FIELD: petroleum industry.
SUBSTANCE: group of inventions relates to the petroleum and gas industry, in particular, to methods for cleaning the casing string of a borehole. Apparatus includes an internal ring containing at least one delivery outlet, an external ring containing at least one jet hole in fluid communication with at least one delivery outlet. The internal ring is linked with the external section of the tool descent string. The external ring is configured to rotate around the internal ring in response to the flow of fluid through the tool descent string. The internal ring comprises a runner sleeve configured to move from a first position to a second position to force at least one jet into fluid communication with at least one delivery outlet in response to the flow of fluid through the tool descent string.
EFFECT: controlled reliable cleaning of the shank eliminating the rotation of the descent tool and the descent and ascent thereof.
15 cl, 11 dwg
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