| 摘要 |
A method for compactly placing a material such as gravel in a well bore exteriorly of a casing at a substantial depth by vibrating the stationary casing through the use of one or more devices positioned in the casing that are actuated by manipulation, rotation or reciprocation, of a drill pipe extending to the surface of the well. The device includes a member which is spring biased and movable relative to the drill pipe with a latch element for repeatedly biasing and releasing the member to impact the casing during continued manipulation of the drill pipe.
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