MACHINE FOR PARAFFIN REMOVAL FROM OILFIELD CASING AND TUBING GOODS Russian patent published in 2010 - IPC E21B37/02 

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil industry, particularly to machines for paraffin removal from an internal surface of tubing string (TS) of oil wells equipped with an electrical submersible pump. The machine accommodates scrapers connected with a lifting and lowering drive and turned 90° around a longitudinal axis, and comprising an attachment assembly frame, studs, two movable spring-assisted blade elements. The scrapers have longitudinal ribs contacting with the internal surface of the cleaned pipes; and they are end-tapered for passing knots and rigidly connected to the blades in the form of pointed annular sectors. The blades between the points have a diametral boring along the length of the sector that forms a contact gap between the internal surfaces of the cleaned pipe and the blades.

EFFECT: higher effectiveness of cleaning of the tubing string, lower power inputs and higher reliability of the machine.

5 dwg