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Reverse circulating tool

  • US 4,312,415 A
  • Filed: 05/01/1980
  • Issued: 01/26/1982
  • Est. Priority Date: 05/01/1980
  • Status: Expired due to Term
First Claim
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1. A device for reversing the flow of circulating fluid which comprises a cylindrical body, which has a flat upper surface and a flat lower surface, the flat upper surface and the flat lower surface being perpendicular to the central axis of the cylindrical body, a protrusion on the bottom of the cylindrical body, the central axis of the bottom protrusion generally lying on the central axis of the cylindrical body and the end of the bottom protrusion being externally threaded, the width of the bottom protrusion being less than the diameter of the cylindrical body, a protrusion on the top of the cylindrical body, the central axis of the top protrusion generally lying on the central axis of the cylindrical body, the width of the top protrusion being less than the diameter of the cylindrical body, a first passageway which lies generally on the central axis of the bottom protrusion and which extends through the cylindrical body to a site on the upper end surface of the cylindrical body located away from the interface of the cylindrical body and the top protrusion, and a second passageway which lies generally on the central axis of the top protrusion and which extends through the cylindrical body to a site on the lower end surface of the cylindrical body located away from the interface of the cylindrical body and the bottom protrusion, the end of the first passageway in the top protrusion being internally threaded, the first passageway and the second passageway not intersecting.

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