Drill Collar

  • Spiral Drill Collar

    Spiral Drill Collar

    Spiral Drill collar The major function of spiral drill collar: It is to prevent drilling tools from pressure differential block during drilling, the spiral groove allows the mud flow freely around the drill collar to balance pressure preventing pressure block, so effectively...Read More
  • API Drill Collar

    API Drill Collar

    API Drill Collar API Drill Collar , as the main component of BHA, is at the bottom of drill string. It has the features of thick wall thickness, great gravity, and stiffness. Regular API Drill Collar materials: 4145H or 4145H MOD Regular API Drill Collar is A type (Slick...Read More
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