<p>A dart may include a foam body, a filtering material at least partially covering the form body, and a mandrel. the foam body may surround the mandrel.</p>
申请公布号
WO2010029283(A1)
申请公布日期
2010.03.18
申请号
WO2009GB02093
申请日期
2009.08.28
申请人
HALLIBURTON ENERGY SERVICES, INC.;JONES, DESMOND;SZARKA, DAVID, DURWARD;FEARS, BRETT, A.;WEBB, EARL;CURTIS, PHILIP, ANTHONY
