While casing is run in to the drilled hole it is desired that casing string must be aligned with the center of the hole and casing can be rotated during cementing operations. This ensures placement of cement slurry uniformly around the casing for a good cement bond between casing and borehole. Autobahn Industries has and developed Model ABCU, ABCUL, ABSCB. Casing bushing to achieve these goals. Model ABSCB, is split bushing and is interchangeable with VARCO CB bushing. Model ABCUL & ABCU are solid bushing and are interchangeable with VARCO CUL & CU Bushings.
Different sizes of insert bowls are fitted in these bushings to lower many sizes of casing pipes.
