发明申请
US20100059228A1 Casing Wiping Dart With Filtering Layer 有权
套管擦拭飞溅与过滤层

Casing Wiping Dart With Filtering Layer
摘要:
A dart may include a foam body, a filtering material at least partially covering the foam body, and a mandrel. The foam body may surround the mandrel.
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