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The spiral drill collar
Aug 31, 2017

The spiral drill collar is made of three right-handed spiral grooves on the cylindrical surface of the circular drill collar. In the external thread joint part with a 305~560 mm, internal thread end joint part with a 457~610 mm processing spiral groove round drill collar, to facilitate loading and unloading operation and repairing. The weight is less than 4% of the round drill collar of the same size.

In directional drilling, because the inclined shaft is larger, the contact area between the drilling collar and the shaft lining is large, and the sticking and sticking drill is easier to occur. The spiral drill collar reduces the contact area with the shaft lining, so it has been widely adopted.

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