Tool string transportation device

A device for transporting a tool string down a bore, the device comprising:

• a mandrel comprising a connection at one or both ends of the mandrel for inline connection of the device in the tool string;
• a collar rotationally mounted on the mandrel between the ends of the mandrel to rotate relative to the mandrel about a longitudinal axis of the tool string;
• a pair of wheels rotationally mounted to the collar to rotate relative to the mandrel on a rotational axis perpendicular to the longitudinal axis of the tool string;
• the device defining an outer form configured to orient the device in the bore during use so that the radial extremity of wheels contact a low side of a wall of the bore;
• and
• a locking mechanism moveable between a locked position and an unlocked position to lock and unlock the collar to the mandrel, in the locked position the locking mechanism fixes the outer form of the device at any desired angular orientation relative to the mandrel so that the outer form of the device orients the device and adjacent tool string section at the desired angular orientation in the bore during use.

A device for transporting a tool string down a bore, the device comprising:

• a mandrel comprising a connection at one or both ends of the mandrel for in-line connection of the device in the tool string, the connection at one or both ends of the mandrel comprising a connection thread;
• a pair of wheels mounted to rotate relative to the mandrel on a rotational axis perpendicular to a longitudinal axis of the tool string;
• the device defining an outer form configured to orient the device in the bore during use so that a radial extremity of the wheels contact a low side of a wall of the bore;
• an adjustment mechanism configured to provide for adjustment of an angular orientation of the outer form of the device relative to an adjacent tool string section;
• and
• a locking mechanism moveable between a locked position and an unlocked position to lock and unlock the adjustment mechanism, in the locked position the locking mechanism fixes the outer form of the device at any desired angular orientation relative to the adjacent tool string section so that the outer form of the device orients the device and adjacent tool string section at the desired angular orientation in the bore during use;
• wherein the adjustment mechanism comprises the connection thread, the connection thread providing for in-line connection to the adjacent tool string section and allowing the angular orientation of the device relative to the adjacent tool string section to be adjusted to any desired angular orientation;
• and
• wherein the connection thread has a thread length to provide for connection of the device to the adjacent tool string section and an adjustment thread length to allow for rotational adjustment between the device and the adjacent tool string section to set the angular orientation of the device relative to the adjacent tool string section.