发明名称 |
PACKOFF NIPPLE |
摘要 |
A packoff nipple for use on the mandrel of a wellhead isolation tool features a two step extrusion sealing arrangement activated by a primary element forcing the expansion of a packing ring to fill voids in the tubing or casing brought about by pipe erosion, corrosion, out of round or off center mandrel conditions. Extremely high pressures are sealed off from the wellhead. The packoff nipple sealing elements are protected from damage when running the nipple through restricted areas in the wellhead and the tubing or casing.
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申请公布号 |
CA2057219(C) |
申请公布日期 |
1994.11.22 |
申请号 |
CA19912057219 |
申请日期 |
1991.12.06 |
申请人 |
TREE SAVERS INTERNATIONAL LTD.;ROESCH ALBERT;TREE SAVERS INTERNATIONAL LTD |
发明人 |
MCLEOD, RODERICK D.;ROESCH, ALBERT |
分类号 |
E21B33/068;E21B33/126;(IPC1-7):E21B43/26 |
主分类号 |
E21B33/068 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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