FIELD: oil and gas production.
SUBSTANCE: proposed device comprises casing and jacket jointed therewith. Jacket with casing having opening at its top makes closed chamber to house circular piston to produce high-and low-pressure chambers. Spring is fitted inside low-pressure chamber. Compacted metal chips are fitted inside high-pressure chamber. Proposed device is mounted in drilling string by thread joints. High-pressure chamber is communicated via channels with string inside.
EFFECT: expanded performances, smaller sizes, higher efficiency.
1 dwg
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