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Method and apparatus for taking an undisturbed core sample

  • US 5,253,720 A
  • Filed: 06/13/1991
  • Issued: 10/19/1993
  • Est. Priority Date: 06/13/1991
  • Status: Expired due to Fees
First Claim
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1. A formation core sampling apparatus for a subterranean well where fluids are found, comprising:

  • a housing;

    core barrel means selectively movable with respect to said housing by fluid pressure, from a retracted position to facilitate placement of an end of said housing into the formation to an extended position for obtaining a formation specimen in said core barrel;

    sealing means releasably mounted to said core barrel means for isolating the fluids in the well from said core barrel means as said core barrel means is selectively moved into the formation, in its movement from said retracted to said extended position.

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  • 4 Assignments
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