| 摘要 |
<p>A well packer is shown of the type having a packer head and a pair of tubular extending downwardly therefrom. An upper seal, a gripping assembly, a lower seal and a lock body are all located about the mandrels extending successively downwardly from the packer head. An actuator within the lock body is provided for effecting outward radial movement of the seals and gripping assembly to seal and grip a surrounding well conduit. A push rod extending from the lock body through the lower seal to the gripping assembly moves the gripping assembly, as a unit, in the direction of the upper seal to compress the upper seal before the lower seal is compressed. A tie rod extends from the packer head through the upper seal to the gripping assembly and carries a locking mechanism which allows unidirectional movement of the gripping assembly with respect to the upper seal whereby sealing force applied to the upper seal from the gripping assembly is locked into the upper seal.</p> |
