Hydraulically driven rotating string reamer and methods

A method for operating a drill string in a wellbore, the method comprising:

• providing a drilling apparatus comprising a Kelly drive system for rotating the drill string relative to the wellbore;
• making up the drill string comprising a bottom hole assembly and a Kelly that engages with a Kelly bushing of the Kelly drive system at a surface of the wellbore, the bottom hole assembly comprising:
• a drill bit coupled to a downhole end of the bottom hole assembly;
• a near-bit reamer coupled to the drill string uphole from the drill bit;
• and
• a hydraulically driven rotating string reamer assembly comprising:
• a rotating string reamer coupled to the drill string uphole from the near-bit reamer and the drill bit;
• and
• a hydraulic drive disposed uphole of the rotating string reamer, wherein the hydraulic drive is operatively coupled to an uphole end of the rotating string reamer;
• translating the bottom hole assembly axially through the wellbore;
• while translating the bottom hole assembly axially through the wellbore, producing a flow of drilling fluid through the drill string, where:
• the flow of drilling fluid through the drill string causes the hydraulic drive to rotate the rotating string reamer relative to the drill string, the drill bit, and the near-bit reamer;
• and
• rotation of the rotating string reamer relative to the drill string, drill bit, and near-bit reamer reams away imperfections extending radially inward from a wellbore wall of the wellbore;
• translating the drill string axially through the wellbore in an uphole direction without producing the flow of drilling fluid through the drill string;
• detecting an overpull condition of the drill string while translating the drill string axially through the wellbore;
• and
• in response to detecting the overpull condition, circulating the drilling fluid through the drill string to produce the flow of drilling fluid through the drill string, where the flow of drilling fluid causes the hydraulically driven rotating string reamer assembly to rotate relative to the drill string and drill bit to remove at least a portion of protruding imperfections from an inner surface of the wellbore.