发明名称 |
DOWNHOLE TOOL |
摘要 |
A pressure control device for mounting on a mandrel includes a flexible cup member, a rigid support member and an anti extrusion portion of greater hardness than the cup member located at an outer portion of the cup member. The cup member is bonded only to selected areas of the anti extrusion portion and the support member, thereby permitting relative movement between other areas of contact.
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申请公布号 |
CA2484611(C) |
申请公布日期 |
2011.05.10 |
申请号 |
CA20042484611 |
申请日期 |
2004.10.08 |
申请人 |
RUBBERATKINS LIMITED |
发明人 |
ATKINS, NICHOLAS;EGLETON, PHILIP;SPALDING, CRAIG |
分类号 |
E21B47/06;E21B33/12;E21B33/126 |
主分类号 |
E21B47/06 |
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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