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Method and apparatus for measurement-while-drilling utilizing improved antennas

  • US 5,530,358 A
  • Filed: 01/25/1994
  • Issued: 06/25/1996
  • Est. Priority Date: 01/25/1994
  • Status: Expired due to Term
First Claim
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1. An antenna assembly for use in a wellbore for communicating electromagnetic energy, comprising:

  • an elongated member with an outer peripheral surface having a contoured portion including a plurality of discrete communication regions of reduced radial dimension and a plurality of land members having a radial dimension substantially equivalent to said outer peripheral surface of said elongated member, with said plurality of discrete communication regions and said plurality of land members being located to define a plurality of alternating groove and land portions;

    an antenna pathway defined in said elongated member substantially transverse to said plurality of alternating groove and land portions; and

    an antenna member at least partially disposed in said antenna pathway with portions of said antenna member extending out of said elongated member at said plurality of discrete communication regions to facilitate communication of said electromagnetic energy, and extending into said elongated member at said plurality of land members.

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