发明名称 |
LARGE BORE AUTO-FILL FLOAT EQUIPMENT |
摘要 |
An auto-fill type float collar assembly is provided. The float collar assembly of the present invention has at least one curved flapper-style valve, preferably constructed of composite, non-metallic material. Each flapper of the present invention has a substantially 90° range of motion, and is closed via a torsion spring. Each flapper is held in the open (or “auto-fill”), position via an external shifting mechanism passing around, rather than through, the central flow bore of the assembly. A floatable actuation ball can be run with the tool, or pumped downhole, in order to selectively actuate the assembly and close the flappers when desired. |
申请公布号 |
EP2576958(A1) |
申请公布日期 |
2013.04.10 |
申请号 |
EP20110787227 |
申请日期 |
2011.05.24 |
申请人 |
BLACKHAWK SPECIALTY TOOLS, LLC |
发明人 |
GROESBECK, BRAD;ARCEMENT, JEFFREY;JORDAN, JOHN;MARTENS, JAMES |
分类号 |
E21B21/10;E21B34/00;E21B34/16 |
主分类号 |
E21B21/10 |
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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