JPS5638757B2 - |
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| 申请号 | JP13823273 | 申请日 | 1973-12-13 | 公开(公告)号 | JPS5638757B2 | 公开(公告)日 | 1981-09-08 |
| 申请人 | 发明人 | ||||||
| 摘要 | A full opening, annulus pressure responsive, formation testing method and apparatus wherein both valve closing and valve opening biasing forces are generated in response to annulus pressure and wherein a full opening, formation fluid flow passage is provided by the testing valve. A disabling mechanism may be employed which would be operable, in response to removal of the apparatus from a well bore, to vitiate an annulus pressure generated biasing force tending to urge the testing valve to a closed condition. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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