发明名称 Staging tool seal arrangement for gas wells
摘要 A staging tool arrangement for gas well production assistance, comprising an elongated staging tool having an elongated upper portion and an elongated lower portion. The upper portion has a sliding relationship with the lower portion thereof. A displaceable annular seal is arranged about the lower portion. A displaceable enclosure is arranged on the elongated lower portion so as to slidably expose and to slidably enclose the annular seal.
申请公布号 US8201629(B2) 申请公布日期 2012.06.19
申请号 US20090586736 申请日期 2009.09.25
申请人 GREEN DAVID A.;WELL MASTER CORP. 发明人 GREEN DAVID A.
分类号 E21B31/18;E21B23/00;E21B43/12 主分类号 E21B31/18
代理机构 代理人
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