Drilling jar

  • US 8,151,910 B2
  • Filed: 05/07/2009
  • Issued: 04/10/2012
  • Est. Priority Date: 05/07/2008
  • Status: Active Grant
First Claim
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1. A metering assembly for a drilling jar comprising a sliding assembly slideable within a barrel assembly, said barrel assembly having a restricted barrel segment defining an upper chamber and a lower chamber, a volume of fluid retained in said upper chamber, said lower chamber, and said restricted barrel segment;

  • said metering assembly comprising;

    an upper flange;

    a lower flange;

    a meter valve slideable between said upper flange and said lower flange;

    said upper flange, said lower flange, and said meter valve constructed to slide through said restricted barrel segment;

    at least one upper opening provided in said upper flange, wherein at least one of said at least one upper opening is constructed to allow fluid to flow there through;

    at least one lower opening provided in said lower flange, wherein at least one of said at least one lower opening is constructed to allow fluid to flow there through;

    wherein said upper chamber is larger than said lower chamber; and

    wherein said fluid retained in said upper chamber, restricted barrel segment, and lower chamber is compressible fluid.

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