Centralizer

A centralizer apparatus comprising

• a hollow tubular body with an exterior surface and a longitudinal bore therethrough,
• a first collar movably emplaced around the tubular body and movable longitudinally thereon,
• a plurality of spring bows, each spring bow having a first end spaced apart from a second end, each spring bow biased outwardly from the tubular body,
• a first groove in the exterior surface of the tubular body, the groove defined by a top side wall and a bottom side wall, and a middle wall therebetween,
• the first collar movably disposed in the groove,
• the first groove top side wall and bottom side wall limiting first collar movement,
• the first ends of the spring bows connected to the first collar, so that upon movement of the first collar in a direction away from the second ends of the spring bows the spring bows move inwardly toward the tubular body,
• a second collar movably emplaced around the tubular body and movable longitudinally thereon,
• the second ends of the spring bows connected to the second collar, so that upon movement of the second collar away from the first collar, the spring bows move inwardly toward the tubular body,
• a second groove in the exterior surface of the tubular body, the second groove defined by a top side wall and a bottom side wall, and a middle wall therebetween,
• the second collar movably disposed in the groove, and
• the second groove top side wall and bottom side wall limiting second collar movement.