发明名称 |
HYDRAULIC PORT COLLAR |
摘要 |
A stage valve with particular use in cementing a well bore annulus above an inflatable packer located in a well bore on a liner where the stage valve has pressure operated outer sleeve members for opening a flow port in the stage valve and an inner sleeve member actuated by the trailing plug behind a liquid cement slurry to close the flow port whereupon spring members act on at least one of the outer sleeve members to close off the flow port on the exterior of the stage valve.
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申请公布号 |
CA2121636(C) |
申请公布日期 |
2004.09.21 |
申请号 |
CA19942121636 |
申请日期 |
1994.04.19 |
申请人 |
CTC INTERNATIONAL, CORPORATION |
发明人 |
BROOKS, ROBERT T. |
分类号 |
E21B33/127;E21B33/14;E21B34/10;(IPC1-7):E21B33/13;E21B33/126;E21B34/00 |
主分类号 |
E21B33/127 |
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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