Specification :

Spiral drill collar
Spiral drill collars are manufactured three spiral groves on slick drill collar, which is used reduce contact area to avoid efficiently bit sticking form differential pressure.
Spiral drill collar is made of 4145H modified Cr Mo alloy steel, its technical parameter meet with API Spec-7 standard.
We can process elevator recess, slip recess and stress relief slot according to customer¡¯s requirement.
We provide thread protectors free.
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