sump contamination and change in weight of flow string hanger. Circulation liquid is pumped until weight of the flow string hanger recovers; a ball is thrown to the flow string, then excessive pressure is created at the flow string and under this pressure the hollow sleeve moved down until it stops at the blade limiter. Flow string is run so that radial openings are opposite formation top, then washing of perforated intervals is done by axial movements of the flow string from the formation top till bottom with speed of 0.15 m/min; the packer is seated and treatment of the formation is made by acid.

EFFECT: raised efficiency and quality of cleaning, expanded process functionality.

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