Patent ID: 9140100
Filing Date: 2015-09-22
Classification: B08B,E21B

Abstract:
1. A device for cleaning a wellbore in a subterranean well, the wellbore having a wall, comprising: a tubular section having a bottom, at least two helical scratchers mounted thereon wherein said helical scratchers contain at least one helical blade fitted with flexible wires that are sufficiently long to touch the wellbore wall, characterized in that the helical scratchers are able to rotate axially to tubular section when a fluid flows axially to tubular section, and wherein the scratcher rotation is independent of tubular section movements, wherein the fluid flows out of the bottom of the tubular; wherein the two helical scratchers are connected through a cleaning wire; wherein the device further comprises a restoring aid connected on one side to the tubular section and on the other side on one of the helical scratchers; and wherein the restoring aid exerts force in a direction parallel to the tubular section.