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 , 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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