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Product Category

Drill Collars

  1. Standard: API SPEC 7-1
  2. Material: 4145H
  3. OD:3-1/8"~11"
  4. Length: 30ft to 31 ft ± 6 ft.
  5. Application: as an important part of drill string, drill collar can supply the drill bit and increase the rigidity of drill string.
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TIANJIN RICHSEN OIL EQUIPMENT CO.,LTD is an OCTG Comprehensive solution provider based on China serving global market. 

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