FIELD: oil and gas industry.
SUBSTANCE: group of inventions relates to cleaning system for element located in well casing string. Well system consists of well fluid under pressure, casing string, cleaning tool having a longitudinal direction and including rotary head with multiple nozzles, housing with inlet communicated with nozzles for passage of borehole fluid into said tool, a flow hindering element arranged on an outside of the housing, which separates tool to first and second parts, as well as separating casing string to first and second parts, and rotary shaft connecting head. System further includes a pump, which increases pressure of well fluid medium in first part of casing string to significantly exceeding downhole pressure, as well as higher than pressure in second part of casing string so that well fluid is pumped through inlet hole and discharged through nozzle. Tool includes a control device to control speed of rotation of head.
EFFECT: simpler and easier well-immersed structure of cleaning system.
20 cl, 4 dwg
