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Downhole core barrel flushing system

  • US 4,356,872 A
  • Filed: 08/21/1980
  • Issued: 11/02/1982
  • Est. Priority Date: 08/21/1980
  • Status: Expired due to Term
First Claim
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1. A core barrel flushing device adapted for attachment to a drill string and a core barrel to be flushed under existing downhole core sample taking conditions and pressure comprising:

  • an outer barrel,an inner barrel within the outer barrel and having an internal passage for allowing drilling fluid to pass therethrough to the core barrel,a chamber of predetermined axial length and volume within the outer barrel and having an entrance end portion and an opposite exit end portion,a piston movable in the chamber, relative to the inner and outer barrels,a flushing medium of sufficient predetermined volume in the chamber between the piston and the exit end of the chamber,seal means at the entrance and exit end portions of the chamber adapted for sealing off the chamber, andactuating means for closing off the internal passage and flow of drilling fluid therethrough, providing an entrance passage for fluid under pressure to act upon and displace the piston, and an exit passage for the flushing medium displaced by the piston into and flush the core barrel downhole.

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