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COMPOSITE DRILL PIPE AND METHOD OF FORMING SAME

  • US 20090101328A1
  • Filed: 11/25/2008
  • Published: 04/23/2009
  • Est. Priority Date: 09/28/2004
  • Status: Abandoned Application
First Claim
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1. A drill pipe string forming a metal to composite interface, comprising:

  • a plurality of longitudinally aligned filament wound composite pipe segments configured at their respective opposite extremities with tapered sections formed by cylindrical walls tapering distally to thin annular edges;

    pairs of male and female couplers interposed between adjacent ends of respective pipe segments including inner and outer concentric cylindrical members formed by respective outer and inner walls, the respective walls formed with respective confronting bonding surfaces angling distally in one direction in conical fashion away from one another to cooperate in forming conical nesting cavities for complementary receipt of the respective tapered sections of the adjacent pipe segments of said string;

    a bond bonding the pipe segment walls to the male and female couplers; and

    said male and female couplers including respective threaded male nipples and female openings for screwable connection of respective adjacent male and female couplers together.

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