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Down hole tension/compression device for logging tools

  • US 6,557,631 B1
  • Filed: 10/26/2000
  • Issued: 05/06/2003
  • Est. Priority Date: 10/30/1999
  • Status: Expired due to Term
First Claim
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1. A self contained well hole logging tool comprising electronic apparatus for logging a well hole, said well hole having a drill pipe therein, wherein said logging tool includes normally open fluid flow valve structure, said valve structure being operable to close upon a differential movement of said drill pipe longitudinally to said logging tool and thereby to restrict flow of fluid through said valve structure to thereby restrict the flow of fluid within said drill pipe, thereby creating a back pressure within said drill pipe to provide an indication at the surface that the fogging tool is stuck in the hole.

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