The Rebco BB Circulating Bottom Sub-Assembly is designed for use with both BF and BR Landing Nipples and covers seal bore sizes from 1.78" to 2.81". For use in a BF Landing Nipple, it is paired with Lock Mandrels ROTS, ROTW, ROTG, and ROTM, using an API Cross Over Mandrel or Packing Mandrel with a BB Seal Unit. For use in a BR Landing Nipple, it is paired with Lock Mandrels ROTZ and ROTK, again using an API Cross Over Mandrel or Packing Mandrel with a Type BB Seal Unit. The assembly holds pressure from below while allowing circulation from above, and can be held open to bypass fluid freely during run-in and pull-out operations, reducing the hydraulic resistance on the tool string while tripping in and out of the well.

The BB Circulating Bottom Sub-Assembly consists of eight components: a Seal Unit, an API Cross Over Mandrel, a Circulating Valve, a Valve Stem, two Springs, a Retainer, and a Type A or B Cage. Part numbers and full engineering data are referenced in Section XVI (Plug Chokes). When ordering, the operator must specify the Lock Mandrel size and type to be used, as well as the material suited to downhole conditions.

How to Order: Product Code 21. Specify Landing Nipple type (BF or BR), Lock Mandrel size and type to be used with (ROTS, ROTW, ROTG, ROTM for BF; ROTZ, ROTK for BR), Cage type (A or B), material, and service conditions. Refer to Section XVI for part numbers and engineering data.