Patent ID: 7096949

Claim:
A cementing wiper plug for sealing a wellbore having a casing, comprising: a plurality of radially extending, elastomeric wipers extending from the cementing wiper plug further comprising one or more substantially inflexible projections biased radially outward from the cementing wiper plug and angled uphole, wherein, the one or more projections are moveable inwardly sufficiently so as to permit movement downwardly into the casing and are sufficiently inflexible to engage the casing to prevent uphole movement of the cementing wiper plug in the casing; and an elastomeric packer element formed at a bottom of the cementing wiper plug, the packer element being actuable between an insertion diameter and an expanded diameter so as to engage the inside of the casing and seal the wellbore against leakage of fluids from below the cementing wiper plug when the elastomeric packer element is in the expanded diameter.