Drill Collar Top Companies
Workstrings International
Hunting PLC
National Oilwell Varco
International Drilling Services Ltd. (IDS)
American Oilfield Tools, Inc.
*Disclaimer: Top companies sorted in no particular order
Drill Collar Market Concentration
Drill Collar Company List
Hunting PLC
China Vigor Drilling Oil Tools and Equipment Co. Ltd
International Drilling Services Ltd (IDS)
Schoeller-Bleckmann Oilfield Equipment AG
National Oilwell Varco Inc. (NOV)
Schlumberger Limited
Zhong Yuan Special Steel Co. Ltd
American Oilfield Tools Inc.
Workstrings International
Texas Steel Conversion Inc. (TSC)
Challenger International Inc.
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