Patent ID: 8408307

Claim:
A method of drilling a wellbore and cleaning a wellbore casing, the method comprising the steps of: providing a drill string having a drill bit and a cleaning tool with selectively activatable cleaning members in the wellbore having the wellbore casing; drilling the wellbore further using the drill bit while maintaining the selectively activatable cleaning members in a deactivated position; activating the selectively activatable cleaning members by extending the selectively activatable cleaning members from the cleaning tool to contact an interior wall of the wellbore casing, wherein activating comprises biasing the cleaning members into contact with a wall of the wellbore casing by at least one of magnetic repulsion and dropping a ball through the drill string; pulling the drill string from the wellbore with the selectively activatable cleaning members in an activated position to thereby clean the wellbore casing; and deactivating the selectively activatable cleaning members after said selectively activatable cleaning members have cleaned a portion of the wellbore casing.