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Coiled tubing apparatus

  • US 5,762,142 A
  • Filed: 02/05/1997
  • Issued: 06/09/1998
  • Est. Priority Date: 06/02/1995
  • Status: Expired due to Fees
First Claim
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1. A downhole tool assembly having a first portion and a second portion disconnectable from the first portion, and having a dual check valve assembly located primarily in the first portion of the tool assembly, the dual check valve assembly comprising:

  • a housing having a bore therethrough with first and second seats adjacent each end of said bore;

    first and second spheres disposed in said bore with a biasing member disposed therebetween for biasing said first sphere against said first seat and said second sphere towards said second seat;

    said second sphere having a projection thereon projecting through said bore adjacent said second seat and adapted for engagement with the second portion of the tool assembly;

    whereby fluid may flow through said bore adjacent said first seat then through said bore adjacent said second seat upon disposing the valve assembly within the first portion of the tool assembly and fluid is prevented from flowing through said bore upon said projection not engaging the second portion of the tool assembly allowing both spheres to be seated on said seats when the second portion of the tool assembly is disconnected from the first portion of the tool assembly.

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