DEVICE FOR TREATMENT OF WELL WALLS Russian patent published in 2002 - IPC

FIELD: oil and gas producing industry; applicable in cleaning of walls of casing string pipes in repair and restoration work. SUBSTANCE: device has hollow body with connection thread on its ends. Case is concentrically installed to body for axial rotation. Installed on case in spiral line are blades with reinforced working surface. Brushes are secured to side faces of blades. Device has sub secured in its upper pair. Sub has pocket on its outer surface and seat for check valve. Device is used for cleaning of, particularly, casing string filter part from various salt deposits and viscous contaminating substances of resinous-paraffin type, and walls of uncased wells in the course of their construction, for instance, from clay crust. EFFECT: higher efficiency and productivity of pipe wall cleaning. 2 cl, 4 dwg