发明名称 |
Seal assembly |
摘要 |
Disclosed is apparatus for sealing between two concentric annular surfaces whereby the sealing engagement may be disrupted in response to an excess pressure differential acting on the sealing apparatus in one axial direction sense. Elastic means restore the apparatus to its sealing configuration upon reduction of the pressure differential. Apparatus and method disclosed are particularly applicable to cementing liners in wells.
|
申请公布号 |
US4364432(A) |
申请公布日期 |
1982.12.21 |
申请号 |
US19800187383 |
申请日期 |
1980.09.15 |
申请人 |
HUGHES TOOL COMPANY |
发明人 |
BASS, C. JOE;PETERSON, ELMER R. |
分类号 |
E21B33/12;E21B33/16;E21B34/06;E21B34/12;E21B34/14;E21B41/00;E21B43/10;(IPC1-7):E21B23/04;E21B33/14 |
主分类号 |
E21B33/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|