| 摘要 |
One or more brush bodies fabricated from an incompressible material, for example, from high density polyurethane, high density polyethylene, high density polypropylene, nylon, Orlon*, high density plastics, phenolic resin-based materials hard rubber, wood, aluminum, or other easily drillable metals, are connected to, or integrally fabricated with one or more elastomeric, conventional cement plugs, and are pumped down within the interior of oilfield casing situated within an earth borehole, to minimize or eliminate the need to run a workstring of drillpipe and drill bit to clean out the interior of the string of casing.
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