US Patent 11988050 Centralizer with opposing hollow spring structure

A centralizer for a downhole probe disposed within a pipe, the centralizer having an elongated, primary tubular member with two or more elongated centralizer strip assemblies extending along the primary tubular member. Each strip assembly has inner and outer hollow portions on the wall of the primary tubular member and spaced apart from one another about the circumference of the wall. The outer portion of each strip assembly comprises a flexible outer spring, and the inner portion of the strip assembly comprises a flexible inner spring. The inner portions of the strip assemblies engage the outer diameter of a probe and the outer portions of the strip assemblies engage the inner diameter of a pipe.