| 摘要 |
<p>Device for anchoring a probe (1) in a well by the expanding, controlled remotely from the surface, of at least one anchoring arm (7) held in a closing position by a retractable bolt (24) engaged in a rod (17) connected to the anchoring arm by means of links (9, 11).
<??>The external pressure is exerted on the bolt (24) permanently (via the orifices 21, 21A), the bolt being fixed to a head (25) movable in a cavity (26). Means contained in an inner space (29) of the body make it possible to exert on the head (25) pressure proportional to the external pressure, thus keeping the bolt blocked in the rod (17), or a much lower pressure, with the result that the bolt is released.
<??>The invention is used, for example, in oil prospecting.
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