FIELD: oil production, particularly devices for sucking rod centering and paraffin deposits removal from tubing string walls.
SUBSTANCE: device comprises cylindrical bush with two blades made as double spiral. Upper and lower ends of each blade are spaced 180° one relatively another. Flats are made in blade and cylindrical bush end surfaces. Channel defined by two blades smoothly envelopes cylindrical bush.
EFFECT: decreased flow string and sucker rod wear, increased efficiency of paraffin removal, decreased loads applied to sucker rod and flow string, increased reliability of bottomhole equipment operation and extended overhaul life.
2 dwg
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