Cementing plugs are semirigid barriers that separate cement slurry from drilling fluids, wipe the casing, and indicate when cement placement is complete. Plugs were once made of gunnysacks, wood, and leather. Present designs include top and bottom wiper cementing plugs constructed of nitrile or polyurethane molded over PDC drillable high-density plastic cores (Fig. 1). The … Continue reading Cementing plugs | Wiper Top & Bottom