Abstract: An autonomous tool includes a tool body and turbine wheels coupled to the tool body. Each turbine wheel is retractable into the tool body and extendable out of the tool body. When the turbine wheels are extended out of the tool body, the axial axes of the turbine wheels can be positioned parallel to the axial axis of the tool body, allowing generation of mechanical energy from a fluid stream moving along the tool body, or positioned perpendicular to the axial axis of tool body, allowing the turbine wheels to roll along a tubular wall. Electrical generators are mechanically coupled to the turbine wheels to convert the mechanical energy produced by the turbine wheels into electrical energy. An energy storage stores the electrical energy for use by components of the tool.

Abstract: An autonomous tool includes a tool body and turbine wheels coupled to the tool body. Each turbine wheel is retractable into the tool body and extendable out of the tool body. When the turbine wheels are extended out of the tool body, the axial axes of the turbine wheels can be positioned parallel to the axial axis of the tool body, allowing generation of mechanical energy from a fluid stream moving along the tool body, or positioned perpendicular to the axial axis of tool body, allowing the turbine wheels to roll along a tubular wall. Electrical generators are mechanically coupled to the turbine wheels to convert the mechanical energy produced by the turbine wheels into electrical energy. An energy storage stores the electrical energy for use by components of the tool.

Abstract: A system and method for acoustically profiling a wellbore while drilling, and which identifies depths in the wellbore where the wellbore diameter is enlarged or has highly fractured sidewalls. These depths are identified based on monitoring either travel time or signal strength of acoustic signals that propagate axially in the wellbore. Correlating wellbore depth to travel time of a signal traveling downhole inside of a drill string and uphole outside of the drill string yields an average signal velocity in the wellbore. Depths having a lower average signal velocity indicate where the wellbore diameter is enlarged or has highly fractured sidewalls. These depths are also identified by generating separate acoustic signals inside and outside of the drill string, comparing signal strengths of signals reflected from the wellbore bottom, and identifying the depths based on where there is an offset in the strengths of the reflected signals.