About Drill Collars Drill collars are an essential part of the drill string. They form the lowest component of the drill string. Drill collars are heavy, thick-walled steel pipes with threaded connections at both ends. The end with an external thread is known as the male end, whereas the end with an internal thread is known as the female end. The basic purpose of a drill collar is to provide the necessary weight for drilling purposes. Drill collars are machined out of solid steel bars as per API specifications. They are manufactured from standard steel (usually plain carbon steel) or a ...more >>
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