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Drill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralize...
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The wall thickness of heavy weight drill pipe is between drill pipe and drill collar, its structure is similar with drill pipe. It is made from premiu...
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Kellys is the driving section of the whole drill stem. Kelly is available with square kelly and hexagonal kelly. Kelly are manufactured strictly from ...
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NON-Magnetic Drill Collars are made from stainless alloy steel by combining a proprietary chemical analysis and a hammer forging process. The material...
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Spiral drill collar is used to reduce contact area with hole so as to avoid efficiently bit sticking from differential pressure. Spiral drill collars...
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